Help me figure my idle and AFR problem.
#24
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#25
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Here's a couple things that I do know. The intake could be leaking pre turbo, but my vacuum holds steady a 19. After turbo I highly doubt it. I have the pcv routed with a sealed catch in the line. The breater on the drivers side is hooked up with a catch venting to the atmosphere. I removed that air valve that is attached to the intake manifold right above the fuel rail (I had this problem before that). My exhaust probably is leaking before the wideband O2.
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#26
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Im starting to think that my best bet is ignore these problem until I get my ms so I can remove the maf and until I get my new exhaust in a couple of weeks.
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#32
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Back on subject, anyone have any other ideas?
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#33
I'm going to go out on a limb and say that your wideband is lying to you. There's either a missfire, a calibration issure, or you have a leak in your exhaust and it's sucking air. I don't think it's possible to have a smooth idle running that lean. Cold start would be a bitch if it's anything near 16:1.
#35
If the idle is raising up then I'd suggest an air leak on the intake manifold which would make it run lean and raise the idle.
When you removed the air valve, how did you cap the hole off that was left behind?
If there's a leak post AFM/MAF and before the throttle body then it would run pig rich when driving around but possibly not when idling if it can drag enough air in via the intake manifold.
Worth checking those things anyway - also stick a jumper between TEN and GND in the diagnostic connector. This will bypass the ISC control from the ECU and allow you to check the base idle properly - it should be about 850rpm without any assistance from the ECU.
When you removed the air valve, how did you cap the hole off that was left behind?
If there's a leak post AFM/MAF and before the throttle body then it would run pig rich when driving around but possibly not when idling if it can drag enough air in via the intake manifold.
Worth checking those things anyway - also stick a jumper between TEN and GND in the diagnostic connector. This will bypass the ISC control from the ECU and allow you to check the base idle properly - it should be about 850rpm without any assistance from the ECU.
#36
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If the idle is raising up then I'd suggest an air leak on the intake manifold which would make it run lean and raise the idle.
When you removed the air valve, how did you cap the hole off that was left behind?
If there's a leak post AFM/MAF and before the throttle body then it would run pig rich when driving around but possibly not when idling if it can drag enough air in via the intake manifold.
Worth checking those things anyway - also stick a jumper between TEN and GND in the diagnostic connector. This will bypass the ISC control from the ECU and allow you to check the base idle properly - it should be about 850rpm without any assistance from the ECU.
When you removed the air valve, how did you cap the hole off that was left behind?
If there's a leak post AFM/MAF and before the throttle body then it would run pig rich when driving around but possibly not when idling if it can drag enough air in via the intake manifold.
Worth checking those things anyway - also stick a jumper between TEN and GND in the diagnostic connector. This will bypass the ISC control from the ECU and allow you to check the base idle properly - it should be about 850rpm without any assistance from the ECU.
When I removed the air valve I put a metal plate with cork gasket to seal the hole. There is a good chance that there is a leak post maf before the turbo. If there is im not gonna bother with it as im waiting for my MS to come.
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#39
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well before I went to get some lunch I played with a couple things. I readjusted the idle at the TB and at the MAF. I test drove the car with the IAC disconnected but the idle was too high. I reconnected it and readjusted my idle. My AFR's look better but im actually very rich at WOT now 11-10. Cruise remains at 14-16 and light throttle around 13. My idle is still very lean 15.5-16. I dont really mind that because it idles fine. I just wish there wasnt so much flutcuation. Like I said earlier, once I get my MS and new exhaust, I will be able to rule out any leaks.
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#40
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well the stock computer is still fueling based on the NB o2....so it will sweep around....
btw, ill have your MS shipped monday. i wanted to throw it on my car this weekend before i shipped it out to make certain everything was functional.
btw, ill have your MS shipped monday. i wanted to throw it on my car this weekend before i shipped it out to make certain everything was functional.