i jus got done put'n a buddy's somewhat built y8 head on his d15 block. i got it to turn on but it jus acts like someone's pressing the gas and the idle's high...like 4 grand high. anyone kno what could be wrong? everythings connected like it should and im jus puzzled..

 

vacume leak could do it

 

this is a vaccum leak. where it is comming from who knows can't tell online, but i can tell you a few common places. the iacv(idle air control valve), but that is a motr loped idle, along with the fast idle valve under the throttle body. take the intake off a cover the tb and if it still revs 4k then you have a major leak.

 

yeah, i was bout to check the IAC valve. but the fast idle valve isnt it so ima take the IAC off and clean it up to see if that's it

what you mean?

 

take off the intake tube, start the car adn place your hand over the throttle body . if thier are no vaccum leaks it should stall. if it still revs to 4k with hand over tb then you knwo it's getting air from somewhere else. got it?

 

already did that no success.. ima jus clean out the iac valve and see what happends and jus double check all vac. lines and make sure none of em are crackd.. its the only thing i can think of

 

vacuum leak , throttle plate messed up , Throttle cable to tight.....check you main vac lines.

 

What I did to check for a vaccuum leak was sprayed intake/carb cleaner on my hoses and when the engine reved even higher i knew thats where my leak was

 

sounds like a plan, if all else fails, ima jus take the head off and put it right back on after i make sure everythings all gravy

 

Come pick me up, we can finally hang, and i'll check around and see what i can do