Question about Pontiac Firebird

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My car is a 91 pontiac firebird 3.1 liter v6 and will start right up but once started will not react when pushing down the gas pedal it idles fine but when I put in drive or just sit pressing the gas it sounds like the car is choking firing oorder is correct tune up has been done been told that it is possibly a tps sensor or maf sensor. I have not checked or changed the fuel filter. please help this car is a gem and just not running right \.. Thanking you in advance

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  • Jason r. Hicks May 04, 2010

    thanks emmissionwiz I am going to check the diag codes for sure I appreciate your quick response and will keep you updated!!

    Thanks again

    Jason

  • Jason r. Hicks May 04, 2010

    ok i checked the codes the first was 12 and the second was 15 thats the coolant low sensor? how do I reset the codes after checking them to make the check engine light reset to maybe pick up a different code maybe?\

  • Jason r. Hicks May 04, 2010

    thank you again for this great info. I have written aq reply to your advice this is my first time using this tyoe of method with info like this so it is greatly appreciated and mindblowing!!Thank you

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OK the TPS would cause a stumble but not a condition like u have, a MAF however would cause this and leave no fault codes, also a faulty fuel pump will cause this, the pump delivers enough pressure to keep the car running at idle/low RPM, but if u ask for more power it will fall flat on its face, so idle only is the symptom, u need to do the following, get the fuel pressure checked under a load, the pressure should be at least 50 pounds and increase when u goose the throttle, if the fuel pressure is ok then it is possible the MAF is the problem, but without the proper system scanner to watch the electronic signal from the MAF that is a guess, I do know that the MAF is a common problem on this year and very likely the problem, Also you have not done a fault code test, that needs to be done before you replace any parts, below is how u do a fault code test without a scanner.

http://check-engine-light-codes.blogspot.com/2006/03/gm-1983-95-vehicles-obd1-codes-self.html

Posted on May 04, 2010

  • yadayada
    yadayada May 04, 2010

    12 is not a code, it means ready to test, to clear codes disconnect the battery NEGATIVE cable for 5 minutes.

  • yadayada
    yadayada May 04, 2010

    the coolant temperature sensor is near the thermostat housing, make sure the connector is connected and in good shape, if not replace the sensor and the connector with the new design sensor and connector from any G

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