P38 Talking To Me

awillemsen · Sep 7, 2010

2001 4.6 Vogue, about 85k miles.

When cold, car sort of groans under acceleration, especially when revs are low (< 2000). Better when warm or hot, but still there. Also, slight vibration through foot rest.

Out on the dual carriageway, car is virtually silent at a steady 60mph, but if you accelerate or decelerate again it emits a sort of groaning sound. Not very loud, and the wife hasn't even noticed it! But maybe I just have better ears

No other symptoms, and it doesn't seem to be getting worse, but any noise that just appears starts getting me worried

Any ideas? Or should I just book her in (again)...?

Datatek · Sep 7, 2010

Probably comes from the wife thinking about the petrol you are consuming when you accelarate:behindsofa:
Oh and:welcome2: to the mad house.

Hamster97 · Sep 7, 2010

Trouble with having 8 cylinders is that if there is a misfire on 1, it is almost masked by the remaining 7. You might be off on a pot, who knows, probably best to get it looked at.

roddy4 · Sep 7, 2010

awillemsen said:
2001 4.6 Vogue, about 85k miles.

When cold, car sort of groans under acceleration, especially when revs are low (< 2000). Better when warm or hot, but still there. Also, slight vibration through foot rest.

Out on the dual carriageway, car is virtually silent at a steady 60mph, but if you accelerate or decelerate again it emits a sort of groaning sound. Not very loud, and the wife hasn't even noticed it! But maybe I just have better ears

No other symptoms, and it doesn't seem to be getting worse, but any noise that just appears starts getting me worried

Any ideas? Or should I just book her in (again)...?

try it without the wife lol,no seriously,could be the start of big end failure,or look at engine mounts,check oil level.

awillemsen · Sep 8, 2010

Thanks for the replies.

It has had a diagnostic check since the "groaning" started, and the only thing reported was running lean on both banks - which was sorted with a new air mass sensor. Would a misfire show up on the diagnostics?

Oil level is fine - not using any, even though there is a slight oil leak on the left bank. No knocking or rumbling noises either.

Are there any points in the transmission that would cause more noise during acceleration and deceleration than when keeping speed constant?

Thanks!

P.S. Passed its MoT this morning with no advisories!!

P38 Talking To Me

awillemsen

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Datatek

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Hamster97

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roddy4

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awillemsen

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