3000GT/Stealth International Message Center - View Single Post - Lean Misfires at 2700-2800 rpm

DoctorDex · 11-02-2007, 03:24 PM

Well, disconnecting the SAFC-2 didn't work. If anything it made the problem worse.

Now thats it gotten colder out, I've noticed the rpm range where it misses has moved up in the rpm range a bit. Now it seems to miss most between 2800 - 3000 rpm (whereas before it was 2600-2800).

As an experiment, I left the SAFC-2 hooked up, but with the AF signal disconnected. After doing this, it would bog badly in the 2800 - 3000 rpm range @ part throttle. Upon entering the 2800 - 3000 rpm range, it would start to miss and if i held it at that rpm the missing would quickly get worse and worse and my AFR would eventually hit 18+. It almost seems like once it hits 2800 - 3000 rpm, unmetered air just floods the engine. However, I know this isn't true. I have no boost leaks and I even tried blocking off my PCV system today and it had no effect whatsoever. I suppose I could try blocking off my clutch/brake booster, but I highly doubt this will do anything. This has got to be some sort of fueling issue.

Oh yeah by the way, I pulled the ETACS unit and there are caps inside, but they aren't rubycon caps. Therefore I didn't change them because they looked good.

11-02-2007, 03:24 PM	#557 (permalink)
DoctorDex Forum Member Join Date: Jul 2005 Location: Edmonton, AB Drives: '91 VR4 - RIP Trader Rating: (14)	Re: Lean Misfires at 2700-2800 rpm Well, disconnecting the SAFC-2 didn't work. If anything it made the problem worse. Now thats it gotten colder out, I've noticed the rpm range where it misses has moved up in the rpm range a bit. Now it seems to miss most between 2800 - 3000 rpm (whereas before it was 2600-2800). As an experiment, I left the SAFC-2 hooked up, but with the AF signal disconnected. After doing this, it would bog badly in the 2800 - 3000 rpm range @ part throttle. Upon entering the 2800 - 3000 rpm range, it would start to miss and if i held it at that rpm the missing would quickly get worse and worse and my AFR would eventually hit 18+. It almost seems like once it hits 2800 - 3000 rpm, unmetered air just floods the engine. However, I know this isn't true. I have no boost leaks and I even tried blocking off my PCV system today and it had no effect whatsoever. I suppose I could try blocking off my clutch/brake booster, but I highly doubt this will do anything. This has got to be some sort of fueling issue. Oh yeah by the way, I pulled the ETACS unit and there are caps inside, but they aren't rubycon caps. Therefore I didn't change them because they looked good.