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Discussion Starter · #1 ·
hey,
I have a 04 is300 56,000 miles with headers, exhaust, intake and a apexi a/f pb.
I have owned the car for a year with all the mods before cel came on
I havent tuched the pb since i got it adjusted right .
IChecked the code and reads bank 1 system lean.
Ive since added lucas injector cleaner and didnt help.
I was thinking i will check maf and if not that fuel filter.
(any body know signal voltage at idle for maf and also the fuel pressure at idle and or 2500rpm)

Little more about headers- person put sensors all on one tube and one 02 is not being used its confusing to me what they did. if pictures help i can put some up.
 

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Discussion Starter · #5 ·
cel turned off today!! not sure exactly what it was i did an oil change a couple days ago hmmm. oh well im happy :)
 
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