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Menifee/Murietta/Temecula Vehicle Tuning - Ride along, not Dyno

Discussion in 'RD's Lounge' started by evantwheeler, Oct 7, 2019.

  1. evantwheeler

    evantwheeler Well-Known Member

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    I have a 1999 CCSB GMC 2500 with a Vortec 454. Engine needed head gaskets shortly after I bought it and I traveled down a wormhole and ended up putting in a balanced Scat stroker crank and rods, Racetec pistons with a minor bore enlargement along with a Lunati towing cam. Rebuilt the stock crappy vortec heads as it was an occasional tow rig but was not looking for a high rpm screamer. I had the computer tuned by Wester's Garage out of Alberta Canada as they had high remarks from the GM truck forum members. Computer went back and forth a couple times and it's still not right. I got fed up and stopped dealing with it as I drive a work truck 99.9% of the time. I think it's getting too much fuel. It idles fine, but dies when put into gear. Seems upon restart it is flooded. Driveability is fine, but I think due to the tune it is going though a lot more fuel than it should be as it is getting 7-8mpg unloaded in daily driving duties.

    I bought a new to me truck and need to get this one ready to sell. I know it won't pass smog in CA as it sits now (truck is currently registered in WA as that is where I bought the truck and built the motor) and am looking for someone local to me in Menifee/Murietta/Temecula that can do a ride-along tune to get the computer dialed in before I try to smog it for local sale. I have HP Tuners and I know that it can be used to tune this ECM, but I don't know the first thing about tuning.

    Thanks,

    Evan
     
  2. rivermobster

    rivermobster Club Banned

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  3. BajaMike

    BajaMike Well-Known Member

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    With all the modifications you have done, I think it would be hard to diagnose a problem.....but a good mechanic who knows the tuner should be able to figure it out.
     
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  4. evantwheeler

    evantwheeler Well-Known Member

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    Thanks for the response. HPTuners says it will, from their supported vehicles list:

    98-00 Sierra 5.0, 5.7, 7.4

    I was able to do a data log and can connect and monitor the ECM live while driving with my computer and software. Just don't know or care how to learn to tune at this point in my life.
     
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  5. evantwheeler

    evantwheeler Well-Known Member

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    I'm quite sure its a fueling issue. Either the tuner setup the tune with the incorrect injector info, or I was given the wrong info from the supplier of my injectors. The ECM is constantly trying to pull fuel (fuel trims are negative in the 10-15% range from what I recall). I've read that injectors with the wrong impedance can cause issues. If a ride along tune can't fix it, then I'll start throwing parts at it. No reason to put it on a dyno in my mind, if it was going to blow up due to a bad tune, it would have done so by now!
     
  6. motormonkey

    motormonkey Well-Known Member

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    Plug in HP tuners and show us a screen shot.
     
  7. rivermobster

    rivermobster Club Banned

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    Cool.

    It's something you have to work with everyday to get good at...

    Kinna why we just hired someone! :D

    Good luck!
     
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  8. bldrinker

    bldrinker Well-Known Member

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    Take it to CBM or Danzio
     

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