A4 engine revs

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Emoor - 28 Sep 2005 21:10 GMT

My 1994 manual Audi A4 1.8 has just developed a problem - The engine revs
at park constantly fluctuate between 1500 rpm and 3500 rpm approx. When i
try to drive the revs rise to to no more than 3500 rpm and then die away to
1500 rpm, meaning i cannot accelerate. This ocurs in each gear. The AA
man suspected an air flow meter and/or engine management fault. Has
anybody any ideas on the cause of the fault?

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Iain Miller - 28 Sep 2005 23:11 GMT

> My 1994 manual Audi A4 1.8 has just developed a problem - The engine revs
> at park constantly fluctuate between 1500 rpm and 3500 rpm approx. When i
[quoted text clipped - 3 lines]
> man suspected an air flow meter and/or engine management fault. Has
> anybody any ideas on the cause of the fault?

Could be a lot of things....

Might be a sensor problem of some kind. Also could be a vacuum leak.
Suggest you start by checking vaccum hoses & looking for splits etc. You
might also try cleaning the throttle body. A MAF sensor would be a likely
candidate as these do have a habit of failing & would be a good place to
start - not the cheapest thing in the word though.

Its less likely that the EM system itself is at fault, more that its being
fed duff information.

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Emoor - 29 Sep 2005 22:12 GMT

Thanks very much for the feedback, I will have a check of the hoses and
throttle body.

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