Thread: Mystery problem with S/C

I was with W-Body guy today to get my LIM gasket taken care of. Good news it that the gasket have been already replaced. The oil is clean and there was not a vacuum leak found. The Supercharger is still "twittering" though. Performance is awful when boost is used. We tried everything we could think of

Fuel line pressure (50 psi+)
Remove tuned pcm and installed stock
plugged BBV valve
Check wires/hoses (the coolant overflow hose does need to be replaced)
Checked MAF

After some scanning the car is running lean. Birkboy would be able to explain this better but for the most part the car is not getting enough fuel.

The problem is getting worse though. It used to hang a few seconds when using boost but now it just twitters and barely moved.

Im taking it to a local shop the the fam has been going to for a while tomorrow and let them look at it.

We are thinking that the car needs tuning to cure, but the fact that we put in the stock pcm with no improvement leaves us confused.

Any suggestions?

Sticking fuel injector?

!

Seafoam it?

Well I forgot to add this important detail. The car rides fine (little rough pulse idle at times) without using boost

Some seafoam in the tank would help a sticking injector, if that's the case. No idea for sure.

Are you getting any misfire codes? Almost seems like an ignition issue.

Scanned. No misfire

I have gotten the fuel injectors clean about a year ago. Possible but I do not think it is.

It's not going to hurt to run some Sea Foam or Lucas Fuel Injector Cleaner through your system. Run it to a half tank instead of a full tank so it will be a bit more concentrated.

Im going to replace the fuel filter tmw.

It also could be the NB 02 sensor