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  1. #1 heat changes tune 
    Donating Users gtpsleeper's Avatar
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    Been tweeking some stuff and have noticed my car runs perfect with the heat off but if I turn it on it runs like 2.0 richer? This ever happen to anyone else?
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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  2. #2 Re: heat changes tune 
    GXP Level Member Poil336's Avatar
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    that's weird...

    you don't think your thermostat's a little stuck and the heat is dropping the coolant temp enough to make the pcm go to open loop do you?
    99 GT - top swapped, S2X cam. - sadly, sold
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  3. #3 Re: heat changes tune 
    GTX Level Member OH4CompG's Avatar
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    Does it stay that way? When the AC compressor kicks on it adds load to the engine, that could cause it
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  4. #4 Re: heat changes tune 
    Donating Users gtpsleeper's Avatar
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    Quote Originally Posted by Poil336 View Post
    that's weird...

    you don't think your thermostat's a little stuck and the heat is dropping the coolant temp enough to make the pcm go to open loop do you?
    I tune/run in open loop so I dont think its a temp thing


    Quote Originally Posted by OH4CompG View Post
    Does it stay that way? When the AC compressor kicks on it adds load to the engine, that could cause it
    it stayed this way for the entire 10 min drive home... the thing that bothers me is that it was literally a constant 2.0 richer all across my maf frequency even in WOT...
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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  5. #5 Re: heat changes tune 
    GXP Level Member darkhorizon's Avatar
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    fuel pressure?

    There is basically nothing that can throw things off that much.. Your commanded afr is staying in the 15/16s right?
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  6. #6 Re: heat changes tune 
    Donating Users gtpsleeper's Avatar
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    command isn moving dark... Ill check out the pressure on the way home tonight...
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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