Question about 1994 Oldsmobile Bravada

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94 olds hard starts when warm, starts when cold and runs rich

I replaced throttle position sensor, MAP sensor, spider injector, distributor cap, rotor, ohmed out ignition coil, replaced engine coolant temp sensor, torque converter, catalytic converter, spark plugs and wires. Any suggestions?

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  • stewarts73 May 09, 2009

    I will see if I can get a fuel pressure gauge, and run those tests you suggest. That is one thing I haven't done. I paid an Aamco technician to replace the fuel filter along with all the other upgrades and when I received the vehicle, he said that he forgot to replace it. I let them put it in, and supposedly they did. I may have to check and see that was done. Thanks for your help. I will get back with you when I run those tests.

  • stewarts73 May 09, 2009

    gpgab97,
    I have not looked at the fuel pump, filter, or regulator. Supposedly the filter is new and I can hear the fuel pump when I turn the key to accessory. I will try those and get back to you. Thanks for your help.

  • guido brunelli
    guido brunelli May 11, 2010

    Fuel pressure regulator, fuel filter or pump? Try blowing air through the filter to eliminate the possibility of a clog or recurring debris and let about a pint of fuel drain from the tank to filter side to get anything that shouldn't be there out. Also, once reassembled, can you hear the fuel pump pressurizing the fuel lines when the key is turned to accessory? Is it taking longer than 2-3 seconds?

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Bruce Bracey
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If you can get a fuel pressure gauge, check and see if the pressure is 16 to 24 lbs after the engine has warmed up.
I would connect the pressure gauge when the engine is cold, make sure it does not leak or touch anything hot, place the gauge between the hood and the windshield and drive the vehicle until it is at the temperature you feel it "starts hard". Shut the engine off and try to repeat the no start or hard start and make sure the pressure is correct.
Also, when you shut the engine off, watch the pressure and make sure it holds and does not drop to (0 LBS) of pressure.
One last question, has the fuel filter been changed in the past 30K.
Let me know.
Regards,

Posted on May 08, 2009

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