Date: Mon, 13 May 2002 16:08:58 GMT
From: (Lee Marshall)
Subject: Re: My dealer hasn't got a clue, can you help? ('97 9000 Aero, Manual)

On Mon, 13 May 2002 08:27:34 +0100, "Andrew Hookins" <> wrote: >Lee, > >Yes I was more or less repeating meme meme... > >Is the over-boost protection fuel cut-off mechanism active >when the over-boosting occurs? If you're not getting fuel >cut-off then this would suggest MAP sensor to me. I am only getting what feels like fuel cut off (it feels like you have just hit a brick wall) once the boost has gone past the end of the gauge. > >If there is a leak in the hose to the MAP sensor that only >opens under high boost then most of the time fuel metering >will be correct, but would tend to lean out in this over-boost >condition (BAD). If the MAP sensor is faulty who knows >what is happening to the fuel metering. The MAP sensor >_could_ be just be reporting a reduced pressure or may >simply stick at some arbitrary level and not report higher >pressures. In any event, I think that a problem here would >allow over boost conditions without fuel cut-off. > >If there is a leak between the APC solenoid and wastegate >actuator then fuel metering won't be affected. If the problem >is here then you would get over-boost rapidly followed by >very obvious fuel cut-off. That would be it then. Where in the engine bay would I find the pipe between the APC Solenoid and the wastegate actuator? I presume one end would be on the turbo? Where is the APC Solenoid? > >AndyH > Thanks for your in-depth help!

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