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Thread: Intermittent surging/pulsing at idle

  1. #1
    Senior Member 500ebeebe's Avatar
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    Intermittent surging/pulsing at idle

    having a surging issue at idle where the revs bounce between roughly 400rpm and 700rpm in a 2-3 second interval. i'm thinking possibly an old vacuum line somewhere, but is this an issue that others have seen in the past and know about? i'm somewhat new to 500s, but not german cars in general. i took a video with my phone, but it's too big to upload. i'll have to work on downsampling that vid and posting it. any thoughts would be greatly appreciated. thanks!
    '92 500E - 199/blk, '97 C4S - blk/blk
    '87 911 - blk/tan, '86 951 - blk/blk
    '05 V70R - blk/tan

    past: '05 C2S, '93 RSA, '78 euro 928, '67 911, '70 914, '88 M3, '88 M5, '95 M3, '95 LTW, '74 02, '76 02, '95.5 S6, '04 S4 avant...

  2. #2
    .036 Hoonigan™
    E500E Boffin
    gsxr's Avatar
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    Re: Intermittent surging/pulsing at idle

    VERY likely to be a vacuum leak... and could be a nuisance to track down. Wouldn't hurt to check/clear codes for grins.

    Dave M.
    1997 E420 (Bugeyes)
    1994 E420 (Blondie)
    1994 E500 (Q-ship)
    1992 500E (Mach 5)
    1987 300D (Sportline Stage 2)
    Click here for my website
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  3. #3
    Senior Member 500ebeebe's Avatar
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    Mar 2012
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    Re: Intermittent surging/pulsing at idle

    thanks gsxr! i own a 944 Turbo, so i'm very aware of how annoying tracking down vacuum leaks can be.
    when i have some time, i'll check the various lines and see what i come up with.
    '92 500E - 199/blk, '97 C4S - blk/blk
    '87 911 - blk/tan, '86 951 - blk/blk
    '05 V70R - blk/tan

    past: '05 C2S, '93 RSA, '78 euro 928, '67 911, '70 914, '88 M3, '88 M5, '95 M3, '95 LTW, '74 02, '76 02, '95.5 S6, '04 S4 avant...

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