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how do you know you are not going open loop?

What do your stft's read at idle?

yeah I looked at your tune, your closed loop enable temps are still set for stock, so probably whats happening is your go into closed loop and the pcm then starts making corrections using stfts. ...

can you unplug the MAF? Thats what I did to make sure it wasn't being used.

You are probably going into closed loop when your fuel trims come on. Its also possible that even though you failed...

whats your fuel trims doing, for whatever reason they show blank in the scan.


Also how big of a cam?

I don't know how much it would help you but your spark sure is jumping around alot, use the idle overspeed/underspeed tables as well as the main spark tables to get your spark where it needs to be...

I don't think they need to be exactly 0'd out cause even from day to night the air quality changes, I found the VE was hard to tune in but the MAF was pretty easy, you just gotta get it close and...

is it the throttle follower or the throttle cracker he wants to mess with?

for me I didn't have to alter Cranking VE at all, I don't see why you should have had to either to be honest. Did you make sure and disable fuel trims when you tried the open loop stuff?

Well it reads the VE and the MAF to calculate whatever it believes is how much air is in the cylinders, if you disable the MAF it reads only VE, if you disable the VE it reads only MAF which is...

the way I look at VE is that it is a percent of air in the cylinder, I know its a simplton version but it works for me. If you raise the table the car thinks there is more air in there and thus...

just start lowering the VE table slowly, do like 2 percent at a time until it idles right, you can also use the live controls at idle to set commanded AFR



also if you have a big cam consider...

I see your thinking but that isn't right imagine at higher rpms do you want it to squirt less fuel then also?, tune the VE and the MAF, then if still having problems use open loop idle.

and why is this not a sticky? Seriously this can help anybody with idle issues IMO cause you can fine tune the a/f this way without worrying about trims and proportional fueling.

more than likely he is rich, do a search on Russ idle config, also search on open loop at idle.

Also here is a good place to start for idle tuning
...

yeah what sucks is when I was first trying it I was thinking it wasn't going into open loop at all, I almost gave up on open loop at idle until it finally donged on me.

yeah I did, thanks for this thread also btw, there was no other way to get my cam to idle and keep closed loop, I am starting to feel as though the car is streetable again.

yeah you can changed the closed loop fueling its under fuel/general

then its stoich afr right at the top left.



Also to answer my own question after doing some testing,, those o2's can...

Here is log.

I have been battling this open loop at idle thing for some time now and after doing some reading/logging/ tuning over and over again I came to the conclusion that the closed loop status bit is not...

I got it to work, its pretty awesome, no more surging, what I did find though is that you can't trust the closed loop status bit, When I was at idle my fuel trims all stayed at 0 which made...

found another thread where MNR says to disable these codes so it must be somewhat normal to get them after trying this.

http://www.hptuners.com/forum/showthread.php?t=7591&highlight=p0131

I'm a newb so some of the other guys may have a better explanation. But prop fueling is what makes the narrowbands switch voltage up and down around stoich 14.7 it uses the o2 switching to add fuel...

yeah but I found that the issue was my DTC's and I found another thread where MNR said to turn those exact ones off.


http://www.hptuners.com/forum/showthread.php?t=7591&highlight=p0131

ok after making the changes I am getting p0131 and p0151 codes low voltage to my 02's hmmmmmmm

I made all these changes and I can't get the car into closed loop at all, why would this be? Have you guys that made this changed logged to see if you ever go into closed loop when cruising?