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Thread: What is your idle AFR??? My car wll not idle?

  1. #1
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    Default What is your idle AFR??? My car wll not idle?

    My car used to idle with an AFR of about 11:1. Now I leaned it out to about 13:1 and it will not idle anymore. I tried taking air from the IAC in park/in gear and it did not change??

    Any advise? Kind of embarrasing having an 800 hp car that will not idle!! :oops: :(
    '71 chevelle
    Twin turbo ls1
    1000 HP 93 octane street car!
    96 lb injectors

  2. #2
    Senior Member dissonance's Avatar
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    Are we talking warm up? Or normal idle? I was messing with my ve tables today and noticed with the stock ve +15% "mafless at the time" and my car was idling at 17:1 with no problem...

    I think warm up afr is some place around 13.5:1 "stock" and maybe 12.5:1 on a colder start. So it should idle fine @ 13:1... Sounds like something else maybe wrong and adding more fuel is keeping the car running.

    What kinda timing are you running at idle? I don’t know a lot about FI so it maybe related to that or the idle afr should be something different then an N/A car.

  3. #3
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    I cannot remember for sure. But I think it is at about 22 degrees at idle. I would have to look for sure. I got the timing tune from Wait4me. It idles better with his idle table then the stock, with the stock it roamed. But after I leaned out the idle, it just dies. I guess I just have to keep messing with it. I just wish I new exactly wich direction I should go with certain things.
    '71 chevelle
    Twin turbo ls1
    1000 HP 93 octane street car!
    96 lb injectors

  4. #4
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    Default Re: What is your idle AFR??? My car wll not idle?

    Quote Originally Posted by nitrorocket
    My car used to idle with an AFR of about 11:1. Now I leaned it out to about 13:1 and it will not idle anymore. I tried taking air from the IAC in park/in gear and it did not change??

    Any advise? Kind of embarrasing having an 800 hp car that will not idle!! :oops: :(
    I'm not sure exactly what you mean when you say AFR. When you say the car would idle at 11:1, do you mean comanded or actual?

  5. #5
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    11:1 AFR(AIR FUEL RATIO). That was actual AFR. Commanded is 14.7:1.
    '71 chevelle
    Twin turbo ls1
    1000 HP 93 octane street car!
    96 lb injectors

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