Rich AFRs with electronic load?
I've battled idle issues for 5 years. This passed weekend I finally sorted out why she NEVER idled with a cold motor, only once warmed up to temp. Idle AFRs have always been jumpy when warm, generally hovering around 14.6 where they should but randomly drop to mid-13's...and then back up. So over the weekend I figured all would be well, I was wrong.
AFRs still do as just described but once warm and driving, when I stick the clutch, idle drops to around 1,000. It then bounces up around 1,500, back down to 1,000, and will hover there for sometimes seconds, sometimes minutes, before finally resting at 800 where the tune is set. Doesn't seem to be a rhyme or reason for the idle. I know the RPMs naturally hover before settling but this strikes me as odd.
The whole time this is happening the AFRs are all over the place, assumably the o2 is struggling to do it's job. Whether the AFRs are mid-13's or mid-14's, electronic signals will fatten the AFRs. At a red light with my foot on the brake, AFRs dropped. They jump back up when I release the brake. To the extreme I had my foot on the brake, radiator fan was going, radio on, and I turned on the defroster full blast....AFRs dropped as low as 11.9! With each electronic signal I watched AFRs drop a little more. Why?
Is this mechanical or tune? My tune is a little rich to begin with.
I can produce video if y'all would like....or maybe I'll just go do that while this posts.
Thanks
EDIT: I'm running Calum RealTime, b13, t25, 555's, s4's, fidanza, z32 MAF, srt-4 FMIC
AFRs still do as just described but once warm and driving, when I stick the clutch, idle drops to around 1,000. It then bounces up around 1,500, back down to 1,000, and will hover there for sometimes seconds, sometimes minutes, before finally resting at 800 where the tune is set. Doesn't seem to be a rhyme or reason for the idle. I know the RPMs naturally hover before settling but this strikes me as odd.
The whole time this is happening the AFRs are all over the place, assumably the o2 is struggling to do it's job. Whether the AFRs are mid-13's or mid-14's, electronic signals will fatten the AFRs. At a red light with my foot on the brake, AFRs dropped. They jump back up when I release the brake. To the extreme I had my foot on the brake, radiator fan was going, radio on, and I turned on the defroster full blast....AFRs dropped as low as 11.9! With each electronic signal I watched AFRs drop a little more. Why?
Is this mechanical or tune? My tune is a little rich to begin with.
I can produce video if y'all would like....or maybe I'll just go do that while this posts.
Thanks
EDIT: I'm running Calum RealTime, b13, t25, 555's, s4's, fidanza, z32 MAF, srt-4 FMIC
Last edited by 93specv
on 2013-06-20
at 21-32-45.