WHAT IS CAUSING ENGINE STALL? WHILE DRIVING ...

1995 Porsche 911

Tiny

len richan

April, 4, 2013 AT 2:00 AM

What is causing engine stall? While driving along, car stalls w/o warning then starts after a few minutes and runs great again, until the next time, Mechanics are baffled !

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Tiny

rivermikerat

April, 4, 2013 AT 2:43 AM

Check fuel pump pressure. This sounds like vapor lock.

Tiny

cadieman

April, 5, 2013 AT 4:56 AM

Remove the fuel And try driving the car does he do the same thing?

Tiny

cadieman

April, 5, 2013 AT 4:58 AM

Remove the fuel cap, does it do the same thing?

Tiny

len richan

April, 5, 2013 AT 6:35 PM

SO FAR YOU'VE PROVIDED ME WITH ABSOLUTELY USELESS INFO UN RELATED TO THE DESCRIBED PROBEM BECAUSE THE CAR RUNS GREAT UNTIL AND AFTER THE STALL OCCURS !

Tiny

len richan

April, 5, 2013 AT 6:38 PM

CAN'T BE VAPOR WITH AN ELECT, FUEL PUMP AND FUEL INJECTION

Tiny

rivermikerat

April, 6, 2013 AT 1:46 PM

Actually, yes, it can be vapor lock. Check the fuel pressure. Vapor lock doesn't occur until heat builds up enough to boil the fuel in the fuel lines.

Tiny

len richan

April, 6, 2013 AT 5:19 PM

OK I'll try it But wouldn't I have the same problem after it restarts. The problem doesn't recur sometimes for 100 miles or so !

Tiny

rivermikerat

April, 6, 2013 AT 5:40 PM

Not necessarily. The pump could have cooled down enough to provide adequate pressure and the engine compartment could have cooled down enough to keep the lines from boiling. Be sure the check the pressure once the vehicle reaches operating temp and right when the problem surfaces.

Tiny

len richan

April, 8, 2013 AT 5:22 AM

It's fairly impossible to check pressure when I'm stuck on a mountain road or a freeway; plus it starts again and runs normal, some times within a minute or two ! Any suggestions on how to catch the problem as it happens in a mechanic's shop?

Tiny

rivermikerat

April, 8, 2013 AT 3:58 PM

Aside from letting them have it for a few days and filling the tank for them, asking them to idle it and drive it while carrying a fuel pressure gauge? Not really.

What I would recommend is carrying both a fuel pressure gauge and a multimeter or test light with you for awhile. When the problem occurs, check the pressure and check for voltage at the pump.

Is this something that happens on cold and hot days, or just hot days, or just cold days?

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