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Thread: strange commanded afr change?

  1. #1
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    strange commanded afr change?

    look at log frame 100 to frame 101 at the commanded afr the car is going to wot with correct afr then it goes back to 14.63 which is the commanded afr that changed.. I cant find a reason why.. any ideas what would make the commanded afr go back to 14.6 under wot.. don't see anything in tune... it had been previously tuned by someone else... came to me with the problem..... also same car if left in drive shifts into second at wot.. then instantly into 3rd then 4th.. you have to shift car manually to make a pass. ive redone the trans shift numbers with bluecat numbers and see no reason it should shift early into 3rd then 4th.
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    67 camaro 6.0lq4 turbo build in process
    89 mustang coupe ls1 80mmturbo, holley dominator efi on e85
    02 lexus is300 lq4, cam,headers,fast 92 intake
    and no there isnt anything in my yard unmodified

  2. #2
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    Log WOT TPS voltage. See if it is exceeding 4.7V. If it is it will cause weird stuff like you are describing.

  3. #3
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    Quote Originally Posted by 2xLS1 View Post
    Log WOT TPS voltage. See if it is exceeding 4.7V. If it is it will cause weird stuff like you are describing.
    ok thanks
    67 camaro 6.0lq4 turbo build in process
    89 mustang coupe ls1 80mmturbo, holley dominator efi on e85
    02 lexus is300 lq4, cam,headers,fast 92 intake
    and no there isnt anything in my yard unmodified