GP just shuts off

[inafogg]

I still think 2nd post is correct fuel issue

[3echo9]

Originally Posted by tblake

it will, good point, but doesnt a bad cam position sensor cause extended crank times as the PCM defaults to just the crank sensor signal? Also when it starts I think it will trip an ses light.

You would hope.

Here's my theory. Bare in mind that I am by know means a technician.

The cam sensor may be sending signals to the PCM. The PCM does not have the ability to decide whether they are accurate or not. Only that input is present. The PCM assumes no fault since it is getting signals from the cam sensor, result....no SES since the PCM assumes the cam sensor knows what it's doing.

I know...sounds a bit far fetched but that's how I see it.

Besides...it saves you the time and money to change them both since they are in the same space.

[BNaylor]

I have no opinions as to the crank or cam positions sensors being the cause since I've already stated my opinion of the OP's issue. However:

To clear the air the PCM module does monitor the camshaft position signal (CMP). It is more complex and mathematical than described. It constantly monitors the number of pulses on the CMP signal circuit and compares the number of CMP pulses to the number of 24X/18X pulses and 3X pulses being received from the crank position sensor. So technically if the PCM receives an incorrect number of pulses on the CMP signal circuit then it should trigger a P0340 or P0341 DTC. That way the following can or should occur. If the camshaft position signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injection mode based on the last fuel injection pulse, and the engine will continue to run. The engine can be restarted and will run in the calculated mode as long as the fault is present.


opcorn:

[regal GS]

been reading your issue, i have a 2000 bucik regal GS supercharged. last sunday, when on the freeway the car died. symptoms are the same, engine starts but dies within two seconds. the car is at the shop they get no codes and the fuel pump was replaced. have mentioned all the posted items which they have already checked (okay). the MAF sensor requires them to special order the part, so at this time they are sourcing a loner.
if there are any other options or if you found a fix, let me know - i will inform the group of the GS outcome -regards

[BNaylor]

Originally Posted by regal GS

been reading your issue, i have a 2000 bucik regal GS supercharged. last sunday, when on the freeway the car died. symptoms are the same, engine starts but dies within two seconds. the car is at the shop they get no codes and the fuel pump was replaced. have mentioned all the posted items which they have already checked (okay). the MAF sensor requires them to special order the part, so at this time they are sourcing a loner.
if there are any other options or if you found a fix, let me know - i will inform the group of the GS outcome -regards

Welcome to AF.

What happens when the electrical connector to the MAF sensor is disconnected?

Unlike the normally aspirated SII 3800 you may still have a fuel related problem. Did you try bypassing the fuel pump resistor for the fuel pump speed control relay located in the engine compartment fuse box? The OP has a normally aspirated SII 3800 engine and the fuel pump circuits for '97-'00 GTP and Regal GS is different so the problem you are having may not really be the same, maybe at least the fix.

The fuel pump speed control relay for the '00 Regal GS is relay #18. See link below located at our Grand Prix Tips & Maintenance forum.

Click here

[AdamIPFW85]

Its getting worse. It just did it 3 times in a row.

[tblake]

Does it restart immediatly? If not, find out why. We could speculate all day long

Have you checked fuel pressure at idle like Bob said yet? Might even try taping the fuel pressure guage and drive around untill it dies while you keep your eye on it.

Still sort of sounds like an ignition issue to me. Either CPS or Ignition Module. Could remove the ignition module and have a place like autozone test it for you. Once they have, and if they say it good, have them check it over and over again just to get it good and hot.

[AdamIPFW85]

Hopefully, sometime this weekend I can get the ignition module checked to rule it out. I don't know if I should go ahead and spend the $50 on the fuel pressure reg. or not. I don't have a fuel pressure gauge to check it. So thats out unless I find someone that has one. Still does the same thing. Dies a second after ignition. Seems to start easier than it did. But if I listen to make sure the fuel line primes all the way it increases my chances of it staying running by around 50%. I also need to replace the trasmission line that goes to the top of the radiator changed. Some dumba** cut it to change the tranny fluid, some while back. The shop I go to said that was goin to be like 200 because they have to drop the fans to route it the way it needs to go. SO if anyone has some cheaper ideas on that I would appreciate it.

[tblake]

You can rent fuel pressure guages from places like autozone or advance for free. Just have to pay the full amount up front, then they refund completly if its returned in a timly manner.

Sorry cant help you with the tranny cooler line issue. The doofus that cut it and rerouted it must be a mojor DINK. if its worth doing, its worth doing right! Especially on a GP.

[richmn605]

had the same problem it took my mechanic 4 months to figure out that it was a crank sensor. No codes showed for this. I also recently had it die out and misfire bad. that problem was a maf air flow sensor. you could try both of these buy is sounds like a crank sensor. I have a 99 grand prix gt. Good luck!!

[BNaylor]

One thing I'd like to point out on a typical suspected bad crank position sensor is although no codes may be set or SES/CEL light another good indication is the tach acting up (dipping) or the TRAC OFF light comes on since the PCM module has gone into a failsafe mode.

Also, one member that posted did get resolution of his issue. He informed me the fuel pump resistor was bad but he has a L67 Supercharged SII 3800 engine so that is not applicable to the SE/GT GP models.

Originally Posted by regal GS

been reading your issue, i have a 2000 bucik regal GS supercharged. last sunday, when on the freeway the car died. symptoms are the same, engine starts but dies within two seconds. the car is at the shop they get no codes and the fuel pump was replaced. have mentioned all the posted items which they have already checked (okay). the MAF sensor requires them to special order the part, so at this time they are sourcing a loner.
if there are any other options or if you found a fix, let me know - i will inform the group of the GS outcome -regards

Originally Posted by BNaylor

Unlike the normally aspirated SII 3800 you may still have a fuel related problem. Did you try bypassing the fuel pump resistor for the fuel pump speed control relay located in the engine compartment fuse box? The OP has a normally aspirated SII 3800 engine and the fuel pump circuits for '97-'00 GTP and Regal GS is different so the problem you are having may not really be the same, maybe at least the fix.

The fuel pump speed control relay for the '00 Regal GS is relay #18. See link below located at our Grand Prix Tips & Maintenance forum.

Click here