Quote:
Originally Posted by gabedrummin
Miss-fire gone .I went to reconnect injector and said to myself check the colors of the wire going to the injectors and low an behold I had connector 4 and 5 on the wrong injector .Durametric showing no misfires .Roughness indicator is flat lined ...So it looks like I'm to blame for this problem .What I don't understand is why was the software only showing one cylinder misfiring? So I'm going to put the car back together and se if it dis when coming to a stop. So The scenario is accelerate rapidly stop rapidly idle drops below normal and car dies ?
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Some OBDII systems will shut fuel injectors off under certain misfire conditions.
The feature is designed to protect the Catalytic converter.
So then they do not show misfires for that cyl.
I do not know if Porsche of the early era's like ours does this or not.
Doubtful but possible.
Info on the more advanced workings of the Porsche ECU's is very limited
Crossed injector wires would explain the backfire through the intake.
I bet if you do a "PROPER" LOL vacuum test now your numbers will be improved.