Stalling when engine hot - no code

[veblenesque]

I don't live near a Porsche dealer and my otherwise reliable 2.7l 2001 Boxster (97k miles) has a serious problem. After driving for about 25 minutes, the engine will shut off, all the idiot lights will turn on, and I will have to find a convenient place to coast toward. If I wait about an hour, the car will restart and again run fine until it stalls again. It had an MAF code (which I ignored for a while) and I replaced the MAF, but this didn't stop the stalling issue. Now it's not kicking out any engine codes. My only option is to drive 6 hours to a dealer - is there anything inexpensive I can try to replace?

[Glyn]

Does it not restart immediately?

If not the next time it stalls undo the petrol filler cap - then refit immediately - then try to restart - I am thinking along the lines that the fuel tank breather is blocked and it vaccums until the pump cannot overcome the vaccum - then after stalling and waiting an hour the vaccum has dissipated allowing fuel to be pumped again

[ericinboca]

I don't live near a Porsche dealer and my otherwise reliable 2.7l 2001 Boxster (97k miles) has a serious problem. After driving for about 25 minutes, the engine will shut off, all the idiot lights will turn on, and I will have to find a convenient place to coast toward. If I wait about an hour, the car will restart and again run fine until it stalls again. It had an MAF code (which I ignored for a while) and I replaced the MAF, but this didn't stop the stalling issue. Now it's not kicking out any engine codes. My only option is to drive 6 hours to a dealer - is there anything inexpensive I can try to replace?

Might be a dying fuel pump. When they start to die, they fail first when they are hot; once cooled, they work again till hot, and then die again.

[veblenesque]

I don't live near a Porsche dealer and my otherwise reliable 2.7l 2001 Boxster (97k miles) has a serious problem. After driving for about 25 minutes, the engine will shut off, all the idiot lights will turn on, and I will have to find a convenient place to coast toward. If I wait about an hour, the car will restart and again run fine until it stalls again. It had an MAF code (which I ignored for a while) and I replaced the MAF, but this didn't stop the stalling issue. Now it's not kicking out any engine codes. My only option is to drive 6 hours to a dealer - is there anything inexpensive I can try to replace?

Might be a dying fuel pump. When they start to die, they fail first when they are hot; once cooled, they work again till hot, and then die again.

Thanks - I'd thought about the fuel pump. Is there any easy way for my mechanic to test it, or should I just replace it and see if it works?

[txhokie4life]

I don't live near a Porsche dealer and my otherwise reliable 2.7l 2001 Boxster (97k miles) has a serious problem. After driving for about 25 minutes, the engine will shut off, all the idiot lights will turn on, and I will have to find a convenient place to coast toward. If I wait about an hour, the car will restart and again run fine until it stalls again. It had an MAF code (which I ignored for a while) and I replaced the MAF, but this didn't stop the stalling issue. Now it's not kicking out any engine codes. My only option is to drive 6 hours to a dealer - is there anything inexpensive I can try to replace?

Might be a dying fuel pump. When they start to die, they fail first when they are hot; once cooled, they work again till hot, and then die again.

Well if the removing the gas cap doesn't work, then the next time it dies, you could check the fuel pump is working

properly. You're mechanic can do a fuel pressure check. You can also check to see

if the fuel relay switch is engaged (one of the relays in the cabin drivers side).

If it won't start, and the relay is not firing, than you can jumper the relay and get the pump

to run (if it will).

a good mechanic should be able to determine the state of the fuel pump assuming that he can

capture the failure mode.

mike

Thanks - I'd thought about the fuel pump. Is there any easy way for my mechanic to test it, or should I just replace it and see if it works?

[tomas986]

Was there a resolution for this issue? Any update? I am curious because I think my car has the exact same issue.

[RKPorsche]

same here

[JFP in PA]

Check your crank position sensor.  They are well known for acting up when warm and not letting the car start, but not throwing any codes.

[RKPorsche]

Replaced Water Pump and  Thermos stat. Found one of the Radiator Fan fuse was blown !!!. So replaced it. So far the vehicle did not stall in the traffic. But noticed the temperature is reaching ~200 in traffic.  

[JFP in PA]

Are you sure the cooling system does not have any air pockets in it?  Check your radiators for debris that collects and blocks the airflow: