964 hesitation
#1
8th Gear
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Hi guys I need help with a 1990 964 C2 Coupe.I rebuilt the engine with all new pistons etc.Car does not leak a drop runs really good,but here is the problem,at idle the car runs perfect but starts to hesitate when I mash the throttle only after it warms up.When I had the engine out I put in a new head temp sensor.I checked the fuel press and was loosing pressure after you shut down the engine,I changed the reg and fuel press is good now.The car used to be hard to start when it was hot.That problem cured.But the hesitation problem is still there,the weird thing is when I drive the car it runs good with no hesitation.Its only when the car is stationary.I know this is not right.I do not pull up any codes at all.I,am using durametric software,and I checked the software by disconecting the o2 wire and it came as a code so I know the software works.The coils are both new also the coil wires.I happen to have a new AFL sitting around and switched it and still the same problem.The ox sensor is new.The idle speed valve is good.I tried a new relay still the same thing.I did try to put a jumper wire the 7 and 3 termial and the car would not start.I am completey at empty at this point I do not know what it could be any suggestions would be greatly appreciated.Captek
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Hi yes I check it ok.Its strange the car runs so well at idle pulls upno codes and it doesnt hesitate when driving just at a stop. I have checked and rechecked everything I,am at a loss.
#7
Burning Brakes
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your issue sounds like mine. i describe it as poor throttle response. at idle when you stab the throttle it takes too much time to respond right?
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Hi thats exactly how mine runs takes too long to respond.Checked the connector to the AFM looks good.Mine only does it when it is warm and i have a new temp sensor in the car.
#10
Burning Brakes
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yeah mine gets progressively worse the warmer it is. it's really snappy when cold.
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Too much fuel?
I know the turbo is different technology, but after my service the garage set it slightly richer than before (but still within Porsche recommendations) and it felt like a very heavy flywheel from idle up. Leaned the idle mixture and its a miracle... responsive again.
I know the turbo is different technology, but after my service the garage set it slightly richer than before (but still within Porsche recommendations) and it felt like a very heavy flywheel from idle up. Leaned the idle mixture and its a miracle... responsive again.
#13
Burning Brakes
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well it's worth a try. i assumed it was too lean