Jenson

iTrader: (32)

Im about to pull my hair out on this one. Hoping that a fresh mind will just point out some stupid little thing Im over looking.

According to my scan, bank one is 890, and 2 is 960. I can lean out everything, and bank 1 gets more lean but 2 does not. Ive gone as far as 17 on partial throttle and commanded 15 at wot, but my wideband still says 12.0-11.5 at wot once it enters PE. Im running an SD tune and right before the transisiton (have it set at 4K rpm) its 13.5 afr. Im running 31* timing with no knock, stock 28lb's hitting 98% at 6800, racetronix pump and hotwire kit.

My new thought is to turn off closed loop, pull the factory O2's and switch the wideband over to bank one and see whats really going on. Any help is much appreciated.

gectek

iTrader: (2)

HPT or EFI Live? Post tune and scan is the easiest to do.

rmata

iTrader: (34)

Ignore the o2 voltages and just tune the WOT off of your wideband. Also, I doubt you need that much timing. Try backing it down to around 28 degrees and get your fueling right. Are you using an operating system that has a primary and a secondary VE? If so, make sure you are copying the primary over to the secondary or you aren't going to see any of the changes you make. Closed loop is disabled at WOT so turning it off won't make a difference, unless you have LTFT still enabled and you are running very lean at part throttle. Then the computer is going to "think" you are going to run very lean at WOT too and dump extra fuel at WOT just like it did at part throttle to correct for your commanded AFR

Jenson

iTrader: (32)

HPT, I'll try to do a scan today. That makes a lot of since rmata, I was adding timing to try and get it to lean out or knock or something, anything, other than 12.0. Im pretty certain the 01 pcm only has one VE table, I could be wrong though.

joecar

What happens when you swap the O2's between banks...?

Also, are you sure it's in SD (is a MAF DTC present/current...?)...?

Jenson

iTrader: (32)

I dont have a bung on the other side, hence killing CL and the O2's just so I can see whats going on over there. I realize now what you meant by OS, Im still using the really old serial crap HPT. Cant justify buying EFI live yet. Here's a log in 3rd gear and my current tune. A little lower on the timing, and some KR in there a little, thats new. I guess my inj are maxed out...could have sworn they were under 100. Please just tell me Im dumb and switch this or that off and I'll be a happy camper.

gectek

iTrader: (2)

Just because you turn the maf code off does not mean its in SD. There are quite a few more things you need to change.

Jenson

iTrader: (32)

I honestly can't remember all the steps as I made a base SD years ago, I know its a lot more than disabling the dtc though. You could be a lot more helpful than that though. I'm about to just disable PE as it runs great before it switches over

gectek

iTrader: (2)

I could be more helpful yes, but everyone has their own ways of tuning. You have not told us your complete setup, so to say one thing or another is hard to do without any of that.

bad6as

iTrader: (17)

My car did this too. The one bankwas going full rich. The 02 sensor was bad. The only time it wouldent spudder is when I went in to pe. Boy that was a quick ride home lol. Turn off the front 02s and see how it does. Watch the a/f on the wideband thoe

joecar

Try this to see if it is the O2 sensor (i.e. problem swaps sides).

Jenson

iTrader: (32)

Isn't there only one right way to make it run in SD though? 228/232-110 cam, ported 241's, qtp LT's, ORY, 6 speed, no maf. No idea why I didnt think to just swap O2's...

SSpdDmon

iTrader: (10)

Might also be worth checking the coil packs to make sure you're getting spark...just a thought.

Jenson

iTrader: (32)

Good point, could have a dead coil. Didn't get to try anything today, put the turbo back on my truck and finally made it run again. Now I'm paying "The Man" so people can sit at home and not work

joecar

Be aware of this:

a misfire allows unburnt fuel/oxygen out of the combustion chamber... the O2 sees the unburnt oxygen and registers lean

[ i.e. raw unburnt fuel does not cause the O2 sensor read rich ]

gectek

iTrader: (2)

Yes. SD means the maf has no input. Meaning that the maf tables should be zero'd and the VE fail should be turned up. Those are a few places to look first.

Jenson

iTrader: (32)

I am trying to be as dumb/naive as possible here, to try and sort this thing out. As I was laying in bed thinking about it, I realized there was no way it could be a coil. As you stated joe, it'd be lean not rich. I'm going to check my maf tables and VE fail, if those dont do it I'll crawl under there and swap O2's around. Ya'll have a great easter

rmata

iTrader: (34)

Have you even bothered doing what I suggested? Ignoring the o2 sensors and just using the wideband to tune WOT? Your o2 sensors are never going to match each other at WOT and they don't affect fueling calculations at WOT anyway. PE will always be in Open Loop. So put the car in open loop, drive around and make any corrections to your VE table that might be off according to your wideband, and then do the same for WOT. Then when you get the AFR you commanded at WOT, you can put the car back in closed loop and look at the fuel trims and o2 voltage while you are driving around. If bank 2 is reading higher than bank 1 at "STOIC" (not WOT) or if one looks more lazy then the other then you'll know if you have a bad o2 sensor. And before you replace it, look for any exhaust leaks.

Jenson

iTrader: (32)

Yea I always tune it according to the wideband. I just cant seem to make it go lean or do anything other than the 12.0 at wot. And it just so happened that the bank the wideband is on is also the one that the narrowband is also super rich. I will do that as well, right now.

rmata

iTrader: (34)

12.0 is close. Take out around 5% of fuel and see what that does for you...multiply the VE in the WOT regions by .95 to do this