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  1. #1
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    5mpg and no codes!!!!(2000 zr2)

    HEY all.......im looking for help to aid in fixing my truck and thought ls1 guys would be smarter than the idiots on s10forum

    my truck tore apart waiting for parts stores to open

    but my 2000 zr2 is getting close to 5mpg and im fed up
    so far ive done;
    --cap/rotor
    --ac-delco platunum plugs
    --ac-delco wires
    --new TB
    --IAC replaced
    --IAT replaced
    --fuel pump
    --fuel filter
    --ign coil
    --ign module

    So i started tearing the top end of the intake apart to see MOST of my o-rings had been leaking and i found dirt on my fuel pressure regulator!!!! The spider assembly had RTV around it so it would seal to intake

    The MAP sensor was really loose but other than these issues i dont see puddling of fuel or even pressurized nothing drips.

    I ran my diagnostics tool on it and all sensors are reading correctly and within specs.......The oxygen sensors are working correctly also.


    PLEASE help me!!!!!!!!!!!!!!! i cannot afford to drive my truck now and its my only ride to work right now


    so far all have been replaced:

    --MAF
    --MAP sensor
    --fuel pump(gauge still shows 41-51psi......)
    --fuel filter
    --air filter
    --MPFI KIT(replaces JUNK spider setup)
    --spark plugs
    --wires
    --cap/rotor

  2. #2
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    any codes being thrown???

  3. #3
    Senior Member FasstChevys's Avatar
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    '10 ZR1

    This might be a stretch..........but, do you have a fuel leak somewhere that you can't see?

  4. #4
    Senior Member FasstChevys's Avatar
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    '10 ZR1

    Quote Originally Posted by Spaz View Post
    any codes being thrown???
    Thread title reading fail




































  5. #5
    Veteran pajeff02's Avatar
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    Black & Blue
    '02 WS.6 / '07 Suburban

    Get a scanner on that thing and let's check out your short (STFT) and long (LTFT) term fuel trims.

  6. #6
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    no codes and only thing really obvious is the fuel trims being 8-10% plus

    and there are no lines wet from tank to motor

  7. #7
    Senior Member FasstChevys's Avatar
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    '10 ZR1

    Quote Originally Posted by pajeff02 View Post
    Get a scanner on that thing and let's check out your short (STFT) and long (LTFT) term fuel trims.
    The thing about that is...........let's say that's the problem......how did they get changed?? What are they supposed to be? etc, etc?

  8. #8
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    Quote Originally Posted by FasstChevys View Post
    Thread title reading fail





    sarcasm fail...

  9. #9
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    Quote Originally Posted by Toyota h8r View Post
    no codes and only thing really obvious is the fuel trims being 8-10% plus

    and there are no lines wet from tank to motor
    have you checked while it was running... fuel evaporates fast...

  10. #10
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    idle




    EWAY:



  11. #11
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    sounds like it might be stuck in closed loop???

  12. #12
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    Quote Originally Posted by Spaz View Post
    sounds like it might be stuck in closed loop???
    got any friends that can swap a PCM with???

  13. #13
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    Quote Originally Posted by Spaz View Post
    sounds like it might be stuck in closed loop???
    when its cold it fires up in OPEN and around 150(ish) it goes into closed loop

  14. #14
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    How does it rev? My truck is getting shitty mileage and wont rev past 3500 with a load on it.

    Figured out that the cats are clogged up, so off they come in a day or two.

    I've got a 1996 Chebby 1/2 ton with the tree fiddy.

  15. #15
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    Quote Originally Posted by Spaz View Post
    got any friends that can swap a PCM with???
    nope......not until i can get to junkyard this weekend

  16. #16
    Lt1/m6 driver :P Toyota h8r's Avatar
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    327-TPI/A4
    1992 Trans am

    Quote Originally Posted by Grimpala View Post
    How does it rev? My truck is getting shitty mileage and wont rev past 3500 with a load on it.

    Figured out that the cats are clogged up, so off they come in a day or two.

    I've got a 1996 Chebby 1/2 ton with the tree fiddy.
    mine has a gutted cat and non foulers.......i actually was getting 2mpg better after for few months

    The truck runs fine and like a champ.......seems to have better power at 60% petal than WOT though.....never understood that one.

  17. #17
    O U 8 1 2 Spaz's Avatar
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    1999 trans am

    Quote Originally Posted by Toyota h8r View Post
    when its cold it fires up in OPEN and around 150(ish) it goes into closed loop

    sorry... had that backwards...

  18. #18
    Veteran pajeff02's Avatar
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    '02 WS.6 / '07 Suburban

    Looks like the trims are running in the negative, so the PCM is pulling fuel, not adding it. I agree, you have to find the root cause of the fueling issue, the trims are simply a quick way of seeing what the PCM is thinking.


    Next step -- pull some plugs and see if they are black. That would indicate a rich combustion mixture. Tan or brown is on the money, totally clean, white or speckled means lean.

  19. #19
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    Quote Originally Posted by Toyota h8r View Post
    mine has a gutted cat and non foulers.......i actually was getting 2mpg better after for few months

    The truck runs fine and like a champ.......seems to have better power at 60% petal than WOT though.....never understood that one.
    A little side note...on the full size trucks up to 97 or 98 the rear O2 sensors do nothing. I've had mine unplugged for about 50 miles so far and no CEL. My 96 Impala, pulled the rear O2's and it lit up like Christmas.

  20. #20
    I like turtles GTP231's Avatar
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    09Ram 1500 83 Thunderturd

    How long had it been running in those scanner shots? Is it getting fully warned up? The GTP would guzzle gas in the winter the colder stats. Just a thought

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