boosted_d15b

guys i know u can help me plz , my buddy took my intake off and there is a sensor on it cause its a b16a2 usdm motor and cleaned the intake maninfold with some intake spay cleaner . when he put it back the motor started reving up and down and every since that it hasent been able to hold a steady idel.Its very anonying , can any1 tell me what the hell happen to my motor and why its doing this plzzz. thanxxx

kwikb16a2

MAP sensor

Chigga1

VACUUM LINE

behind the intake manifold is a little nozzle, check for a loose black line... if it is, you can hear it, its very faint sound, but you will hear the whistle...

i had this problem!
just revs up and down! up to 1500 - 2000RPM and back down to 1000Rpm

scott newman

vaccum leak for sure, could be a line, there is a small line coming off the charcol cannister that is easily forgotten or it could be a gasket,

imported_Cablerat

Since you say he took stuff off and then put it back, I would have to agree with the above. Most likely a vacuum line.

I had a similar problem when i first swapped in my motor. The BISS screw needed adjustment. It's the little screw on top of the throttle body.. Now, you're never really supposed to play with this screw, but in my situation that's what fixed the revving prob.

bbarbulo

iTrader: (2)

spray carb cleaner in the area, when the vacuum sucks the carb cleaner into the engine the revs will go up significantly.

4_door_teg

Like everyone else said, vacuum line. He may also have but them back on in the wrong place. try switching them

bbarbulo

iTrader: (2)

there you go steve... your post count is all fixed up now

bbarbulo

iTrader: (2)

it was fun while it lasted. Rick didn't see the humor in it

Gallagher

my car used to do that !