Quote:
Originally Posted by Dieselchessy
That’s easy enough to test. Disconnect the booster vacuum line and plug it.
Then try the brakes again and see what happens.
Id expect a vacuum leak big enough to kill the engine to be whistling.
It seems the usual thing is to forget to connect the vacuum line to the IAC or worse yet swap it with a coolant line.
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Not always a whistle though. If its Super smooth idle, I wouldn't suspect a vaccuum leak. Mostly the idles a very rough when a vacuum leak are occurring. As any air entering the intake that's not measured causes issues.
I guess the brake booster could have failed and that sure would cause major vacuum leak but if this was the case. You should hear that leak.
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