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Air/Fuel mixture problem.

1170 Views 11 Replies 9 Participants Last post by  marclar
I´m started to having this problem since my intake was installed. Or hmmm maybe even before that. When I test my computer it showes that O2 says that mixture is lean.
While it´s idleing it´s producing water that dripping from my exost. While I´m driving everything is fine first 15 minutes (after computer codes were reseted) After that car starts to missfire in 2000-3000 rpm range. I can really feel it when I´m driving on 5th gear. After about hour of driving car starts being realy rough and it feels like I´m missing power. After the driving there is a black powder on my x-ost tip and little bit on the bumper meaning that I was running rich. Car has custom cold-ram air intake. swaped 3.8 TB ported polished and matched intake manifold. O2 is original and was never changed. I just wonder is it could be a O2 problem or I need new set of performance injectors and preasure regulator.???
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OK.. I think I fixed it. First I´ve got new O2 sensor. It helped but not that much. So I went trough my knowledge brain database and find out:))) that last think it could be is Coolant temperature sensor. Becasue It´s responsible for mixture regulation according to temperature of the engine. Ok I installed that. It stopped really bad missfire. But still I had some lose in performance. And I look around my engine bay and sudentlly all bad stories about Accel coil pack came back to me. I took this crup out and I put my original coil pack. It helped dramatically. My car was almost runing good. After about hour driving I realized that my computer is calibrated to my old MAF and new one that I got with bigger MAF housing could be calibrated differently. I stopped and put my old MAF on. All problems dissapeared. So the final thing is DON´T EVER BUY ACCEL STUFF. IT´S GARBAGE!!!! I had that pack on for less then 3 months,!!!
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