Question about 1996 Pontiac Grand Prix

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96 grand prix 3.1 got fuel to rail brand new pump wont start, starts for 3 3 to 4 seconds then quites, and then back fires

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Replace your fuel filter and buy Z MAX (only thing i trust) fuel and engine system restore ( about 35 bucks at any auto store but so worth it). what has happend is the fuel in the tank is dirty or carmalized, basically the car had been sitting for a while and the fuel seperated in your tank. normal conventional gas is not strong enough to break down deposits. and when you replace your fuel pump, make sure the whole wiring harness or the actuall fuel pump harness is replace. other wise you keep blowing your fuel pump and/ or keep backfiring

Posted on Oct 04, 2010

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My 98 grand prix gtp (3800) (L67) wont start...wines then BACKFIRES. everything from the heads up are brand new except the coil pack housing which ironically enough was submerged in antifreeze. however i...


If your firing order is correct(165432), then I would suspect the drenched coil pack. That oily antifreeze will penetrate every nook and cranny of the coil. It's probably shorting out and cross-firing. I would go ahead and replace it. Double check your firing order again. The back cylinders are 2-4-6, counting from to back, but that is not the firing order. The plug wires would attach to the coils in the following order, counting from the front of the coils(nearest to the front of the car)to the rear:1-4-5-2-3-6.Let me know if any of this helps you. Good Luck.

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1 Answer

My 2004 pontiac grand prix will not start on the first or second try.


Would you describe it as it cranks over normally but takes longer to start than normal especially if the engine is hot and sits for about 15 to 20 minutes before trying to start?

The first thing I would check is the fuel pressure regulator. It will be located on the fuel rail on the drivers front of the engine. It will be a round looking part held into the rail with a snap ring. It will have a small vacuum hose attached to it. Remove the vacuum hose and see if gas comes out of the nipple. If it does than the regulator is bad and will need to be replaced.

Two things happen when the regulators leak like this. the first is that fuel pressure drops. Low fuel pressure makes the fuel easier to boil in a hot engine. Fuel injector need liquid fuel to work properly. the other is that unmetered fuel ends up in the intake essentially flooding the engine. In both cases the engine eill need to be cranked over long enough to clear the flooded condition and for the fuel pump to run long enough to push liquid fuel back into the fuuel rail and restore fuel pressure.

Here's a trick to try next time. Turn the key to the run position (do not turn it all the way to the crank position). Wait 5 seconds and turn the key off then imediately turn the key back to the run position and wait another 5 seconds. Repeat this 3 or 4 times then crank the engine over. If it starts right up every time than you definitely have an issue with fuel pressure bleeding off.

The most common cause is a leaking pressure regulator but it can also be the fuel pump.

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1997 Grand Prix GT.new3800 and fuel pump, spark and gas, nofire!


Hello! When you swapped the engine, did you have the PCM (Powertrain Control Module) from the new motor as well? If not - you will need to have a "CASE" learn run on the PCM that you're currently using (the one from your previous engine). Important note: the 1997 Grand Prix GT's and GTP's have quite a few differences from the 98-03's. The CASE procedure is run using the Tech II tool and can be done at any dealership in about 10 minutes. If they aren't sure what that is, suggest to them that they follow the procedure for DTC 1336 - Crankshaft Position (CKP) System Variation Not Learned. :)


Hope this helps and good luck!

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is this a supper cahrged grand prix if so check fuel pump resistor located behind right front head light or on fire wall its made of white ceramic has to wires going to it jump the two wire on the connection going to it if it runs longer then 15 min then replace resiustor.

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more than likely ur injectors are malfauctioning run some chevron techron injector hope theyre not completely bad

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