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From my earlier write up that you mentioned, I should say there are a lot of other things to look at before messing with the IAC. You should be able to get it running pretty good by reducing fuel...

I will definitely give that a try. Thank you.

Here are the latest adjustments. I have yet to post a tune here, I hope I did it correctly.

76860

Anyone? Or can I just add this the list of reasons why I hate dealing with Fords?

The really funny part is, I also own a Mustang, but that was because my wife wanted one real bad. I'm not about...

I've been helping a friend with his 2007 Mustang GT. It's a manual, so this problem is even more annoying with that.

The car was originally tuned by a shop with for a lot of bolt-ons. What...

Have you tried any of the other transforms? There is a fairly healthy list in the scanner. Brand doesn't matter all that much so long as the transform number is correct. If what the tuning school...

I've been doing a lot more research on this, as there is a correction you can make for IAT. Go to Engine>Airflow>General>Cylinder Charge Temperature. This table tells the PCM how much to bias ECT...

Glad you were able to resolve the problem. Can't say I'm a huge fan of wiring, but it's just one of those things that sometimes you have to roll up your sleeves and tackle. I did a PCM swap (98 to...

I have built and modified a few LS harnesses now chasing a similar problem, except mine ended up being a bad 'out of the box' crank sensor. I tore that whole car apart looking for that issue. The low...

I would do the same thing. Definitely sounds like an alternator issue. I would assume your injector PW would drop with lower voltage, hence the lean condition. Could be wrong though, but I'd start...

What voltage is dropping? Your O2 sensors or your battery gauge? Not sure what other mods you have either, or what tuning you have done. Maybe some more info would help here.

I'm sorry to hear that your issue is back. Maybe it heard you typing in a forum and decided to test your skills. Mine seems to do that to me, I swear. Every now and again it just does something...

Dynamic airflow is calculated from the VE table as you know, but "desired airflow" comes from your IAC vs effective area table. Therefore, when changes are made to the VE table, IAC effective steps...

You can tune with STFT's on with or without WB. I prefer the old school no trims at all, only WB approach. Always disable your LTFT's either in the tune, or with the scanner prior to logging. Make...

Personally, I leave the box unchecked and verify it has failed to SD with the scanner. That way if something else pops up while I'm driving around I'll know about it sooner than later.

Same here. I like to also see what my PCM is actually commanding too (via a simple AFR commanded histogram) so I can get as close to stoich in as many places as possible outside of PE, and to confirm...

And I have noticed on my car to keep an eye on IAT as well. Mine likes to get hot when sitting still idling. This plays with WB readings too, so for gen III's I have to say from experience that...

Does the WB peg out from time to time, one way or the other? It will really do this with rapid throttle changes. You could have a bad sensor. I've had this same issue before. Threw in a new sensor I...

Are you using a WB or are you relying on your O2 sensors?

And for tuning 4k and up make sure you have your PE table set accordingly, about 12.6 for an NA car, 11.5 or so for boost. This is...

I know you mention you have made a lot of timing changes. It appears from my first look at your tune you have nearly doubled the factory settings in the HO table in the problem areas 1200 to 2k. Not...

I forgot to add that you must be in Open Loop Speed Density to do the IAC tune procedure. Disable your MAF and tune your IAC in SD mode. Another technique is once you have your VE table correct (aka...

This is actually my first post on here, but I thought I would share some tips on tuning the GEN III dreaded 98 Camaro pcm. I have a 0411 in the mail as I type this, but this is relevant for any IAC...