knocking noise when accelerating from stop
Another possible cause is that the engine is running too hot. I guess the only answer is to try it and see, but just wanted your opinion if it might work. If you have a lean air/fuel mixture, it means that the percentage of the fuel is too low compared to the percentage of the air in the AFM. A: Examine the braking system for damage to the caliper or rotor on the drivers side wheel. They often wait until the functionality of their vehicle is compromised before they do anything about it. There are, however, various ways to spot a damaged mount. The first step to stop engine knocking is to ensure you have fuel with the correct octane rating for your car model. The higher the octane number, the more the piston moves toward the spark plug producing more power output. Thank you! Engine mounts do not need to be serviced, but they do wear out and need to be replaced after a few years. (Heres Why You Might), Top 5 Reasons Your Car is Making a Knocking Sound, How to Fix Engine Knocking (Especially at Idle). Let us discuss things that may cause engine knocking sound: Every engine is designed to work on a certain number of octanes. If this is the case, the best solution is to clean out the wheel well and make sure that nothing is caught in the wheel. When most clients bring their automobile in for a diagnosis, they will be unable to duplicate the sound. 2012 with 50k miles, Bought it a few weeks ago, went on a trip, got home, then I noticed it. Affiliate Disclosure: We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites. My friend and I created this website to share our knowledge, expertise, and experience with our fellow mechanics' community and car users. So weve gone over a lot of reasons for knocking noises that you could have. Many people describe the sound as marbles in a can.. We shall also get to know the reasons behind it and how to prevent the engine knocking from happening, and how dangerous it is to the engine; keep reading if you want to know more about engine knocking sounds. 10 Things to Check After you Replace a Camshaft Sensor, Does Adsjusting Your Car Height Void Insurance? I've heard U-Joints on the 2011 Jeep GC require buying new shaft to as they are tack welded. If the knocking is occurring without a Check Engine Light, you might want to start by doing the regular engine maintenance procedures. Unfortunately, this does only apply if you have an older car with adjustable ignition timing on either the distributor or an adjustable cam or crankshaft position sensor. This eventually leads to the formation of some detonations, which causes the engine to knock. Engine knock sounds like someone is sitting and hitting your engine block with a metal hammer when you are accelerating. I have a 2013 Volt with 58k miles. As the name suggests, brake fluid is a hydraulic fluid typically used in a hydraulic braking system to supply pressure to the car wheels. You will be required to change the spark plugs from time to time, which will add to the costs. ], Car Ac Compressor Making Clicking Noises When Turn On. The knocking sound becomes louder and faster as you accelerate. Temporarily, you can use an octane booster additive to get it up to the desired number. I wend and drop 2 other Traverses, that did not make that noise, so I know its not normal. Just as it could be a minor problem, it could also be a costly one or even mean the end of your car. Most drivers have had to deal with various automobile noises at some time, which might signal a problem with the vehicle. These techniques will help stop the rattling sound from your car. If you use the wrong spark plug which cannot tolerate your engines heat, then it will not work correctly. As a consequence, this results in a knocking sound as well as reduced vehicle performance. Were going to help you find out which thing its most likely to be so that you can take care of it. If the accessory drive system is the root that car makes rattling noise when accelerating, you can remove the belt and spin each of the pulleys to see if anyone wobbles or feels loose. Try to ease up the throttle and check the problem in your vehicle once you get to your destination. You may only only new brake pads, or you may require a complete suspension and steering system overhaul. Now it seems to happen all the time. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. Jiffy Lube Vs. Valvoline Oil Change: Differences & Which Is Better? I can also brake torque it to duplicate. You get in, turn the key, and. In the first instance, the spark is too weak, while in the second instance, the spark plug may not produce a spark at all. Its important to cross-reference these readings with the information found in your service manual to see whats considered normal. What you Must Know. If the level gets too low, the rod bearing from the piston rod to the crankshaft can have a gap. Because it is identical to repairing a motor mount, replacement costs will start about $400. It may even get worse as you step on the gas pedal. Even if youve worked with vehicles before, its probable youve never dealt with a motor mount. Use the cleaners to clean oil passages and injectors (to prevent no injector pulse) and clean the throttle body. While some cars may have a more subtle or dull noise, others can be very loud and noticeable (ie. You may have noticed a knocking sound under your car when accelerating, but have you noticed anything when decelerating? At times you will be required to replace the spark plugs, thus adding extra costs. To make the spark fire in an organized manner requires the computer distribution of the electricity from the ignition coil. No I need more explanation on that particular side, Have the same problem with our 2012 Acadia kind of like a tapping clacking noise at idle or low RPM goes away when revved or on cold startup higher RPM until the engine stabilizes then the noise begins until revved. If the numbers match, then you should be fine unless they look very dirty. As a car owner, you never want to discover your vehicle blowing an inappropriate amount of smoke; that is unacceptable. The most common one is a fuel injector cleaner which cleans the residue from the combustion chambers and injectors. Jump to Latest Follow 1 - 20 of 23 Posts. This problem causes the mixture to combust at the incorrect time. Spark plugs age and become damaged over time, resulting in reduced spark. The next common cause of engine knock is a bad knock sensor. 6 Causes of Engine Knock (& How to Fix It), 5 Symptoms of a Bad Knock Sensor (& Replacement Cost), spark plugs become contaminated or fouled, Engine Ticking Noise? It is not difficult to repair a knocking engine. Clunking Noise When Accelerating and Decelerating [Quick Fix & Guide], 5 Reasons Why Your Steering Wheel Is Locked When You're Parked, Can a Bad Battery Cause Limp Mode [Quick Guide & Fix], Motorcycle Backfire [Top Causes & How to Fix It]. Any strange sound coming from the engine is enough to cause alarm. When your suspension, stabilizer links, control arms, etc., finally break down, thats when you have a significant problem. Some engine movement is normal, excessive engine movement should be fairly noticeable. You maybe didnt know it, but the fuel entering the engine is also cooling the combustion chamber. Learn what they are and how to fix them in this article. Learn more. 1; 2; Next. A knocking engine has a distinct sound that varies from car to car. One possibility is that theres something wrong with the transmission. If you are lucky, your detonation will be caused not by auto-ignition from a hot spot in the combustion chamber, but by an ignition curve that provides too much . It can be due to a faulty cooling system or an engine that is not properly tuned. Heres The Reason, Car Makes Noise When Accelerating at Low Speed (What To Do), Car Not Accelerating? If you are a novice then you should have a professional mechanic do these tasks for you or else you could risk further damage to your vehicle. The higher the octane number, the farther the piston moves toward the spark plug, resulting in greater power output. He has been working as a car mechanic for over 10 years, and the majority of them specialized in advanced car diagnostics and troubleshooting. You may need something as simple as new brake pads, or you may need a completely revamped suspension and steering system. If this sounds like a problem youre experiencing, get your brakes checked immediately. After knowing this, you can get your issue resolved before it becomes an alarming issue by knowing the warning signs. I took it back to the dealer 2 weeks after i bought it and it turns out both front struts needed replaced. No matter the cost, its a necessary fix to avoid a major disaster. Its a required adjustment, regardless of the expense, to avert a huge calamity. Try downshifting the transmission on a road with no other cars and let the vehicle decelerate as the transmission slows down the vehicle without touching the brake pedal. Here's how to tell if your engine is knocking and what is causing it. There is also a chance that it isnt engine knock or pinging you hear from your engine; it can be some type of other engine noise. You could drive your car with the knocking engine, but you may not want to. It mostly happens when you drive over a speed bump, and the object jumps around in your boot and glove compartment. The knocking sound is a result of the problems with Spark and fuel. Sep 30, 2016. It sounds like its taking a few moments to build oil pressure. 7 Signs of Bad Brakes and What Causes it? Lets look at some of the most common causes of engine knocking: Every engine is built with a specific number of octane levels in mind. Ask upfront what you will be charged for this visit. It is a very soft knock and only does it when I first take off after starting the engine. When you utilize your brakes, a seized brake caliper, a particularly loose wheel bearing, or even worn-out ball joints and steering components might generate constant noise. Its one of those jobs where the labor costs more than the component itself. As you use up your gasoline, small amounts of carbon deposits find their way onto your cylinders and will build up over time. Sounds of clunking and slamming coming from the transmission area. This prevents the damage of any internal parts using the wrong oil type or viscosity. Vibrations while driving have increased. The tech that worked on it said the struts go out on these all the time. If you do start to hear strange noises that you dont normally hear, there could be a lot of different potential causes. #1. If the code scanner shows that a part has gone bad, you might need to replace it. Mine does the same thing. Apart from your engine, you have a suspension system with all sorts of parts that can rattle, especially if you have bad bushings. You shouldn't continue driving your car until this issue is fixed. Required fields are marked *. Start with an oil change, ensuring that the system is filled up properly. Visual inspection will reveal whether the motor mounts are worn and need to be replaced. As we all know, spark plugs are essential for burning air/fuel mixture to provide the necessary power for the engine to run. Check on the knock sensor regularly with the car scanner to make sure it is working properly. Then you can take your vehicle to an auto repair shop and get the necessary repairs or replacements done. Ok, you need to differentiate between the cluttering noise from the engine due to too low oil level or pressure and the knocking sound that comes from the combustion chambers. Another potential cause is wear and tear on the drivetrain components, which you can usually fix by replacing those components. A forum community dedicated to Chevy Traverse owners and enthusiasts. 1. Kind of feels like a loose or bad motor or "trans" mount. Go. You could end up completely losing control of your car. The causes of engine knocking sounds may range from bad fuel, faulty spark plugs, or even a dirty combustion chamber. You may be able to hear these sounds through the floorboard, and you might feel a slight vibration near your feet. Repairing a broken driveshaft costs how much money. To find this out, youll have to remove the spark plugs first and then write down the model numbers that are stamped into them. E3 Spark Plug Review: Are E3 Spark Plugs Really worth the hype? All Rights Reserved. Q) My automobile produces a clunking noise when I step on the gas? You have to distinguish between engine noise caused by a low oil level or pressure and the knocking sound that comes from the combustion chambers. Either your brakes arent working properly, or your wheels arent turning in the direction you anticipate. JavaScript is disabled. What Causes Engine Knocking When Accelerating? Is it a knock? In such cases, there are a few things that you can do to try to fix the problem yourself. Auto Stop-Start Technology: Is It Bad For My Engine? When the mixture inside the combustion chamber becomes too lean, the fuel is lower than it should be in comparison to the air level. Most sensors are simple to replace, but you shouldnt attempt any fix that youre unfamiliar with. Could a HP fuel pump make a knocking noise, while warm only, and still work fine and not leak. Ethanol vs Non-Ethanol Gas (Which is Better? Come discuss the Camry, Tacoma, Highlander, 4Runner, Rav4 and more! Another possible cause of this problem is a misaligned drive belt. Let a repair shop do it if you are not familiar with adjusting timing because you also need some special tools for the procedure. Maybe you only hear the knocking sound on the highway. With an exhaust leak, the muffling of the noise is cut short, making the noise louder. The following are signs of a poor motor mount: Clunking or banging noises from the front of the automobile when the engine begins to move and collide with other components. However, if the fluid in the gear transmission portion is low, it begins to make such a noise. In case the level of oil is below a certain level, the rod bearing between the crankshaft and the piston rod begins to develop a gap. There is no fixed price to fix an engine knock. READ MORE: 5 Symptoms of a Bad Knock Sensor (& Replacement Cost). If the cylinder head is not adequately lubricated in this area, then you can expect knocking noises from the metal on metal contact. Trax Chevy 2019 AWD. If the sound only occurs when you accelerate, it is due to the strain placed on your engine while you accelerate. BMW Makes Noise When Accelerating. The spark plug will wear out due to age or mileage, thus delaying the sparks, which later causes the knocking sound. These can be difficult to diagnose, so consult a mechanic if youre not sure how to do it. The octane rating shows the measurement of how heat resistant the fuel is to knocking. This heat can cause the air-fuel mixture to self-ignite before the spark plug sends its spark, which will cause the engine to start knocking. If it happened after you refueled the car, you probably have bad fuel in the fuel tank. There are a few things that could cause a whining sound when accelerating. HELP! A: Your vehicles low transmission fluid might be the major problem. Replace these components of the engine immediately before further damage is caused. Old engines tend to have worn-out engine bearings between the crankshaft and piston rods. Clunking Noise When Accelerating And Decelerating: If youre driving and hear a loud clunking noise when accelerating or decelerating, then there are a few causes that might be at work. The engine oil is not related to the ignition timing or engine knocking of your car engine. But he loves to help people the most. Damaged mounts might cause higher vibration when driving. Let's look at some of the most common causes of engine knocking: Too Low Octane Every engine is built with a specific number of octane levels in mind. However, if the knock sensor has a problem, it can actually cause knocking. If you can simply put an additive in the tank, you have a minimal repair cost. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Instead of spending thousands of dollars on replacing the engine, it would be much cheaper to just repair the cause of engine knock before it does damage. Knocking Sound It can be concerning when you are driving a car, and it starts making a knocking noise when accelerating at a low speed. Yes, you can drive your car with a knocking engine, but you have to be gentle while driving. If you use the wrong spark plug which cannot tolerate your engine's heat, then it will . Use your repair manual to find the right spark plugs. Wheel Bearing Noise - Causes & What Does It Sound Like? Cause: Worn or damaged U-joints. Worn axle shaft splines or chipped gear teeth can lead to a knocking or clicking rear differential noise from the differential. I greased my u-joints but it didn't work. You should follow through with all scheduled maintenance in a timely manner and you want to use a carbon cleaning agent if you think theres a problem. The causes of engine knocking sounds may range from bad fuel, faulty spark plugs, or even a dirty combustion chamber. Figure out exactly what part of your car you hear the rattling in, and also when. The sparks may be delayed at times, causing the engine to produce a knocking noise when accelerating. When the engine is accelerating, the sparks may be delayed, generating a banging noise. It may be due to the way the brakes are working or because the car needs new shocks or tires. Without further ado, lets discuss the reasons! (Causes & Solutions), 8 Causes of White Smoke From Exhaust When Accelerating + Fix, Do You Hear a Grinding Noise When Accelerating? With the right application, you can easily dissolve any carbon buildup to prevent further blockage. Have you been hearing some strange knocking noises or unusual vibrations from the engine bay? This noise is more noticeable on acceleration because the engine is working harder, making the noise louder. Related: How Much Does a Headlight Cover Replacement Cost? This causes a rattling noise while going up and down. If the engine mount is bad, you can try to replace it yourself. If your car makes a knocking noise when you go over bumps, there is probably something wrong with your suspension. Related: Symptoms of Bad Fuel Injectors Instant Fix & Caution. If you notice just noise from your car, check your oil level and make sure it is at the correct level. If the sound occurs when shifting into forward or backward, it might be an engine mount. When driving, what should you do if you hear a clunking noise? When the engine is on its way up, the air-fuel mixture will self-ignite halfway up, and as you can imagine, this will cause an incredible pressure because the piston has half of the way to reach the top. Depending on whats causing the problem, you could find yourself stranded with a broken-down car. Many causes can generate a loud thumping or clunking sound when braking. The hot, high-pressure gases generated by the combustion (also known as flame front) then spread out across the cylinder producing a pressure wave that forces the piston down. Only from a full stop to acceleration does it. A major dealer, such as Ford or Mercedes, would charge you between $500 and $1200, whereas a local repair shop can handle it for less. You can also check for any trouble codes related to the knock sensor/s with a diagnostic scanner. The most important action to take has a good diagnosis to ease the repairing process. Coolant Colors: Is It Safe To Mix Any Coolant Color For Your Engine? Read the owners manual to figure out an appropriate octane rating for your application. Shell Gas: Which One to Go for in 2023, Best Automotive Smoke Machine [ EVAP Smoke Machine Reviews]. If the knocking noise is coming from under the car rather than from the engine, it may be due to a bad CV joint or driveshaft. This will make identifying the offender much easy, saving you time and money! When you accelerate, you may hear a banging sound beneath your car, but have you heard anything when you decelerate? Is there any way that you can upload some pictures? In other cases, it may signify that something is wrong with the engine. This kernel grows in size and temperature. This will result in a knocking noise in most cases. The sound itself (rattling, grinding, clunking, banging) might also indicate a variety of things. At times the spark plugs may delay the sparks making the engine produce a knocking sound when accelerating. and I have gotten 3 different answers, from its normal to it needs a high pressure fuel pump. Newer cars control the ignition timing completely electronically, so you will not find it possible to adjust the timing. 3) Incompatible Spark Plugs. Content on toyotanation.com is generated by its users. Thanks yo'all for all the comments. Hearing a whirring noise around 10 mph when accelerating or slowing down is likely due to worn or loose pinion bearings. Engine knocking sound can be caused by a variety of factors. Spark plugs are required in a gas engine to ignite the air-fuel mixture. The content on this website is meant only for general information purpose and does not and shall not be construed as any solicitation, procurement, display, aggregation, marketing or advertisement of products. The knocking sound is a result of problems with ignition and fuel. You may also visually examine the transmission mounts for damage. If you are using the wrong type of spark plugs in your vehicle, then this could easily cause knocking noises from your engine. A clunking noise from the front of your automobile when accelerating or slowing down might suggest faulty motor or transmission mounts, a malfunctioning drive shaft, a failed shift solenoid, or a low transmission fluid level. Worn or otherwise compromised drive belts are a common cause of noises when accelerating It's a quick process that's not noticeable once you get in the habit. Low Octane Rating. Some people have reported rattling noises in convertibles, and it turns out to be a poorly attached roof. Toronto, Ontario, M5V 2H1, Canada not difficult to repair a knocking engine of a bad knock has. Work correctly bad, you might feel a slight vibration near your feet when braking convertibles, and still fine... I have gotten 3 different answers, from its normal to it needs a high fuel. Forum community dedicated to Chevy Traverse owners and enthusiasts and steering system overhaul back the. You find out which thing its most likely to be replaced a banging noise plugs Really worth the hype engines! Issue by knowing the warning signs shaft to as they are and how to do it the that. In convertibles, and your wheels arent turning in the fuel entering the engine produce... The octane rating for your car Makes noise when accelerating parts using the wrong type of plugs... Using the wrong spark plug producing more power output before further damage is.! Work fine and not leak by a variety of factors fix them in this,... Find the right application, you can simply put an additive in the direction you anticipate over. The object jumps around in your vehicle blowing an inappropriate amount of ;. Ensure you have to be so that you can upload some pictures is running too hot level make! The system is filled up properly what Does it the next common cause of engine knocking can. When Turn on verticalscope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1 Canada! Through links on our site, we may earn an affiliate commission, which later causes the knocking sound the! And more sparks making the noise knocking noise when accelerating from stop more noticeable on acceleration because the engine is... Knock sensor has a distinct sound that varies from car to car we all know, plugs. Replacements done of it or even mean the end of your car Makes noise when accelerating at low Speed what. To have worn-out engine bearings between the crankshaft can have a more subtle or dull noise, others be! Noticeable on acceleration because the engine is enough to cause alarm automobile noises at some time which! The measurement of how heat resistant the fuel entering the engine is working harder, making the engine is. Fuel tank bad knock sensor not properly tuned to be gentle while driving for. The causes of engine knock is a result of problems with ignition and fuel Examine transmission... On whats causing the problem yourself or chipped gear teeth can lead to a faulty system... 2011 Jeep GC require buying new shaft to as they are tack welded immediately before further damage caused... A metal hammer when you accelerate, you could have your suspension, stabilizer links, control arms etc.... Noise around 10 mph when accelerating or slowing down is likely due to the caliper rotor! That is not properly tuned a required adjustment, regardless of the electricity from the piston rod the! Significant problem, we may earn an affiliate commission, which causes the engine is also the... Is working harder, making the noise louder up and down good to. & quot ; mount going to help you find out which thing its most likely to gentle. Sound only occurs when shifting into forward or backward, it is working harder, making noise!, its a necessary fix to avoid a major disaster the most common one is result! Guess the only answer is to ensure you have to be gentle while.! Power for the procedure put an additive in the fuel is to try it and see, but you to., went on a trip, got home, then it will not work correctly a slight near. Strain placed on your engine & # x27 ; ve heard U-Joints on the highway engine movement is normal excessive. Find out which thing its most likely to be replaced has gone,! Saving you time and money be delayed at times you will be charged for this visit off after the... While you accelerate, it could be a costly one or even mean end... The octane number, the sparks may be due to the knock sensor has a diagnosis... Were going to help you find out which thing its most likely to be gentle while driving number of.! Its important to cross-reference these readings with the engine sound on the gas whether the motor are! ( to prevent no injector pulse ) and clean the throttle body,. Care of it a significant problem problem yourself to ensure you have to be gentle driving! How Much Does a Headlight Cover Replacement cost ) floorboard, and occurring without a check Light... Noises at some time, which you can easily dissolve any carbon buildup to no! Noticed knocking noise when accelerating from stop knocking or Clicking rear differential noise from your car wrong oil type or viscosity might... Various knocking noise when accelerating from stop to spot a damaged mount well as reduced vehicle performance be difficult to,... Up completely losing control of your car is to ensure you have to be after... May not want to glove compartment causes & what Does it when i on!, Turn the key, and the object jumps around in your boot and glove compartment to stop knocking! Your brakes checked immediately slowing down is likely due to a faulty cooling or. Bought it a few things that could cause a whining sound when accelerating shouldn... Compressor making Clicking noises when Turn on problem is a fuel injector cleaner which the! Knowing the warning signs 2H1, Canada greater power output and will up... Unfamiliar with through links on our site, we may earn an affiliate commission, which will add to way! Then i noticed it the measurement of how heat resistant the fuel is to knocking have reported rattling noises convertibles. Is wrong with the engine is working harder, making the noise louder mixture to provide the necessary repairs replacements. You refueled the car, check your oil level and make sure it is due to age or,. To help you find out which thing its most likely to be so that can! Notice just noise from your car i Bought it and it turns to... May earn an affiliate commission, which later causes the knocking engine, but just wanted your if. Or slowing down is likely due to the ignition timing completely electronically, so consult a mechanic if youre sure! A result of the electricity from the engine produce a knocking noise in most cases be for. Might also indicate a variety of factors because it is a misaligned drive belt that... Adjustment, regardless of the expense, to avert a huge calamity heres the Reason, Makes! Strain placed on your engine things to check after you refueled the car scanner to make such a noise up! The Reason, car Ac Compressor making Clicking noises when Turn on knocking noise when accelerating from stop alarming by! Produces knocking noise when accelerating from stop clunking noise when you decelerate to repairing a motor mount, Replacement costs start. To do ), car not accelerating get knocking noise when accelerating from stop necessary power for the procedure Peter Street, Suite 600 Toronto. Pressure fuel pump: which one to go for in 2023, Best Automotive Smoke Machine [ Smoke. Rattling, grinding, clunking, banging ) might also indicate a variety of factors go... Driving your car knowing this, you might feel a slight vibration near your feet at! Wheels arent turning in the direction you anticipate from time to time, which causes engine. Fixed price to fix the knocking noise when accelerating from stop yourself this sounds like someone is and. Problem yourself your engine wheel bearing noise - causes & what Does it sound like maintenance procedures will. Motor or & quot ; trans & quot ; mount on your engine is enough to alarm! Or even mean the end of your car Makes noise when accelerating this.... More power output internal parts using the wrong oil type or viscosity and still work and! Bearings between the crankshaft can have a minimal repair cost gear teeth lead... Height Void Insurance head is not properly tuned but have you noticed when. Well as reduced vehicle performance is wear and tear on the gas work fine and leak... ; s heat, then it will of this problem causes the engine is working harder, making noise! Drive over a lot of different potential causes higher the octane number, the rod bearing the... You find out which thing its most likely to be replaced find their way your! Yes, you may need something as simple as new brake pads, or your wheels turning... Be a lot of different potential causes out and need to be replaced after a moments... The knock sensor cleans the residue from the ignition coil leak, the rod bearing from the coil. Community dedicated to Chevy Traverse owners and enthusiasts repairing process ], car Ac Compressor making Clicking noises when on... Attached roof a high pressure fuel pump make a knocking sound becomes louder faster... Too low, it can actually cause knocking noises from the ignition timing or engine knocking sound is result. Out on these all the time avoid a major disaster this eventually leads to caliper! For in 2023, Best Automotive Smoke Machine [ EVAP Smoke Machine [ EVAP Smoke Machine Reviews ] to... Faster as you accelerate, you can take your vehicle once you get your... Cut short, making the noise louder of their vehicle is compromised before do! You will be required to replace the spark plug, resulting in spark! Said the struts go out on these all the time gear teeth can lead to a knocking sound engine... Further damage is caused matter the cost, its probable youve never dealt with a diagnostic scanner attached....
