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Date: Mon, 13 May 2002 16:08:58 GMT
From: leenopsamamenigma-it.com (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"
<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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