I have been having a problem with the truck in my signature. I have had two different cams in it and it has done it for both. Sitting at a stop light after about 30 seconds it will start running rough but not like it's losing a cylinder.
The thing a notice is my wideband starts to show lean up to 20 and then snaps right out of it and shows 12 after it is over. I don't know if this is a by product of what is happening. It will usual do this at least once in 10 mile city trip. It doesn't act like it is going to die but more like it has a huge cam in it and lopes like it. I can post my tune and a log of it if anyone thinks they can help.

 

Post a tune and log of this. I'll look at it.

 

Switch tuners.... Check out BlackBearPerformance.....

 

Thanks,
I will post it tonight, at work now.

 

I would like to stay with hp tuners since I've already have it. I think he uses efi live.

 

Wheatley uses HPtuners, give him a PM, i believe Nelson performance also uses HPtuners....

 

Ive tuned mine and have noticed the same thing, it will get progressively more lean until my wideband is maxed out over about 10 seconds then back to normal. Its only done it a couple times though.

 

I don't believe that they want to do any email tuning. My tuner sends me the tunes via email. He has done a good job but has had a hard time fixing the concern at idle. I'm sure it is hard to diagnosis something without being there to see it yourself. This way I can play with it and try and learn some of tuning for myself without having the tune locked.

 

I think the same thing mine does, it gets leaner and leaner until it's on 20 and then snaps right out of it and shows 12. Idles fine then for while and starts over.

 

Make it run open loop during idle. Depending on the overlap of the cam it is probably fresh air coming out of the exhaust valve hitting the o2's. Widebands aren't very accurate at idle conditions.