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MPDano,
The AAV you have there is only used on 16V motors, 85+ USA and 87+ ROW cars use something completely different. He has a 91 GT, nothing to do with the engine is the same as yours.
IcedT,
First off what part of Canada are you in?
The issues you describe do not sound like a brain failure, or a bad relay as you can keep it running with holding the throttle open.
As well it is unlikely to be the TPS that is causing the engine to stall as if the idle loop doesnt engage then it doesnt return to idle very fast. The fact that it idles high at 1600RPM is enough of a reason to check it though.
I would disconnect the LH brain and check the manual for the pin out. I would then find out/confirm that your TPS is activating with a DVM. Once you confirm this have a helper hold the throttle wide open and verify that your WOT part of the TPS is working too.
Your stalling issue, and the high idle issue sounds like a bad ISV though. This requires the intake to be removed. However this part is controlled by the LH which can have some funny failure modes. Due to this I would recommend finding someone in your area with a 87+ car and putting your brains into their car and seeing if their car has the same symptoms. Then put their brains in your car and see if that changes anything. If it does not then remove the intake replace the ISV, TPS (if it doesnt check out), knock sensors, and gaskets. This job runs around $1k in parts and you may want to have the intake powdercoated while off. You may consider though replacing the TempII at the same time or before just for ****s and giggles as it is a very cheap part.
The other thing which there is a faint chance of it being is the Reference sensor on the engine these have funny failures. But if it is this and you continue to live with it, it will get worse and not restart at times.
If you live on the west coast pm me privately and I can add you to our emailing list and there are a ton of guys who will let you swap the brains around.
Normy,
He has already put the hammer on his car, the Porsche dealership will not be able to do any more for him except rack up a very large bill trying to find the problem.
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