97 Olds Dies after running for a while

[BlueCaprice]

Hello. I have a 97 Olds giving me some trouble. When I first start the car it runs very good but after it's been running awhile, usually anywhere from 20 minutes to an hour, it will just stall. If I try to start it right back up it will usually just crank and not start, but if I wait like 20 or 30 seconds it will start back up and go for little while, then stall and do the same thing. Once it starts acting up, sometimes the car will kind of sputter and not want to accelerate if I hit the gas hard while driving. I tried swapping out the ICM but it's still stalling. Sputtering seemed better though but that could be coincidence. The only computer code I'm getting is for the EGR. Can a faulty EGR cause that to happen? I didn't think it would. I just drove this thing over 200 miles with no problem. Then I got home, and it stalled in traffic and I had to wait a minute before it would start. Any ideas would be really appreciated and thanks for reading.

[thisnametooktolong]

No Codes?
how about pending codes right after it stalls?
is the ICM new?

[BlueCaprice]

Just the code for the EGR but I didn't think that would be causing it not to start like that. The ICM isn't new. It's from a local junkyard, but the car seems to be doing the exact same thing with it.

[thisnametooktolong]

without a good scanner, a new ICM, or my hands on the car when it gets silly



I will not touch it with a my ten mm Pole

[BlueCaprice]

I had the car scanned at autozone. They have a scanner I can rent but I didn't see the reason to since I knew the code. I had it scanned three times and all three times I got a code for the egr valve, but nothing else.

[thisnametooktolong]

the P400s is the EGR codes 0400 0401 0402 R all flow, to much, and to little. 0403 is the genaric CKT problem 0404 through 408 is ckt a and b High and or low. the 410 up is air injector problems

so what code you have? it should be fixed, but when the car dies that is the time to start toruble shooting things like fuel pressure, scanning the MAF, crank and cam sensors. Generaly after a GM is running and a cam or crank sensor dies it will keep running and geberate a Mil so I dont think that is the deal you have problems with.

[moscow913]

Unplug the EGR. If it still happens, it's not the EGR. If it doesn't put a new EGR on it.

[BlueCaprice]

Originally Posted by moscow913

Unplug the EGR. If it still happens, it's not the EGR. If it doesn't put a new EGR on it.

I tried unplugging it. It makes no difference. It still does the exact same thing.

[thisnametooktolong]

when that puppy dies hav you quick like a bunny checked to see if you have spark?

have you quick like a bunny tried hitting the fuel valve?

[BlueCaprice]

Originally Posted by thisnametooktolong

when that puppy dies hav you quick like a bunny checked to see if you have spark?

have you quick like a bunny tried hitting the fuel valve?

Well, it doesn't ever stay dead long enough for me to do that. I'm not sure, but I think I may have gotten to the bottom of it. I've been thinking since there's still no codes that maybe it was a bad fuel pump, so I borrowed a fuel pressure gauge from a buddy and connected it. At idle I have about 37-38 PSI. When I hold the gas lightly in park it jumps up to about 45 PSI for a second and then drops down to about 30, but if I drive it, the harder I press the gas the lower the pressure goes. If I floor the pedal it drops down as low as 5 psi and the car hesitates and takes forever to accelerate. The pressure stays steady and it responds well if I drive easy though. Shouldn't my pressure remain between 45 and 55 regardless of how fast I'm going or is it normal to be dropping like that?

[BlueCaprice]

I changed the fuel pump and all is fixed. Thanks for all your help.