Question about 2000 Pontiac Montana
Did you check the vacuum that goes to the fuel pressure regulator. are the injectors working. sound like a vucuum problem or injector issue
Posted on Nov 08, 2012
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Posted on Jan 02, 2017
SOURCE: car wont start
check your fuel pressure it should be 35 psi .fuel pump relays dont go out but check all fuses with test light there is a fuel injector fuse but most likely problem is your fuel pump!
Posted on Mar 11, 2009
SOURCE: Son's 99 Grand Am Gt
HEY!! I had same problem and i didnt know i solved it til i put in a brand new battery! I think the battery was getting old, and the extra amps told the 'computer' that the car wasnt running and it just died at start up sometimes. the new battery must have kept the computer from 'glitching off' when we started it. and all is great now!
Posted on Mar 17, 2009
SOURCE: low gas pressure in 96 sunfire.
You have mentioned that you replaced the O2 sensor. The oxygen sensor is completely ignored by the engine computer while the car is starting, and doesn't come into play at all until the engine warms up completely. Are you sure you have a fuel pressure problem? If so, replacing the O2 sensor would not have any affect.
To be sure you have a fuel pressure problem, you need to measure it. This car does not have a fuel pressure test port, so you need an inline fuel pressure test gauge. To test the pressure, connect an in-line gauge and switch your ignition switch to the "run" position. (Do not start the engine.) The fuel pump should run for two seconds. During this time when the engine is not running, you should have between 41 and 47 PSI of fuel pressure. If you start the engine, the fuel pressure should drop somewhat at idle (maybe somewhere closer to 28-35 PSI). Fuel pressure is regulated according to intake manifold vacuum, so at idle, it should be fairly low, while at higher throttle settings, it should be higher.
From what I gather, your car cranks for a long time before starting. If you suspect low fuel pressure, a defective fuel pump relay could cause that condition. The relay is located in a relay/fuse box under the hood on the driver's side of the car. If the relay fails, the fuel pump can still be energized by the engine oil pressure switch. This switch closes when engine oil pressure reaches ~4PSI. If your engine is not producing 4PSI of oil pressure while cranking, or if it takes a while to reach 4PSI, that would explain your problem.
Posted on Jul 28, 2009
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