Oscillating AFR at Idle with AC
10-22-2018, 09:18 PM
#1
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Oscillating AFR at Idle with AC
Hello everybody.
Cutting straight to the point, I have my afr's at idle pretty rock stable at 14.7 when warmed up. When I turn the ac on things seem to get wonky. I am attaching a short length datalog at idle as well as my latest tunerstudio tune. Would anyone have any idea as to why my afr's seem to be erratic when my ac is on?
For reference, my car is a 92 on a ms3pnppro and I have it converted to sequential fuel and I am running Nigel's 380cc flowforce injectors. I honestly don't remember if I had this issue before I switched to Nigels injectors and using ac. Since upgrading to his ev14 injectors my entire fuel map has had to be redone.
For all times relevant to the data log, the throttle pedal was not touched.
Cutting straight to the point, I have my afr's at idle pretty rock stable at 14.7 when warmed up. When I turn the ac on things seem to get wonky. I am attaching a short length datalog at idle as well as my latest tunerstudio tune. Would anyone have any idea as to why my afr's seem to be erratic when my ac is on?
For reference, my car is a 92 on a ms3pnppro and I have it converted to sequential fuel and I am running Nigel's 380cc flowforce injectors. I honestly don't remember if I had this issue before I switched to Nigels injectors and using ac. Since upgrading to his ev14 injectors my entire fuel map has had to be redone.
For all times relevant to the data log, the throttle pedal was not touched.
Last edited by andym; 10-22-2018 at 09:43 PM.
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10-22-2018, 11:42 PM
#3
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Join Date: May 2011
Location: Miami
Posts: 559
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I think I fixed the issue. I removed the intermediate harness I made for my TPS and went back to the stock chassis harness and re calibrated in tuner studio my vtps. Problem went away. I think I might have flipped my +5 and ref wires. Will investigate that in the future.
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