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Question

My 993 (1995) occasionally has a slight hesitation when starting from a cold start if I depress the accelerator too fast when upshifting. It will also backfire through the airbox if I really depress it fast. This lasts for about two miles, then it settles down with no further problems. Could this be weather related?

Submitted: 79 days and 11 hours ago.
Category: Car
Value: $23
Status: CLOSED
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Optional Information

Year: 1995
Make: Porsche
Model: 993 Carrera
Engine: 3.6 flat 6, aircooled

Already Tried:
Added fuel system additives. Replaced spark plugs. Replaced air cleaner with K&N air cleaner.

Accepted Answer

Hi,
That sounds like a sticking lifter, that will give you the hesitation and the popping.
An exaust valve lifter will make it pop through the air box.

Did you put a thick oil or oil additive in, your oil will be thick on cold start and if you
have a bad lifter, when the oil is warmer it is not as thick and will get to the lifter
more easily.

I would have the lifters checked before starting the engine when cold to see it that is
the problem.

Steve

Picture
Expert: Steve
Pos. Feedback: 91.9 %
Accepts: 
Answered: 9/4/2009

Mechanic Wide Ranging

22yrs Auto,Truck,Tractor Trailer,Heavy Equipment, Industrial Truck,Forklift,Motor Coach,Tour Bus

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