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Old 08-26-2004, 01:09   #1 (permalink)
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Grinding Noise?

I just had my c4 rebuilt with a stage 2 shift kit, transmission cooler and 2000rpm hi stall. Anyway i got the car back about a month ago and have run it in for about 1000km's. Took it back to the mechanic today for him to check over it and it's all good. So i'm driving home from work pull up at a set of lights and decide to see how it goes. It went pretty good, but then i heard some loud grinding noise or like metal hitting against metal. Since i got my car back from being done, occasionally when i start it up there is this same noise. When driving normally it doesn't do it, only seems to be on start up and as i found out today hard acceleration. Any idea's what it might be? the starter motor?
Hopefully it's nothing too serious cause i'm starting to get frustrated with problem after problem lately.
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Old 08-26-2004, 07:38   #2 (permalink)
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Re: Grinding Noise?

A cracked clutch pack assembly cylinder can cause this symptom; you'll know soon enough if so as it will get worse and you will get clutch slippage (lack of drive).
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Old 08-26-2004, 07:45   #3 (permalink)
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Re: Grinding Noise?

bolts come loose on converter/flexplate? also could be unis or input shaft , its hard to tell with noises, sounds travell away from problem, ask my wheel bearings.
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Old 08-26-2004, 16:32   #4 (permalink)
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Re: Grinding Noise?

I took it back to the mechanic this morning and he thinks the starter motor is damaged and when i take off hard the ring gear is slipping back causing the noise. I'm guessing and hoping this makes sense cause regular driving is fine, and my auto feels really good.
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Old 08-26-2004, 17:38   #5 (permalink)
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Re: Grinding Noise?

Do you mean when starting the engine or moving off from being stopped, such as at lights or whatever?
If the noise is when moving off from being stopped, the noise could be a universal, as someone suggested.
A dry uni often makes a lot more noise under load when accelerating than when cruising.
Best to drop the tailshaft out to check them properly.
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Old 08-26-2004, 18:09   #6 (permalink)
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Re: Grinding Noise?

Ok when starting, it will occasionally make the noise. When i put my foot in off the lights is when it starts aswell. I can be driving reasonably hard at times and it doesn't make any noise. It's definately a noise from the front of the car though.
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Old 08-26-2004, 18:43   #7 (permalink)
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Re: Grinding Noise?

grab the harmonic balancer and pull/push. might have to much end float, make sure engine is off and keys are out of car LOL
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