Car Runs Lean at WOT regardless of MAP
Apr 15, 2011, 11:42 AM
#1
Car Runs Lean at WOT regardless of MAP
Guys, I'm pulling my hair out and I would like to keep as much as possible. Been working with a respected tuner, but no matter what changes are made to the MAP (such as super rich) the wideband continues to show low 13s at WOT. Log
Keep in mind my wideband has been working for over a year perfectly and I just replaced the o2 sensor in the hopes that was the problem. At idle and crusing, it reads perfectly fine at 14.7~. The only things done over the winter was add GSC S2 cams + Springs, Full Race Header, and cleaned out the cat.
What suggestions do you have that might be causing this or what I might try to fix this issue. I've already missed quite a few events and don't really want to miss many more.
Thanks
Tuning for 93 octane
Current mods: FP Black, Intake, GSC S2 Cams, Full Race Header, 1000cc injectors, 65mm Throttle Body, UICP & LICP, Buschur Race FMIC, 3" TB Exhaust, Cat in Place (but empty).
Keep in mind my wideband has been working for over a year perfectly and I just replaced the o2 sensor in the hopes that was the problem. At idle and crusing, it reads perfectly fine at 14.7~. The only things done over the winter was add GSC S2 cams + Springs, Full Race Header, and cleaned out the cat.
What suggestions do you have that might be causing this or what I might try to fix this issue. I've already missed quite a few events and don't really want to miss many more.
Thanks
Tuning for 93 octane
Current mods: FP Black, Intake, GSC S2 Cams, Full Race Header, 1000cc injectors, 65mm Throttle Body, UICP & LICP, Buschur Race FMIC, 3" TB Exhaust, Cat in Place (but empty).
Last edited by metalsaber; Apr 15, 2011 at 11:48 AM.
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Apr 15, 2011, 02:45 PM
#8
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fuel pump going bad? bad fuel pump relay? Injectors not flowing properly? FPR not holding correct fuel pressure?
Evo X's had the same problem but it was the fuel pump relay that needed to be replaced. It probably has nothing to do with your tune. Its probably mechanical.
Evo X's had the same problem but it was the fuel pump relay that needed to be replaced. It probably has nothing to do with your tune. Its probably mechanical.
Apr 15, 2011, 03:48 PM
#12
'm going to attempt a check of the fuel filter tomorrow. I saw another thread similar to mine which they found the filter to be pretty dirty and clogged up.
Unfortunately I have no way to check fuel pressure.
Just as a question:
If injectors/pump/filter were the issues wouldn't/would I notice sluggishness/sputtering when going WOT?
Last edited by metalsaber; Apr 15, 2011 at 03:56 PM.
Apr 16, 2011, 01:02 PM
#14
If a pump is going out one of the first clues could be car going lean at wot. Basically pump can not keep up with demand. I have not really seen fuel discolor a pump. However I have seen bad gas have microbiological growth in it and that turns everything black.
