Re: Funny MAP behaviour in Audi 200...

[Orin Eman <orin@wolfenet.com>]

> As the past 2 weeks I've noticed that if I let the car
> coast and let the MAP reading drop it will go down to
> 0.0 bar. At idle it is showing 0.3 bar. Not all the
> time though, mostly when warm, other times still shows
> 0.4 bar at idle and 0.1 under deceleration.

> Probably not a biggey, but to me it is just another little
> niggling fault to show on this 200.

> I'd like some ideas on what to go and check? Manifold
> leak? Throttle valve problem? Vacuum line problem to ECU?
> Couldn't be something like severe blow-by past the rings,
> could it? (Sorry, what do I know, so might as well ask :) )

None of the above.  Vacuum leaks etc, if they had any visible effect
at all on this reading, would cause the reading to be higher.

Perhaps your pressure sensor is beat up from overboosting and
reading low... or maybe it's just the guage being goofy.
Get a mechanical guage, plumb it in at the computer and post
your readings.  That would give us a better idea.

Orin.