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Old 12-09-2012, 07:43 PM   #1 (permalink)
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Default clunk while cranking

This started about 2 months ago. Every once in a while I'll turn the key and the car cranks for a sec and then there's a clunk and it stops cranking for about a quarter to a half a sec and then cranks again and starts up. Its a Stealth SOHC ATX runs and drives perfectly.

I did some googling and read something about a starter chipping the teeth off a flywheel and thought that this could be a similar situation. Anyone have any ideas?
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Old 12-09-2012, 10:30 PM   #2 (permalink)
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Default Re: clunk while cranking

If the fly wheel had teeth missing I would think it would do the same thing every time you went to start it, or more often then not. But you said it does it every once and a while. How often ....few times a week, month, year? Does the starter still make a noise during the brief second it "stops cranking"? Or does the engine completely stop rotating?
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Old 12-10-2012, 02:15 AM   #3 (permalink)
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Default Re: clunk while cranking

SO pull the cover and look at the teeth. Its very likely there are soe missing from your description.

-SP
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Old 12-10-2012, 09:35 AM   #4 (permalink)
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Default Re: clunk while cranking

One or 2 times per week, and the engine completely stops rotating after the clunk
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Old 12-11-2012, 05:23 AM   #5 (permalink)
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Default Re: clunk while cranking

runs perfect but engine clunks and stops rotating while cranking then resumes cranking.
mrrrrrrfffff, thinking its a misfire forcing a reverse rotation scenario during compression cycle..

check cap and rotor for carbon tracking and wires picking up an induction spark by running right next to each other.
maybe an uber rich slow burn or head gasket leaking between cylinders but neither one of those goes with "runs and drives perfectly".

missing teeth or loose starter bolts should give you a "zing" sound.

luck
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Old 12-11-2012, 07:28 PM   #6 (permalink)
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Default Re: clunk while cranking

I'd verify the ignition timing.
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Old 12-11-2012, 08:09 PM   #7 (permalink)
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Default Re: clunk while cranking

Refresh my memory, is it these cars that ran off CAS but started off CPS signals?
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Old 12-16-2012, 01:48 PM   #8 (permalink)
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Default Re: clunk while cranking

Quote:
Originally Posted by Grandpa Poser View Post
runs perfect but engine clunks and stops rotating while cranking then resumes cranking.
mrrrrrrfffff, thinking its a misfire forcing a reverse rotation scenario during compression cycle..

check cap and rotor for carbon tracking and wires picking up an induction spark by running right next to each other.
maybe an uber rich slow burn or head gasket leaking between cylinders but neither one of those goes with "runs and drives perfectly".

missing teeth or loose starter bolts should give you a "zing" sound.

luck
I checked the distributor cap and cleaned the rotor and the contacts. There was 1 contact that had a thick layer of corrosion on it, the rest of them and the rotor was a little dirty too, I cleaned them up and the car is running a little quieter and it hasn't had that clunk since.
-Thanks
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Old 12-16-2012, 10:45 PM   #9 (permalink)
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Default Re: clunk while cranking

welcome, sometimes it's the simple things.
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