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Thread: lq4 wont run above 1500 rpm!! help

  1. #1
    Tuner in Training
    Join Date
    Aug 2009
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    10

    lq4 wont run above 1500 rpm!! help

    well guys this is my first gas tune so bear with me. I have a 04 lq4 with tsp 228r cam on 114 lsa and 42 lb green top injectors. Im using a 2000 5.3 pcm and fuel system. i flashed in a stock 2002 6.0 tune for a base (couldnt find a 2000 but 2002 still used return style fuel system) and adjusted IFR for the injectors. I upped the idle a bit for the cam and deleted vats but thats it. Im just trying to get it running so i can drive it and tune it right. every time i try to rev it it falls on its face at about 1550 rpm. sounds like it isnt getting fuel. I thought maybe the tps was bad but when i scan it, it shows its working fine. I dont know what other sensor or part of the tune would cause this. im going out rite now to check fuel pressure. heres a copy of my tune. any help would be awesome.
    Attachment 19682

  2. #2
    Tuner in Training
    Join Date
    Aug 2009
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    10
    i also returned the timing tables to stock on the above tune

  3. #3
    Potential Tuner
    Join Date
    Apr 2007
    Location
    Wellington, New Zealand.
    Posts
    6

    Torque Management.

    Major newbie here but since no one else has offered anything.. :-)

    I had a similar prob. I found that Torque Man. abuse was cutting in at 1400 RPM. That was how it came from the supplier of PCM and loom.

    Hope this helps.
    Simon
    Hehe. Just noticed your tune file.. Yep. Torque abuse looks similar ot mine did. Yours i set to 1600 RPM kick in...
    Last edited by SlySi; 08-25-2009 at 05:53 AM.

  4. #4
    Advanced Tuner 69lt1bird's Avatar
    Join Date
    Oct 2007
    Posts
    983
    Does it cutout revving in park and neutral while stopped or while driving?
    Free HP Tuners Beginners Tuning Guide

    LS1 Tuning Guide
    Michigan Snowmobiler

    1969 Firebird: 11.67@114 [email protected] 1/8 1.70 60 ft. EPS cam 234/246 .602.606 114+3, 6.0 LQ4, L92 heads milled 10.5:1, Ported L76 intake, ported 90mm Holley TB, 100mm MAF, FIC Custom injectors, Hooker LT, PYPES dual exhaust with an X pipe, 4L65e with all of the good parts inside, FTI 4000 RPM Stall, 12 bolt with 3.73 gears. HP Tuner tuned by me

  5. #5
    Are you running cable or dbw throttle? If you are running a dbw throtle, the 02 and older tunes won't work stock since they had cable throttles.