Intermittent Stall

[c95975]

1999 996 c2 coupe 6 speed 140K

 

I have had a stalling problem for about 6 months and 2,000 miles. The engine will stall 1-3 seconds and then fire back up again. It only happens when the car has been run for a couple of hours. It has happened while stopped although mostly while rolling. No codes are flashed and no lights come on when the engine dies. I have had the fuel pressure checked at the rails and it is good. Any ideas?

[JFP in PA]

17 minutes ago, c95975 said:

1999 996 c2 coupe 6 speed 140K

 

I have had a stalling problem for about 6 months and 2,000 miles. The engine will stall 1-3 seconds and then fire back up again. It only happens when the car has been run for a couple of hours. It has happened while stopped although mostly while rolling. No codes are flashed and no lights come on when the engine dies. I have had the fuel pressure checked at the rails and it is good. Any ideas?

Welcome to RennTech

Check your crank position sensor, if it intermittently stops working when warm, the DME thinks the engine is not turning and shuts everything off.

[DBJoe996]

Just because you have fuel pressure at the rails doesn't mean you are getting full fuel flow.  A 99 C2 has a fuel filter and at your mileage it should have been replaced already.  Also agree on the CPS.  Both of these issues will not throw a CEL code because they are not emission related faults.  Might also consider the fuel pressure regulator.  If it is weak or stuck it will bleed off pressure when the engine is hot.

Edited March 20, 2019 by DBJoe996

[Mgraham49]

22 hours ago, c95975 said:

1999 996 c2 coupe 6 speed 140K

 

I have had a stalling problem for about 6 months and 2,000 miles. The engine will stall 1-3 seconds and then fire back up again. It only happens when the car has been run for a couple of hours. It has happened while stopped although mostly while rolling. No codes are flashed and no lights come on when the engine dies. I have had the fuel pressure checked at the rails and it is good. Any ideas?

1999 996 c2 6 speed, 105k on chassis, about 70k on engine. 

 

I don’t know if helpful, but after replacing the engine (bought w blown engine), I had a stall problem when steadily but not aggressively accelerating on the highway, the engine would die, I could coast with clutch in, then restart by reengaging. I am told throwing all sorts of unexplainable codes. Was two problems, bad crank sensor, and ultimately a frayed shorting wiring harness that after replacing with one off a different engine, cured the problem. PO of replacement engine routed harness incorrectly over top of engine w/o clamps, it frayed and would short enough to drop voltage, wreaking havoc. At least, this was how explained to me, and I have the frayed and burned old harness. 

[c95975]

Great, Ill swap out the Crank Position sensor.

 

Thanks guys