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  1. 01-08-2015 12:29 PM #1
    nettles
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    Exclamation help with a tuning questions

    okay, I have a question... I am at the point of starting the 5.3 and I am trying my hand at the HP Tuners software. I turned vats off and it fired right up but running rich is an under statement. I am using a PSI harness and all sensors are there except the rear O2s. I turned them to no error reported in the DTCs but still idling really rich!!!! Is this normal at first? It has not been driven only sitting there at idle.
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  2. 01-08-2015 12:39 PM #2
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    chvy=power
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    what injectors are you using? Are they aftermarket? If so do you have the right injector data? Are you running a MAF?
    2008 GMC Sierra SLE....370ci LY6 with some goodies SOLD
    1995 C2500- LS1 swap with a mp112
    build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
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  3. 01-08-2015 12:48 PM #3
    nettles
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    stock injectors, the whole thing is stock. And yes sir the MAF is there and plugged in!
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  4. 01-08-2015 12:54 PM #4
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    chvy=power
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    what happens when you run open loop? does it still run rich?
    2008 GMC Sierra SLE....370ci LY6 with some goodies SOLD
    1995 C2500- LS1 swap with a mp112
    build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
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  5. 01-08-2015 01:18 PM #5
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    chvy=power
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    and you have the right tune file in the pcm right?
    2008 GMC Sierra SLE....370ci LY6 with some goodies SOLD
    1995 C2500- LS1 swap with a mp112
    build thread- http://www.ls1truck.com/forums/lsx-t...-ls1-swap.html
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  6. 01-08-2015 01:20 PM #6
    nettles
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    Quote Originally Posted by chvy=power View Post
    and you have the right tune file in the pcm right?
    I have not done that and yea its the stock file from the truck it all came from.
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