Vacuum leak makes it run better?
#1
Vacuum leak makes it run better?
I have a 91 corvette with the L-98 tpi engine. I recently changed my power brake booster because my pedal turned rock hard. When I was finished replacing it I started the car and it stalled almost instantly. I took the vacuum line off the booster and it runs just like normal. I plugged the line as the dealer suggested to test it out and it stalls instantly. Im told this is completely backwards than it should be. Any ideas on what to do or check next? Any help would be appreciated.
#3
it will run if I connect it to the booster as long as I keep it at half throttle or so. The weird thing is that it ran fine before I started this project I just didnt have power brakes.
#4
The IAC is essentially a vacuum leak itself. I'm guessing what happened is that the IAC had closed completely attempting to compensate for the booster leak and is now stuck shut, as 94z07fx3 suggests.
Last edited by toptechx6; 06-11-2010 at 04:30 AM.
#5
But the part that I don't understand is that it ran perfect before I pulled the vacuum booster, but as soon as it was all together it would not run. Which confused me and made me think I either messed something up or did something wrong. But I didn't change or take anything off other than that one vacuum line. Maybe just a fluke that it happened at the same time?
#6
But the part that I don't understand is that it ran perfect before I pulled the vacuum booster, but as soon as it was all together it would not run. Which confused me and made me think I either messed something up or did something wrong. But I didn't change or take anything off other than that one vacuum line. Maybe just a fluke that it happened at the same time?
#9
Drifting
Not really, the IAC works on a motor solenoid. You have to spin the armature of the motor to get the plunger to go in. Try this, pull it out (IAC) and start the car. Hold your thumb over the hole and watch the plunger. Experiment by letting more or less air into the engine. Does the IAC move? If no, it's bad.