When you have it in your hands look for a redish powder in a line. Excessive crankshaft flange runout or end plate can also cause flexplate cracking. And no, i cannot see anything with the inspection cover off. Pulled the transmission inspection plate off to peak at the flex plate.
If its a rod knock the knock will go away when you kill the cylinder. I did not know this at the time i bought it as it was the first time in a long time owning an automatic, so all of my flexplate and torque converter knowledge have come from the last year of owning the blazer. Pull lower pan, check rod movement,or remove bearing cap. I have the same kind of knocking noise but i know what the problem is. My chevy started this tick noise out of now where thought about it and yea its the flex plate. Next day try to start it, sounded like a weak battery or starter but car started. If the noise goes away with water flooding the bellhousingthen you have a cracked flex plate. It stalls at lights while in gear with brakes applied after it warms up and there is a knock that is in what sounds like the t. Then, it happened loud knock knock knock from the engine.
It makes a bad vibration at about 2k, but not specifically a rattle knock. Slowed to idle and pulled off into a business parking lot. It will sound almost like an engine knock but will be heard. If its a rod knock then while listening with your stethoscope pull one plug wire at a time sliding a test light down between the plug wire and boot also works. The problem turned out to be a cracked flex plate which. Fontverdanaim leaning towards a cracked flex plate being the culprit not sure what could have led to a cracked flexplate, but very happy, to say the least, that its not the engine. Ok, so i replaced my flexplate 290,000 miles to see if that eliminated the lower end noise in my engine. Flex plate may have a pingclang noise when accelerating and decelerating. In neutral, brake on, rev engine slightly and note noise.
Symptoms of a cracked flexplate general discussion. Looks like there is a access panel to access the bolts that bolt the torque coverter and flywheel together. Well i checked torque converter bolts for loosemess and they were fine no sighns of cracked flex plate what so ever im gonna pop off the valve cover as i had it running and drove it up on ramps the knocking noise even under a load could hardley hear it and the longer i had it running the quitter it got that doesnt sound like a rod or main or piston sounds more like a calapsed lifter. Go to a good engine rebuilder and he will be spot on with a diagnosis. A bad flex plate usually has failed due to either damage or wear and tear, so replacement with a new flex plate is the only solution. Its possible the rear exhaust manifold or even the crossover pipe cracked and developed a leak. Your just not gonna see everything from peeking through that lower cover. Give a guess in the comments section and stay tuned for pt. And we also have heavyduty and sfiapproved flexplates for highhorsepower, highrpm race applications. If you have an automatic transmission, you have a flex plate, and it is a possiblity, and it can be checked without. How to check a knock sensor for continuity it still runs. My freind who is a mechanic says he is almost certain that its the flywheel. At idle there is a faint almost rod knock type sound from the torque converter flexplate area.
Jeep grand cherokee questions is it common for a loose. All of the teeth look fine and i cant see any cracks in the flexplate. From what ive gathered, that is the noise of a cracked flexplate. I would assume it would envolve unbolting trans and moving it back.
Start your vehicle as normal, but pay particular attention to the noise of the starter while it spins and engages the flexplate, or torque converter if your vehicle does not have a toothed flex plate. Is there anyway to check the flywheel torque converter without pulling the engine. The failure of this sensor would create a no start condition or would shut the truck off as you were driving. Near the beginning of the video when the van is idling in gear, that noise you hear that sounds like engine knock or marbles in a tin can is what mine is doing. The classic and most obvious symptom of a cracked flexplate involves the sound it. If it is the flex plate could be cracked and that too can sound like a rod knock. I cracked two flexplates on a 350 olds i drove balls out all the time, until i threw away the torque converter and got a good one. I was told by several people it could be a cracked flex plate.
I believe it is a cracked flexplate because i have a vibration when converter locks. The reason for the sound involves the flexplate s location and its function. Under load the noise is the most pronounced between 2k3k rpm. Slight misalignment may only cause a single flexplate to break in the life of the vehicle.
This may occur in worn engines or engine that have been poorly rebuilt. Interesting part now is that the knock is very prominent on any acceleration and constant load. Jeep grand cherokee questions is it common for a loose flex plate. It didnt fix the noise but now when i start the truck it. Why is the flywheel making a knocking noise as well as the. Descriptions of the sound include clanking, chirping and a light knocking. I hadnt removed the inspection plate yet to see if i had a broken tq converter bolt or a cracked flex plate. Apr 10, 2012 if the flex plate is cracked it should make noise like a lower end knock. Remove the inspection cover from the driver side of the bell housing see if the converter is loose. Jun 26, 2008 difference is a flywheel is used for a manual transmission. Chevrolet silverado 1500 questions loud knocking noise 5. Check the heat shield for any looseness and tighten it if necessary. Sometimes the flex plate will crack and as a result it can cause noise.
Proposed the issue was the flex plate rather then the engine. I was told that a small crack in the flexplate could mimic the sound of rod knock or piston slap. If youre foot is out of the accelerator pedal and the car is coasting, there is no knock. What can i do to troubleshoot this aside from dropping the trans and inspecting. I did not remove the starter and check for loose bolts because i wanted to check with you guys again about that inspection cover. Discussion in wrangler tj 19962006 started by krisryanl, may 5. Did a log, no st or lt knock i have a pretty conservative tune.
The knock sensor within your vehicle is a component designed to listen for engine detonation, or knocking. Take the inspection plate off and turn the engine by hand to check the flywheel. I turned the flexplate by prying with a screwdriver in between the teeth. Loose torque converter bolts and cracked flex plates. Sometimes you can actually get a little movement of the flywheel just before the torque converter moves. Cracked flex plate after it heats up, metal expands, will quiet down slightly. The plates usually crack around the crank like the picture shown, but those rusty streaks arent aways there.
Weve had a few forum members get broken flex plates in the last few years. Check out these reasons you could be hearing an engine rattling noise and what you can expect for repairs with these engine problems and diagnosis. When they crack near the crank flange, they sound rodknockish. To really check your flex plate youve gotta take it out. Come to think of it, its a good idea to also check the flex plate for cracks. Either will give a ticking knocking noise, more so on accel and when cold. I developed a loud knock at the flexplate tq area i got under there to check for cracks or anything unusual, couldnt see anything, so i unbolted the tq from the flexplate and pushed the tq back, turned the engine on and the knock completely disappeared. Because the flex plate is an integral part of your cars powertrain, and replacing it involves removing the transmission, a significant amount of labor will be involved. Flywheel will cause a jumpjerk when releasing clutch. If smoke is escaping from the oil fill hole it is very likely to be piston slap from wear or a broken skirt. A cracked flexplate is almost always a sign of other problems.
If it really is the flex plate, thats a lot cheaper than other problems that could cause a bad knock. This videos shows investigation into tightening the flex plate which i did and the noise came back after a few. Bad knock on engine people say flex plate on 1979 gmc 350. Loud knocking sound from torque converter or flywheel.
Most of the cracked flexplates ive heard sound worst at idle. A loose bolt will hollow out the hole, and can cause a crack from the hole toward the middle real hard to see. A lifter going bad will have more of a tap, tap, sound and the noise can be located on the top of the engine. There are tough flexplatesand there are chuck norriscaliber flexplates. Feb 05, 2011 i would check and make sure you are not missing the alignment dowells for the bellhousing bolts to the engine. Spark knock usually happens at idle and smooths out when youre driving, but the condition is. A rod knock can be made to repeatedly occur by revving the engine to 2,000 rpm and quickly releasing the throttle. Cracked flexplate on your 1998 ford escort automatic. I have seen a bunch where motor was pulled for said rod knock and broken flex plate was found. Weve got tough yet affordable flexplates for stock and mildly modified street vehicles. The sound is very similar to a bad connecting rod and is often misdiagnosed. More severe misalignment can break a flexplate in 15,000 to 30,000 miles. Oct 17, 2016 sometimes the flex plate could be cracked, making the same sounds and vibrations.
Oil pressure is good, 45 at idle up to 75 at 4500 rpm. The knock sensor is a crucial part of the engine, as detonation is harmful to the engine. Clicking this will make more experts see the question and we will remind you when it gets answered. The first signs were visible when i removed the dust cover and turned the engine over. Sounds like rod knock maintenancerepairs car talk community. The flexplate takes the place of the flywheel on automatic transmission vehicles. It bolts to the end of the crankshaft and attaches to the torque converter. Im not getting that weird creaking noise he gets on acceleration. When a flexplate cracks, it often produces a loud knocking noise as it rotates. Injector knock or cracked flex plate diagnosis w 2009 chevrolet duramax lmm dually. If the tachometer doesnt move, the cps is probably bad. In this video i talk about a noise coming between the engine and transmission. Cracked flexplate how can i tell the chrysler minivan. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplate s movement will create a noise.
My engine is vibrating and making a knocking sound at idl. Hey all, just recently picked up a 92 sonoma with a 4. I have not grounded out any plug wires to test for rod knock yet. How to know if a flexplate is warped it still runs. An easy way to diagnose a failed cps is to check for tach movement when you crank the engine over.
Jeep grand cherokee questions is it common for a loose flex. Thats why i spent time to really listen deep to your video to really hear what the problem is. The knock occurs at idle when the engine is warm and anytime the engine is under load. Start the engine, put in drive, foot on the brake, give it some rpm, does that quiet the noise loose bolts and cracked flex will usually be less noise doing that. If you get in to the engine hard, the knock goes away.
Hope this helps and maybe check out this site for a gift to send a special someone. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. The flex plate is a steel plate that bolts to the rear of the engine and has gear teeth. Flex plate of a 2012 dodge grand caravan this is a known problem for these vans, causes an awful metal knocking sound when idling and up to around 1,000 rpm. I packed up and headed inside without being able to crawl under and check the plate. The water stabilizes the flex plate and lubes the crack. A loose bolt on a flexplate or a crack between its bolt holes. Cracked flexplates arent as rare on these vans as they are on other cars. A loose manual flywheel will cause a knock, so will a cracked flexplate, and the aforementioned cracked piston skirt, all will cause a knock sounding very similar to a rod. If not properly diagnosed it will occur again and often damage to the transmission may follow. Might want to be ready for some water spray too with this test. Shut it down and got a tow the rest of the way home.
I checked oil pressure, pulled spark plug boots while truck was running but no. If you have checked for rod knock, checked flywheel, adjusted lifters, and still have the knock, what is left to check. Well, 2 flex plates later he figured out what was causing the problem. Flex plate of a 2012 dodge grand caravan this is a known. When i bought my m1009 it had a cracked flywheel and was making the typical rubbing sound when in reverse. Well i checked torque converter bolts for loosemess and they were fine no sighns of cracked flex plate what so ever im gonna pop. Discussion in engine topic started by purple81, may 10. As a result, this can cause the flexplate to wobble. First check your flywheel bolts,as the noise can be transferred. To me it sounded like a mad woodpecker somewhere under the truck. Check the flex plate flywheel for cracks or loose torque convertor bolts. Notice if the starter has a low, medium or highpitched whine while spinning.
I developed a loud knock at the flexplatetq area i got under there to check for cracks or anything unusual, couldnt see anything, so i unbolted the tq from the flexplate and pushed the tq back, turned the engine on and the knock completely disappeared. But with a crack flex plate if you press and hold the brake pedel and step on the gas pedel just a little the noise goes away with a rod knock the noise. Check yours if you develop a knock, grind or rattle in the bottom of the engine. Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. It makes a bad vibration at about 2k, but not specifically a rattleknock. Mine cracked between two of the large holes not the bolt holes. Cracked flexplate on your 1998 ford escort automatic transmission you were wondering if anyone knew. So if you have a knocking noise and an automatic transmission, its a good idea to check the torque converter bolts to see if theyre tight. Does cracked flex plate makes nocking noise answers. One of the other mechanics i work with forgot to transfer them over to a new tranny on a car once and it came back in 300 miles with a cracked flex plate. I had posted a similar question when i first got my vehicle around sep. The sound is very similar to a bad engine rod and is often misdiagnosed.
If you happen to have a manual transmission, this does not apply. The reason for the sound involves the flexplates location and its function. Noise in my chevrolet silverado sounds like flywheel. Put the front of the car up on jackstands, take the inspection cover off, turn the crank with a large ratchet and check out all the flexplate boltsturn the crank clockwise at all times. I thought i had a rod knock, but had perfect oil pressure and the noise sounds.