SSblack98

iTrader: (8)

My car is running dead lean only at ldle. I searched but couldn't find anyone with the exact same prob. I dont actually tune the car but it is a turbo OFI 6.0L running '00 PCM w/EFILive custom OS and '02 PCM file. Everywhere else the car runs fine but cold start up and when hot its 18-20:1 AFR. Figure there is an adjustment in some table that we've overlooked.

Thanks for any advise.
Chad

Eurospec2

iTrader: (2)

20.1 is free air, pure oxygen, id be looking at what your using to take these readins more then the readings themselves.

2002_Z28_Six_Speed

iTrader: (19)

That would be AFR not % O2. The WB would have to tach way past 50:1 AFR before it started to read into % O2.

A gas engine can idle at 22:1 AFR. Just barely... Not good for it either.

His car was still idling. If the WB was going into % O2 it would have no chance of idling.

bigtymn

what size injectors what mods????

SSblack98

iTrader: (8)

60lb injectors but im running 75ish fuel pressure @ full boost so they're more like 75-80lb injectors, runs perfect off idle and, cruising and wide-open. Definitely plenty of fuel available. Running 10.8:1-11.3:1 WOT on 16psi. Soon as you give it the slightest bit of gas at idle the afr comes straight up to 14ish afr. Soons as it idles down after about 5 secs it goes to at least 18.5:1 then flickers to high 19:1 or even just says "LEN" cause I guess it doens't read over 20:1. Idles ok. I am running a PLX wideband that reads damn near exactly the same as my tuners LM1. Drives great, runs strong just don't like idling it that lean.

SSblack98

iTrader: (8)

Never tried that but I will. If it does or doesn't go lean while rolling in neutral what would that tell you?

I also forgot to mention it is tuned SD open loop. But I have been running it like that for 2 1/2 years long before the FI and never seen this problem.

2002_Z28_Six_Speed

iTrader: (19)

Sounds like you are doing what I am and my problem was related to sitting still and the temps increasing while sitting still.

Fortuntantely, many have been down this road. There are people to ask for advice.

Try checking out EFI-Live's forum:

http://forum.efilive.com/

SSblack98

iTrader: (8)

Its not IAT related for a number of reasons. The IAT is mounted within a foot of the intercooler outlet and reads almost exactly same as ambient temp while idling doesn't matter for how long. It is down in the lower front bumper so no chance of heat soak. Also, it does this 5-10 secs after cold startup so obviously no heat soak there either. I'll have a look around on the efilive forums though & see what comes up.

2002_Z28_Six_Speed

iTrader: (19)

They said it was my IAT and it doesn't get too high but the AFR goes lean.

Hope you get it figured out.

There are plenty of tables to play with. Decay rate and decay factors under the crank/start folder. Have a look at the additional restart enrichment and the Open Loop ECT commanded fuel multiplier table.

Souless

iTrader: (2)

I am having a similar problem. I am running at 18-21 AFR on startup in open loop. When it goes CL it runs 14-16. I have HPT and I know where to look for afterstart enrichment, just not sure what values to fiddle with. I hope I am not hijacking your thread, I would just like to figure this out too.

SSblack98

iTrader: (8)

Sounds like we have the same problem just mine never changes cause I run open loop all the time. I might try messing with the ect enrichment table. I've read where the base running airflow table can possibly cause this problem too but I think you have to adjust the desired airflow table after changing it and not sure about all that. Like I said before I don't do much of the tuning myself.

Souless

iTrader: (2)

Anyone else want to chime in on this one? We could really use the help.

Thanks

Chalky

iTrader: (2)

Are you running a MAF or SD?

A couple of things can screw you up. IAT as sensor heats soaks will drive AFR lean as car sees higher IAT temps. Also might wnat to look for any possible error in your CFOL.

Once you go into CL, is pcm adding fuel or do trims stablize close to 0?