I found a vacuum leak on my 96 jetta. I sealed the leak and now the car wont idle at all. Immediately stalls as soon as i let off of the accelerator. Any ideas?

Asked by Jul 30, 2015 at 08:43 PM about the 1996 Volkswagen Jetta 4 Dr Trek Limited Edition Sedan

Question type: Maintenance & Repair

If i allow the vacuum line to leak a
little, the car will run. But its the line
that leads to my brake booster, so if
it breaks completely....

2 Answers


Sounds like a bad IAC (Idle Air Control) valve. At idle the computer opens up the IAC just a little bit to direct a small amount of air past the closed throttle plate. Air, obviously, is one of the things you need for the engine to run. If the IAC is stuck shut the engine will stall when the throttle plate is closed. The throttle plate is closed when your foot is off the accelerator pedal. The vacuum leak is actually letting the engine pull air into the intake manifold through another location (the vacuum booster hose for the power brakes). So the engine continues to run. When you seal off the leak air can't in through the "back door", so to speak and the engine stalls. HTH. -Jim


Hi nice to meet you. This vaccum line have a T form unit. This vaccum line is the same for jetta, golf and sometimes is the same in the new beetle. That vaccum line affects the operation of the idle of the engine because connects directly with the intake multiport. If the line is broken don't waste more time and replace the line I guarantee you will solve your idle problem .

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