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Thread: Help needed diagnosing Weber 40 IDA 3C problem

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  1. 08-16-2022, 10:44 AM #1
    Bob Schaefer
    Bob Schaefer is offline
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    Jan 2003
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    Help needed diagnosing Weber 40 IDA 3C problem

    Hi Folks -

    FWIW, except for Weber carbs, ported heads and cams with more aggressive acceleration ramps, the engine in my 914/6 is essentially built to ‘73 Carerra RS specs.

    The engine ran fine, but suddenly began missing under operating conditions less than approximately 75% throttle. However it still pulls smoothly and strongly at WOT to redline.

    Checked the idle jets. All are clear.

    Driven only 369 miles since PPI and extensive servicing, including carb sync and idle & mixture adjustment by preeminent Porsche shop.

    What should I check next? (Beside checking and possibly upgrading fuel & air filtration already on my radar)

    Any help greatly appreciated.
    Last edited by Bob Schaefer; 08-16-2022 at 11:17 AM.
    Bob Schaefer

    ‘67 911S Canary/Lemon yellow, sunroof coupe produced w/100L tank. Until determined otherwise, 306943S appears to be 1 of 1, and among the earliest 911’s with a 100L tank. The 911’s initial participation in a competitive event, the 1965 Monte Carlo Rally, was fitted with a 100L tank (#300055). Seeking additional info on earliest 100L tank fitments to 911’s.



    ‘70 914/6 (2.7l RS spec engine, but searching for 6404915 original)
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