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Loud knocking sound / different symptoms!
Yesterday my 986 2.5L started to knock from the back / (subjectively right side).
Symptoms: - audible only if in gear and moving - NOT happening when cruising on neutral - NOT happening / stops to knock when clutch is presed - NOT happening immediately from start, only when car warms up - more audible when climbing a steep hill - I can also hear very similar sound but not so loud when I lower the right side of the car from being jacked up. Visual inspection shows no rattle or damage on CV axle joints, I have old bushings (140k mileage), but I don't think they would hit so loud. It sounds somewhat like someone hitting wood with a hammer somewhere in the distance, but with force. |
yes, also: knocking is synced with wheel rotation. Same speed of knocks when in 1st, 2nd, or 3rd gear but the car moving at same speed.
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Bad universal joint on the rear axle.
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Where is it located and what to look for when inspecting it?
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In your original post you stated " Visual inspection shows no rattle or damage on CV axle joints " please explain exactly what you did or what this means . The axle universal joint mentioned above is the same thing as the CV axle joints . Usually but not always the first sign is the CV joint rubber bellows/covers are torn and throwing grease in the wheelwell or under the chassis . But a CV joint can be bad and still have good bellows . Classic symptom is a clicking or knocking noise as the axles rotate .
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I'm changing the "coffin arms" with bushings next week, will buy an axle joint from a dead 986 I found nearby to have it in the trunk when I'm doing the bushings. I'll remove the CVs and examine them.
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