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1998 Pontiac trans am

This is a discussion on 1998 Pontiac trans am within the General Help forums, part of the LSx Technical Help Section category; 7 to 8 codes poped up po131, po300, and quite a few more ..its also cumin up low voltage to ...

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    Junior Member smcdowell722's Avatar
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    1998 Pontiac trans am

    7 to 8 codes poped up po131, po300, and quite a few more ..its also cumin up low voltage to bank 1 and 2 o2 sensors I did a fuel pressure test and it running at 30 psi I know its one thing that's,wrong and its causzzing all the other isssues ..help needed thanks

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    Junior Member jaydean21849's Avatar
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    Senior Member Too Fast's Avatar
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    ^^^what? Converters won't cause low fuel pressure.

    OP, get the fuel pressure problem fixed first, clear codes, and see if any come back. Low O2 voltages = lean, caused by low fuel pressure. 98% chance low pressure caused by bad fuel pump. Multiple misfire caused by low fuel pressure also.

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    Smiles for 9.5 Years cammed goat's Avatar
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    I agree on the getting the fuel pressure issue resolved first. How many miles?

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    Junior Member smcdowell722's Avatar
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    thanks for the help !!!

    The car has 170000 miles borla exhaust and high flow cats what should the fuel pressure be and should I change the fuel filter to see if it'll make the diffrence ...the owner before me did say he replaced the fuel pump already if I do get a fuel pump what should I go with slp intake kn n airfilter headmen long tube headers and higjflow cats h pipe borla exhaust system is all the mods I have done to the car at the moment

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    Spaz is My Mentor SMWS6TA's Avatar
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    98 T/A w/a little mods...

    Scott how many miles on the car?


    Any recent mods?


    Never mind we post at same time

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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by smcdowell722 View Post
    The car has 170000 miles borla exhaust and high flow cats what should the fuel pressure be and should I change the fuel filter to see if it'll make the diffrence ...the owner before me did say he replaced the fuel pump already if I do get a fuel pump what should I go with slp intake kn n airfilter headmen long tube headers and higjflow cats h pipe borla exhaust system is all the mods I have done to the car at the moment
    Fix problem first worry about mods later....

    Go ahead and get a new fuel filter, they are cheap and you will eliminate one of the possible causes to your problem. I change mine every yr. Overkill yes, but better then worrying about it.

    Do you know what the previous owner replace the fuel pump with? Stock vs after market? Did he have a shop do it or himself?

    Did he change the regulator too?

    You can change one or the other separately. Smart guys will do both at same time but if $$ is in a pinch just doing the one that is bad can be done.


    The fuel pressure at idle should read about 45-55 psi. After you do the fuel filter and have no change or problem isn't solved get a fuel pressure gauge and check at the fuel rail on the drivers side. If the pressure reads steady but low it is either the pump or the regulator.

    Now if the pressure drops it most likely is the pick up tube for the pump may have a crack in it. A quick trouble shoot would be if the the tank is full you have no pressure issues however as the fuel level decreases it starts having pressure issues.

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    Junior Member smcdowell722's Avatar
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    Sry I ment to say those are all the mods the car has right know

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    Junior Member smcdowell722's Avatar
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    aright

    I do have a fuel pressure gauge its readin 30 psi slowly trims 2 20 psi wen I hit the gas he did it him self once I hanhr the fuel filter this after noon ill check the pump and the pick up he cut a flap uptop to access fuel pump more effectively

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    Your friendly policeman FinZ28's Avatar
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    Quote Originally Posted by smcdowell722 View Post
    I do have a fuel pressure gauge its readin 30 psi slowly trims 2 20 psi wen I hit the gas he did it him self once I hanhr the fuel filter this after noon ill check the pump and the pick up he cut a flap uptop to access fuel pump more effectively
    The famous trapdoor. That'll make dealing with the fuel pump easier.
    2001 Chevy Camaro Z28 A4
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    Senior Member JayTA98's Avatar
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    is the pressure holding when you prime the pump without starting it? or is it dropping? this what you will see if there is a crack in the fuel hose in the pump.
    Leak in fuel pump tube - YouTube
    Last edited by JayTA98; 07-11-2012 at 08:33 PM.

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    Senior Member Too Fast's Avatar
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    Also be sure the K&N isn't over oiled. That would contaminate the MAF, causing lean problems, but not a low fuel pressure problem. Key On Engine Off fuel pressure should be 58 psi at the fuel rail test port.

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