Knocking Noise behind engine, - Team Camaro Tech
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post #1 of 6 (permalink) Old Jan 29th, 03, 05:45 PM Thread Starter
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latley ive been hearing this odd knocking sound , i hear it while in the car, it sounds like its coming from the rear of the engine, it only does it while im stopped at a light and sometimes idling, its making the sound of a fan hitting the shroud, but it isnt that. any ideas what it could be? or where i should look?

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post #2 of 6 (permalink) Old Jan 29th, 03, 08:34 PM
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from the rear of the engine for sure? if it's and auto, check the flexplate and torque converter bolts. also, check the flexplate to see if it's cracked. can't hurt to make sure the bellhousing bolts are tight. look for anything that is flopping around loose back there.

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post #3 of 6 (permalink) Old Jan 30th, 03, 08:38 PM
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Had a simular problem once. I had a rock in my bell housing and it would catch the teeth of my flex plate when I was idling. Once I was moving it must have spun with the converter so the noise would go away. Take a look
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post #4 of 6 (permalink) Old Jan 31st, 03, 02:31 PM
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A buddy had a junk four wheel drive Suburban with a 350/TH350 in it and he had to put a couple of flexplates in it over time b/c they cracked and made a sound like you are describing.

Hope not, but might check into it.... pdq67

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post #5 of 6 (permalink) Old Feb 2nd, 03, 08:26 PM
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Tough question. Don't see any mention of trans type but for jokes I'll ask if thats a loose fan shroud or one screwed down tight. Me and all of my wonderous experiences.
Could be a clutch throw out bearing or even lifter sticking. Try the old wooden dowl/stick to the ear and placing it on areas to check for the noise being transmitted up the shaft. Don't poke your head with the engine shakings around.
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post #6 of 6 (permalink) Old Feb 3rd, 03, 05:14 PM
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I second the flexplate/torque converter thing. I'd check the bolts first, then look at the flexplate where it bolts to the crank. This can be hard to see anything. I used a little dental mirror and a halogen light, spinning the flexplate with a prybar, and found 2 small cracks coming out from a bolt hole.
This was giving me a clicking noise, but only under light acceleration.
It could very well be what the others have mentioned too.

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