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Thread: Error in my tune-$100 to find it for someone

  1. #11
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    I would still change it out so that it's correct!

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  2. #12
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    Get it on a dyno and hook up a timing light and see what happens... It has to be a spark issue, it just looks like a rev limiter. If it was fuel the wideband would reflect it.

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  3. #13
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    Not necessarily... it can be fuel and the wideband read incorrectly...

    Still.. i feel its a coil issue as when it "heats" up it starts to act weird. The tune has nothing "wrong" that would make this happen... If it misses it will read lean.
    "All that is needed for the triumph of evil is that good men do nothing..."

  4. #14
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    Quote Originally Posted by 67SS509 View Post
    Thanks for the help here guys!
    Attached is a log from today. Injectors are logged on this one.

    To answer some of the questions............

    -It is mafless
    -B4004 table is stock from factory as trucks and f-bodies, Corvettes have this table filled all the way down. Filled my table and is included in the today's log. Didn't help.
    -O's in airflow table...glitches from so many flashes I guess..corrected
    -I have swapped out everypart on the car but the paint
    -The only table with ECT involvement is B3702....Injection Timing...don't know what to try with this one
    -Fuel is MS109 lead free VP Racing...ran 2 years on this with no problems
    -If it was a real misfire from a bad coil or injector it would throw a code
    Not necessarily. It can miss and not throw a code.

    One more thing to try: Change the PCM.
    "All that is needed for the triumph of evil is that good men do nothing..."

  5. #15
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    Wouldnt all the coils have to be bad in order to not let it rev? If one was bad it would just run bad but would still rev.

    It does seem that the only thing left is to replace the computer.

    Lee

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  6. #16
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    Too big of a miss on a few cylinders and you will have a problem.. I had a similar problem, changed ECUs and was done with it.
    "All that is needed for the triumph of evil is that good men do nothing..."

  7. #17
    Lifetime Member 67SS509's Avatar
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    This is the 3rd PCM I have tried. Thought the original 98 was bad and swapped it out. Then I converted to the 99-04 PCM with the new stand alone harness. Have changed the coil packs and then tried them on my truck and they ran fine. The injectors were new but I bought another new set and tried that. Second new set of MSD wires. Second set of new plugs. Second new fuel pump. Second new fuel regulator. 4 new crank sensors. 2 new cam sensors. 3 new TPS switches. Burned a 50 gallon drum of VP. Burned up a set of drag radials. I have spent thousands chasing this problem.

    The reason I'm still using an auto trans base tune is because I'm still using the stock shifter and park/neutral switch.

    I agree it only takes fuel and ignition, the right amount at the right time. I feel the amount is right but is occuring at the wrong time.

    In the log today starting at frame 1237 I did a 5 sec blast. AFR looks normal and followed commanded along with everything else, but it was breaking up so bad it would not accellerate. It should have hit 7200 rpm. It just doesn't make any sense to me.
    2002 Chevy truck, SCSB 2WD, Stroked LS3 w/Big Mutha Thumper cam
    2002SS Camaro LS7/427 with stock suspension setup
    2012 Chevy truck, SCSB 2WD, Magnaflow exhaust + K&N

  8. #18
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    So, your telling me that cold you can go out there and do a 5000 to 7000 RPM blast and log it?

    Is it possible that you have the injector wiring wrong and it's firing the injectors in the wrong sequence?

    Maybe this could be resoned because the injector timing cold is fired at a different time.

    Change B3702 and B3703 all to 2.55 and see if it will rev....

    230" Dragster - 2000 LS1, 02020003 Speed Density, PRC 2.5 Heads,
    MS3 Cam 237/242 .603/.609, Vic Jr. intake, Holley 1000CFM TB,
    PowerGlide, 5000 stall converter. 8.70@154 MPH

    My Projects Homepage: http://www.horsepowerracing.com

  9. #19
    Lifetime Member 67SS509's Avatar
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    Quote Originally Posted by LS1_Dragster View Post
    So, your telling me that cold you can go out there and do a 5000 to 7000 RPM blast and log it?

    Is it possible that you have the injector wiring wrong and it's firing the injectors in the wrong sequence?

    Maybe this could be resoned because the injector timing cold is fired at a different time.

    Change B3702 and B3703 all to 2.55 and see if it will rev....
    If I'm reading this table right with temp increase the injectors wait longer to open. Wonder what GM's reasoning was for this? Faster burn rate when hot?
    2002 Chevy truck, SCSB 2WD, Stroked LS3 w/Big Mutha Thumper cam
    2002SS Camaro LS7/427 with stock suspension setup
    2012 Chevy truck, SCSB 2WD, Magnaflow exhaust + K&N

  10. #20
    Joe (Moderator) joecar's Avatar
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    Quote Originally Posted by 67SS509 View Post
    If I'm reading this table right with temp increase the injectors wait longer to open. Wonder what GM's reasoning was for this? Faster burn rate when hot?
    My understanding: when cold the sprayed fuel takes longer to evaporate; when hot it evaporates sooner.

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