Grand Prix Won't Stay Running To Drive

[AKKINGS]

We Have A 2000 Grand Prix V6. It Will Start Fine, But About 5-10 Seconds Later It Dies. No Unusual Noises, Just Turns Off. If We Start It And Quickly Put In Drive, It Dies Immediately. We Can Do This Twice, But After That It Must Be Flooding Because It Will Only Turn Over Without Starting. I'm Lost. Without Spending Too Much By Buying Parts That Aren't Needed, Where Should I Start?

[BNaylor]

Originally Posted by AKKINGS

We Have A 2000 Grand Prix V6. It Will Start Fine, But About 5-10 Seconds Later It Dies. No Unusual Noises, Just Turns Off. If We Start It And Quickly Put In Drive, It Dies Immediately. We Can Do This Twice, But After That It Must Be Flooding Because It Will Only Turn Over Without Starting. I'm Lost. Without Spending Too Much By Buying Parts That Aren't Needed, Where Should I Start?

Start with the basics. Check ignition and fuel. Make sure you're getting spark first. On fuel you can test fuel pressure. How old is the fuel filter?

Which model Grand Prix do you have and how many miles?






Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

[crx1989]

My fuel pump just went out on my 2002 GT and it sounds like yours could be going on yours. If you can get it to run 5-10 seconds, it sounds like it's getting a good spark. Fuel filters take awhile to foul up unless you've been putting in bad gas consistantly for awhile. Once the car shuts off, go check to see if there is any pressure in the fuel line at the fuel rail. it looks like a tire valve. it should have a plastic cover on it.

[BNaylor]

The proper way to check fuel pressure which will test fuel pump relay, flow from the fuel pump, fuel filter, lines and fuel pressure regulator (FPR) is to connect a fuel pressure tester at the Schrader valve located on the FPR. With vacuum on it will read 45 - 55 psi. With vaccum off around 52 psi median.

Also a defective crankshaft position sensor will cause to stall out after a period of time and cause hard starting which is still in essence a possible ignition problem.

BTW - Initial fuel pressure is checked without the engine running. Here's the procedure:


Install fuel pressure gauge to Schrader valve on the FPR.

Remove vacuum hose from FPR.

Turn ignition to on (not start) and note fuel pressure reading on gauge.
Record reading.

Start engine and verify you feel vacuum at the hose end.

Reconnect vacuum hose to FPR.

Note fuel pressure reading again and record reading.

Now compare the first and second reading.

Fuel system pressure reading should be 4 -7 psi less with vaccum hose re-connected/installed. Fuel pressure should decrease as vacuum increases.







Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.