Question about 2001 Pontiac Firebird

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No start on 3.4 engine

1994 pontiac firebird has 41 pounds fuel pressure, has spark, will run with starting fluid, trying to find cam sensor location, can you help

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  • mauicountych Dec 18, 2008

    mike humble, the fuel pressure is 40 p.s.i. with return line pinched and cam sensor unplugged, still no start, ken

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If your car has spark and runs on starting fluid you have a fuel problem not a cam sensor. 41 lbs of fuel pressure is not enough. Try pinching off the return fuel line and check the pressure. Let me know what you find.

Posted on Dec 18, 2008

  • 3 more comments 
  • mikehumble Dec 18, 2008

    If the fuel pressure is still 40 pounds than you fuel pump is junk. When pinching the line the pressure should jump

  • mikehumble Dec 18, 2008

    I will lok up the fuel pressure specs tonight and post them tomorrow

  • mikehumble Dec 18, 2008

    And why are you unplugging the cam sensor?

  • mikehumble Dec 19, 2008

    One other problem these cars had is a bad fuel pressure regulator. Pull the vaccuum hose off it and see if there is gas inside the hose. I am still trying to find the fuel pressure specs. I usually get them out of my scan tool but it does not have them for this car.

  • mikehumble Dec 27, 2008

    Have you fixed it yet and if so what did you find?

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I have a 1986 Pontiac Firebird was running fine then just stopped running. Fuel pump or what?


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Probably lost either spark or fuel. First try some starting fluid into the throttle body (take off the big air boot) and see if the engine tries to run on it. If it does, you need to see if the fuel pump quit working. Best is to check fuel pressure-autozone and others rent or loan fuel pressure gauges. If pressure is not there with key on, likely a bad fuel pump. (you should hear the pump turn on for 2 seconds when turning the key to on, not start-this will pressurize the lines up to the fuel rail and to the injectors. Listen for the pump to turn on.)

If you have gas up to the engine, and the starting fluid caused nothing, check for spark. Buy a spark tester from a parts store and check for spark on 2 or 3 spark plug wires. If no spark, the ignition system went out. This is often due to the Crank Position Sensor or the Ignition Control Module.

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1996 pontiac firebird will start up and then it will die . The fuel pump is working.


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Nov 23, 2012 | 1995 Pontiac Firebird

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The car will not start. the engine turns over but will not start i have spark and gas... 3.4L 1994 firebird


1.= HOW MUCH FUEL PRESSURE DO YOU HAVE?
YOU NEED AROUND 30 TO 45 LBS.
2.= MAKE SURE YOUR FUEL PRESSURE DOES NOT DROP RAPIDLY AFTER YOU SHUT YOUR KEY OFF.
IF IT DROPS REPLACE YOUR PRESSURE REGULATOR.
3.= YUOR PLUGS COULD BE FOULED TOO, IT HAPPENS.
IF YOU DO NOT HAVE ENOUGH FUEL PRESSUR THIS WILL CAUSE YOUR INJECTORS TO RUN RICH.

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1 Answer

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I assume that you do not have a "check engine" light?

The next thing I would do is check the pressure from the fuel pump. You can have this done at your preferred garage, or by purchasing a fuel pressure gauge from any parts store.

Vent the fuel tank vapors by loosening the fuel cap. Remove the electric fuel pump fuse and start the engine. Allow the engine to run until it runs out of fuel and stalls. After spinning the engine over for a period of 3 to 5 seconds, turn off the ignition switch and install the electric fuel pump fuse. Next, install a fuel pressure gauge in the fuel rail supply line, and secure the fuel tank cap. With the ignition key in the on position, verify that no leaks are present and start the engine. Visually verify the PSI reading on the gauge. The pressure for your vehicle should be 41-47 PSI (Pounds per Square Inch). Hope this helps and good luck!

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