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Issue has been greatly reduced. Tables for the o2 heaters were adjusted to add more heat to them for a longer period of time. Car still goes super rich but only for like 10-15 seconds and I'm ready to roll! Only one more kink to work out in this tune.

I'll try to get it logged and I can upload a file for you!

Starts up, idles around stoich, 20 seconds later goes super rich to the 10s, then goes back to normal and it stays normal until next startup.

Car is tuned using HPTuners and is a custom tune tweaked per the cars mods from the stock tune file. Issue at the moment is the car randomly (but usually) whether hot or cold, or whatever, gets super rich at start up. For about 20 seconds it idles normally, then gets down to the 10s for AFRs...

No clue what it is but my car is nearly the same way!

I doubt the oil pressure has anything to do with it, as the car ran fine with no rev hangs on the tune I bought with it, in terms of revs at least. Problem with that tune was terrible running when cold and poor poor mpgs.

No clue, car is a manual though. I can try an get a reading when I'm back at school, which is where the car is.

Dyno tuning always win. Street tuning takes far longer, and load dynos are controlled environments. If a car acts up in a scenario, it's easy to replicate with the dyno to see the issue. I just don't have cash loads to throw at dyno tuning. So I'm spending a couple hundred bucks and spending...

Those following the rev hang post of mine, HUGE thanks to all your replies! Tune other than that issue is running quite good on the car. Only thing we cannot figure out is quite strange. Upon start-up, car cycles afr's right around 14.7 as you'd expect. Wait 30 seconds, and that number goes way...

Car's original tune I bought it with had no issues in rev hang or any throttle response issues at all. Car is currently being retuned from scratch from a stock tune. So far have adjusted for maf size & cmcv deletes. Car running quite well other than hangs. Next tune to further tweak maf size and...

Wow, did not think I'd get this many replies. Appreciate all the knowledge and info you guys, very helpful! I don't plan on touching that screw either! Though I have a BBK twin 62, I'll just be taking it off and cleaning it. Dashpot settings WILL be played with next tune! Also does anyone know...

Thanks for the info, going to research the dashpot settings!

Ok I was not sure if the cams would have any markings on them or not. Will definitely try this. My friend who's tuning it did powertrain diagnostics for ford and John Deere, and currently has tuned his 2011 v6. He tuned it NA and now it's procharged and he's tuned it as well. The car is an animal.

Long story short >had a tune on the car when I bought it >Car ran badly at cold start, and ran great when warm >Car got like 5-10mpgs >Had ford dealer remove tune from car, after buying SCT X4 >SCTX4 preloaded tunes ran awful on the car Have been tuning the car with a buddy who uses HP...

Thanks for the info Gabe! Much appreciated. My rear sway bar is already out, so for now I'll be hunting around for a removal tutorial or at least some information on it. Thanks again!

Good to know! Are there any tutorials you could point me towards? Didn't see much on youtube. Also about how heavy is it? Could I transport one in my mustang or a large sedan? Going to have to give this a shot during my thanksgiving break!

Hey guys, I was dumb and bought a pretty beat mustang from some guy who really neglected this thing. My rear diff and ring/pinion are basically destroyed. My right rear wheel bearing is also shot currently. I was quoted 2k by a few mechanics to put in a stock ford 3.55 that was refurbished. I'd...