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Old 06-27-2022, 05:15 PM   #1
Drives: Camaro SS
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2018 camaro SS Super Rich on WOT

Last weekend I dynoed my car Stock 2018 Camaro SS and I noticed the car was running very rich in the high 9s AFR. The car I brought second hand, I assume it has the stock tune. I was just wondering why the ECU is targeting the AFR so rich unless the car was knocking bad, or previous owner tuned the car and I am unaware. Because of this car was way low on power.
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Old 06-27-2022, 07:35 PM   #2

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Cat over temp?
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Old 06-28-2022, 11:42 AM   #3

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What is it doing in closed loop?
WOT is an open loop mode, and fuel map will usually err on the side of rich. But, agree, 9 is too rich.
Fuel trims?
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Old 06-28-2022, 12:20 PM   #4
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I will probably need to buy the MPVI to do some data logging and see what going on.
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Old 06-28-2022, 12:31 PM   #5
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Yeah, would want to see if commanded afr is actually that low, or that's just a side effect of say... a mechanical issue or misfire. Codes could have been suppressed if it was "tuned".
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Old 06-29-2022, 09:58 AM   #6

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Thats's way rich even for COT. I'd guess that the dyno's Wideband was incorrect. But you should also look at Long Term Fuel Trims and see if the car is adding a ton of fuel that carries over into WOT. LTFT's will carry over in to Open Loop WOT mode if they are positive.
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