Ron_Stoppable

iTrader: (1)

Does anyone know what would cause this? I have ZERO exhaust leaks as I just assembled everything with fresh MLS gaskets and properly torqued everything. LTFTs stay very consistent on both banks. They stay at +25% kind of stumped. Idling and crusing my Aem wideband is pretty spot on @ 14.8:1 fuel pressure looks good and everything. O2s are brand new AC delcos. Once again Zero exhaust leaks. Think its just maybe tune related?

The Alchemist

iTrader: (19)

First off, is this a boosted car? Second, is the car modified where it would need a tune? Is the car tuned at all?

Ron_Stoppable

iTrader: (1)

Yes its a front mount S475. Truck has a base e85 tune on it.

The Alchemist

iTrader: (19)

Then the base tune is way off. I would not drive it like that. Get someone who knows what they are doing to look at it and correct the tune before you put more miles on it. +25 fuel trims is the max they will go, so it leaves no room for adjustment.

stevieturbo

If fuel trims are pegged like that, then as above, it probably just needs tuned correctly.

The Alchemist

iTrader: (19)

FYI, E85 requires a fair bit more fuel than e10 (normal gasoline), so it would makes sense that it is running with fuel trims that high. Did you tell your tuner that you planned to run e85?