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Thread: Engine Revs/Rpm Increase when Clutch Disengaged while driving

  1. 07-27-2017, 10:36 AM #1
    Jrex19
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    Engine Revs/Rpm Increase when Clutch Disengaged while driving

    Hi All
    Anyone had the lovely experience while driving where you disengage the clutch (press the clutch pedal) when shifting up/down and the rpms/revs on the engine increase? This only happens when driving the vehicle as if I depress the clutch when the car is stationary in idle, there is no rpm increase.
    I have already cleaned and examined the idle control valve. I have also checked the bowden tube on the clutch cable and it only slightly rubs the throttle linkage on the bellhousing. I dont think it is enough to create an issue.
    Could it be a vacuum leak?
    Faulty deceleration valve?
    Possibly the throttle and clutch cable are twisted in the tunnel?
    I am running a 993 Varioram with a 915 Euro transmission in a 1970 chassis. Lightened flywheel and clutch. Do you think I need to tune the ECU for this?
    Any thoughts, feed back, or advice would be greatly appreciated as I am stumped.
    Thanks
    Jason
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  2. 07-27-2017, 10:38 AM #2
    Vic Rola
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    Check the cables in the tunnel...clutch and throttle...they could be binding together at some point. Know from it happening to me.
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  3. 07-27-2017, 10:41 AM #3
    ejboyd5
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    Unsure as to what distributor may be involved; perhaps the advance weights are sticking if so equipped.
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  4. 07-29-2017, 09:04 AM #4
    Jrex19
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    Issue resolved. Cables rubbing at pedal box and Bowden tube resting on throttle linkage at the bell housing.
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  5. 07-29-2017, 02:55 PM #5
    michaelaiellosr
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    You might be interested in this thread

    http://www.early911sregistry.org/for...rottle+linkage
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