RPM surge between shifts anyone know why?
02-02-2010, 11:14 AM
#1
Thread Starter
Join Date: Jan 2010
Location: tennessee
Posts: 2
RPM surge between shifts anyone know why?
hey guys wat up i have a 94 mustang gt and recently just installed a new idle air control sensor since i installed this there is a strange hissing noise on the passenger side and my RPMs surge about 500 when i press the clutch any idea what could cause this I HAVE NO IDEA, IT DRIVING ME INSANE
02-02-2010, 01:40 PM
#2
5th Gear Member
Join Date: Sep 2009
Location: KY, was MA
Posts: 2,797
it surges up an additional 500 rpm?
my guess would be since the engine is no longer connected to the tranny when the clutch is pressed, it is easier to idle and will jump up a tad?
is everything connected? i think the last time i did this, i had to calibrate the IAC valve. this was on a 3.8L '93 thunderbird though.
my guess would be since the engine is no longer connected to the tranny when the clutch is pressed, it is easier to idle and will jump up a tad?
is everything connected? i think the last time i did this, i had to calibrate the IAC valve. this was on a 3.8L '93 thunderbird though.
02-02-2010, 03:32 PM
#3
3rd Gear Member
Join Date: Dec 2009
Location: Acworth,Ga.
Posts: 812
The hissing noise could be a vacuum leak. It could make it rev higher in between shifts to make up for the leak. Check all the HOSES for a disconnected one, even on the Driver side for air hissing under the hood.
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