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Thread: Engine revs rising and falling

  1. 04-20-2025, 09:58 AM #1
    Veronica87911
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    Question Engine revs rising and falling

    I’ve notice recently that after longish drives, when going back to my garage, the engine revs start rising and falling fairly quickly. After a couple of minutes, it steadies itself but then idles at around 1300-1400 rpm’s.
    Any ideas or thoughts what might be causing this issue? Any help is much appreciated.
    Serge

    City of Ben Franklin and Cheesesteaks
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  2. 04-20-2025, 05:33 PM #2
    Richy
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    It would certainly help if we knew what you were driving .
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  3. 04-21-2025, 08:55 AM #3
    Veronica87911
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    72 911 with 77 2.7 S engine (see the avatar and signature)
    Serge

    City of Ben Franklin and Cheesesteaks
    Instagram: Truevisionmediaworks

    Early S Registry #2457
    Daisy: 1972 T with 2.7 engine and Webers
    LOOKING FOR 911 Engine # 6123044

    Rowlf: 2017 Volvo S60 with Polestar Optimization


    Mostro di Biscotti: 1975 Lancia Fulvia 1.3S Series 2 SOLD

    Veronica: 1987 Carrera coupe - curves in all the right places...SOLD
    Lil' Blue: 2002 Subaru WRX Wagon SOLD
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  4. 04-21-2025, 12:04 PM #4
    1QuickS
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    Possibly advance on distributor is being activated. If distributor has vacuum hose then perhaps there is a vacuum leak that is affected by heat.
    Last edited by 1QuickS; 04-21-2025 at 12:49 PM.
    Paul Abbott
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