Hey everyone. I have a 94 Firebird Formula with a 355, lt4 hotcam, 55# injectors on turbo. Was working great until about 2 weeks ago. Bank 2 started running lean, and cant figure it out. I have changed the MAF sensor 3x, both O2's twice, checked for vacuum leaks like every day from the wastegate to turbo to chargepipe to intake manifold and all vacuum hoses in between. Checked for exhaust leaks, have none. Checked for irratic or lazy injector(s)...nothing there either. Help please!

 

How bout checking your fuel pressure? If you can't find a vacuum or exhaust leak, then possibly the fuel pump can't keep up with those 55lb injectors? Bank 2 is the passenger side, so could make sense. Other than that try data logging it to see if you can find anything that way.

hth

andy schuck

 

I hope you've figured it out now, but if not, I would run some injector cleaner through it. Supposedly the cleaner eats something (injectors or lines or something), so you don't want to run it for no reason, but you definitely have a reason.