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Thread: TBI Chips .com help! i need a drivable truck soon

  1. #1
    Fuel Injected! kingcat400's Avatar
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    TBI Chips .com help! i need a drivable truck soon

    I have a 1995 chevy k1500 with a 5.7 and 4l60e.
    in june i started installing my new motor. a Gm 350hd vortec creat motor. i had a gmpp zz4 cam put in and the cam is advanced. the motor has a 46mm bored tbi and stock 350 injectors at 18psi in a afpr with a 96 k1500 fuel pump. the truck has a set of shorty headers and with a 2.5" mandrel bent y pipe with no cat feeding a summit racing 3" cat back system.

    now onto my issue. i bought a custom TBI chip for the truck from TBIchips.com (i know) in hopes it would be good on the first chip. i am now on the second chip and the problem is the same. the truck idles good but when you go wot below 2000rpm it bogs to about 100-200rpm and has a 2 sec delay then starts to pull. i have sent brian 2 data logs and he said he doesn't really see anything wrong. he told me he made an adjustment to the only thing he seen wrong but that just made it worse.

    here are the 2 logs i sent him. the first is with 2 bad plugs and the second is with all new plugs. the files a from tts datamaster 0D.

    EDIT: See results of a good TBI Chip tune in post 54
    http://www.gearhead-efi.com/Fuel-Inj...ll=1#post24788
    Attached Files Attached Files

  2. #2
    RIP EagleMark's Avatar
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    Fuel is close enough to not be an issue.

    You have 2 error codes 33 and 42 that should be cleared, then rechecked.

    Spark advance at idle is only 10 to 12 degrees and with that low a MAP it could be much better with more advance.

    The bog your experiencing is usually fixed with added AE Acceleration Enrichment.

    You wouldn't be the first guy here with a bad running built motor tuned by TBI Chips .com

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  3. #3
    Fuel Injected! jameslleary's Avatar
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    Hey Mark...vortec heads... Maybe it would be advantageouse to start over using BNKM?

  4. #4
    RIP EagleMark's Avatar
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    Sure would be better spark table... but we have no idea what is used now? Idle spark is way to low... rest not bad...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  5. #5
    Fuel Injected! kingcat400's Avatar
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    so do you think i should try more base timing as a start. it is currently at 2 degrees advanced.

    could you explain what AE does?

  6. #6
    RIP EagleMark's Avatar
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    No more base timing because if it is not accounted for in chip you can be over!

    AE adds fuel when throttle blades open, like a carb has an accelerator pump. More fuel compensates for more air until stable.

    Bring it to my house and I'll fix it!

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  7. #7
    Fuel Injected! kingcat400's Avatar
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    will you pay the gas bill? lol

    ok i will leave the timing alone. i reset everything today and i will get another log tomarrow with the newest chip. i noticed that the one code was ignition related. could it be the module in the dist?

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    RIP EagleMark's Avatar
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    DTC 42 is EST but also comes up when setting timing. This is why you should clear them and recheck. Not sure why you got 33? Check vacuum line, MAP sensor and wiring if it contiues.

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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  9. #9
    Fuel Injected! kingcat400's Avatar
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    here is the datalog i did this is chip 2. chip 3 is on the way

    Attached Files Attached Files

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    RIP EagleMark's Avatar
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    DTC 33 is gone so that's good. But DTC 42 is still there? Looks like more timing at idle so if you disconnect bypass wire and set timing you need to clear codes. Is CEL on ?

    Fueling is in ballpark of correction. So adjusting VE fueling is not going to help your issue.

    If I had only 50 MAP at idle and 10 to 15 degrees timing? I'd have more timing at idle and usually higher MAP. Do you have idle issues?

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  11. #11
    Fuel Injected! kingcat400's Avatar
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    idle is good with an ocasional stumble every few min. i had set the timing back at 0 so ya the plug was undone but no cel.

    the next chip is in the mail and he said if 2 made it worse at least he knows to go the other way and that 3 will be good and all the issues will be gone. but im not holding my breath. but i hope he proves me wrong

  12. #12
    Fuel Injected! kingcat400's Avatar
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    well chip 3 is in and,


    holly crap this things runs like crap. under 2k if you touch the gas it bogs. i hope to send him a log tonight and i will post it here also. this is gettin rediculas each chip is getting worse.

  13. #13
    Fuel Injected! kingcat400's Avatar
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    just got off the phone with a guy that does obd2 tuning and he said he can tune it but i will need $500+ in equipment and software and also a minimum of 4 hours of dyno time. he told me i will have over $2000 in the computer and dyno time to get the truck to run right. he told me that the best way to go is to rip it all out and go to a fast or holly self tuning system. is this true or a load of crap?

  14. #14
    RIP EagleMark's Avatar
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    Quote Originally Posted by kingcat400 View Post
    this is gettin rediculas each chip is getting worse.
    Ask him what he is changing each chip? It will give you an idea of what is being adjusted the wrong way. Your problem sounds like lack of AE, it is with a stock chip and your engine mods. But now it sounds like to much AE!

    Quote Originally Posted by kingcat400 View Post
    is this true or a load of crap?
    Most guys tune those in person for $250. So you decide if it's a load of crap...

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  15. #15
    Fuel Injected! kingcat400's Avatar
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    eagle would you do it over email/mail if i got the program and the thing that lets you tune straight from the laptop to the computer?

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