nickbrown68camaro

I swapped in a LQ9 with L92 heads/mild cam in my 68 Camaro. Slowly working out all the bugs, but now I'm stuck. The car starts, idles and runs great UNTIL it reaches operating temperature, 180 degrees and up it stutters, will barely idle, when you try to rev it up it backfire and has zero power and the car is undrivable. I've heard that the tune can cause this? I am running 34lb injectors (rated that at 43 PSI) and my tune was set up for 36lb injectors (since I'm running 50PSI) I have tried messing with the fuel rail pressure, no change in the how it runs. I'm at the point now where I'm looking to find a LS motor specialist near me and have them diagnose it so I can drive my car.

Any ideas on what to check or change? Thanks for your time!
-Nick

IllusionalTA

iTrader: (9)

Any ses codes? You have a scanner? Where are you located? Sounds like when car goes into closed loop it acts up to me..

Old Geezer

iTrader: (3)

Maybe try the tune/diagnostics forum???

nickbrown68camaro

No scanner, being this is my first LSX swap I see a scanner/tuner being a must have for my future. My ECM tuner (mail order) says it screams o2 sensor to him, they are both brand new but I have access to my buddies car for swapping sensors/etc. I'm located in Lexington Park, MD 20653, not many guys around here have LSX experience thats the bad part!

Appreciate the assistance fellas!
-Nick

nickbrown68camaro

Thanks Chuck,

After only a few responses I figure I'd try that today as well!
-Nick

IllusionalTA

iTrader: (9)

Unplug the o2's it's my thoughts as well..