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  1. #1
    Saab Enthusiast
    Join Date
    13 Nov 2018
    2002 9-5 arc
    Thumbs Up:   2

    2002 saab 9-5 v6 rough idle when cold start

    My 02 9-5 has a rough idle when I start it, it all started when I noticed a whistling sound from what appears to be a leak in the brake booster vacuum hose but when I press on the break the car idles smooth like it suppose to and whistle stops but once brake is released high rough idle comes back with whistle..... helpppp

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  2. #2
    Saab Fan
    Join Date
    22 Jul 2018
    US PNW
    2001 9-5 5 door
    Thumbs Up:   5
    You answered your own question -- the problem is a vacuum leak. In the short term, try to find the hole in the booster line and wrap it with some electrical tape. Then order a new line and replace the failed one.

    To find the leak, get a spray can of brake cleaning solvent. Start the engine and spray the solvent along the suspect vacuum line. When you hear the idle increase, you've found the leak.

    More responsible people would say "have a fire extinguisher at hand." That's good advice, but I have a history of ignoring good advice, and the scars to prove it.

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