Any ideas on this one??

[tunedin302]

Have mods listed in my signature. Car runs great but when I take my foot off the gas I get a "check engine" light. If the light is on and I hit the gas again the light will go off. It will always do it if I am in 5th gear on the highway and coming to a stop/exit. My car has even stalled because of this. Any ideas? I was thinking it maybe the IAC. It never did this before I put the blower on it about a year ago. Have only driven the car about 300 miles since. Thanks.

 

[tunedin302]

No one??

 

[HISSIN50]

what code are you getting? That is the first place to start.

 

[Paul Perreca]

do you have heads on that thing, or is that a basically stock motor w/ a super charger? i dunno if anderson is heads or not
Paul Perreca

 

[1991GreeNLX]

check your throttle body make sure it doesnt stick try cleaning it out if not make sure your gas pedal dont get stuck check fuses then try codes

 

[TheUser]

Definately pull codes. If you don't know how, search for the user name "Jrichker" and he has the info. on how to do it w/ a paperclip in many posts.

It kinda does sound like it could be something to do w/ the IAC.

First though, how many pounds of boost are you running? Do you have a bypass valve? Did you re-route the hose from the oil filler tube to throttle body? With a supercharger that hose should go from the oil filler tube nipple to the airbox INSTEAD of to the throttle body as it is stock; the reason is you don't want to put boost into your crankcase.

Without a bypass valve, you could be pushing too much air at the closed throttle body, which isn't good and I believe it could potentially be causing the problems you describe. Generally though, bypass valves are only necessary for over 6psi or so, I think.

I definately pull codes first thing though.