Date: Mon, 13 May 2002 23:20:50 +0100
From: "Toby Field" <tobyfieldnopsamail.com>
Subject: Re: My dealer hasn't got a clue, can you help? ('97 9000 Aero, Manual)


Have they replaced the Boost Pressure Control Valve (BPC). Mine used to cut and then come back suddenly. That's what was wrong with mine. -- Toby Field (UK) '93 9000 CSE 2.3T Auto 151,000 Miles "Lee Marshall" <leenopsamamenigma-it.com> wrote in message news:3cdfe374.251152998nopsam.nildram.co.uk... > On Mon, 13 May 2002 08:27:34 +0100, "Andrew Hookins" > <andrew.hookinsnopsamamnopsamodata.co.uk> 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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