Question about 2004 Pontiac Grand Prix
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.
Posted on Oct 12, 2010
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Posted on Jan 02, 2017
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