68 427 435 hp tri power idle issues - NCRS Discussion Boards

68 427 435 hp tri power idle issues

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  • Ed P.
    Very Frequent User
    • July 31, 2002
    • 270
    #16
    Re: 68 427 435 hp tri power idle issues

    New carbs. Checked intake with propane torch and also a smoke machine.
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      • Danny P.
        Very Frequent User
        • June 30, 2002
        • 341
        #17
        Re: 68 427 435 hp tri power idle issues

        Originally posted by Ed Pearce (38494)
        New carbs. Checked intake with propane torch and also a smoke machine.

        Ed, where are the old carbs. what was wrong with them, if you still have the old center carb. try it and see what happens , does your car have power brake system and you said you isolated the engine vacuum from everywhere,
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          • Ed P.
            Very Frequent User
            • July 31, 2002
            • 270
            #18
            Re: 68 427 435 hp tri power idle issues

            ok update I acquired a known good center carb and idle is perfect was able to adjust idle down to 600 rpm. Idle air bleeds measured .077 on both carbs. Carbs were NOS Holley from the circa 1990's with new gaskets.
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              • Danny P.
                Very Frequent User
                • June 30, 2002
                • 341
                #19
                Re: 68 427 435 hp tri power idle issues

                Originally posted by Ed Pearce (38494)
                ok update I acquired a known good center carb and idle is perfect was able to adjust idle down to 600 rpm. Idle air bleeds measured .077 on both carbs. Carbs were NOS Holley from the circa 1990's with new gaskets.
                Glad it all work out for you Ed , now you can put everything back together and enjoy the car 👍
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                  • Ed P.
                    Very Frequent User
                    • July 31, 2002
                    • 270
                    #20
                    Re: 68 427 435 hp tri power idle issues

                    Well not yet the carb that works is borrowed. I now have to figure out whats wrong with my carb.
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                      • Rich G.
                        Extremely Frequent Poster
                        • August 31, 2002
                        • 1397
                        #21
                        Re: 68 427 435 hp tri power idle issues

                        I had issues off and on for 18 years with a 68 L71. Got maybe two good full seasons out of it along with back trouble and scrapped knuckles from removing and replacing carbs after rebuild. And finally solved the problem. I sold it. 😀

                        Glad you are zeroing in on your problem.

                        Rich
                        1966 L79 Convertible. Milano Maroon
                        1968 L71 Coupe. Rally Red (Sold 6/21)
                        1963 Corvair Monza Convertible
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                          • Ed P.
                            Very Frequent User
                            • July 31, 2002
                            • 270
                            #22
                            Re: 68 427 435 hp tri power idle issues

                            OK issue solved, gasket wrong between base plate and body blocking idle fuel passages. Thanks for all the help. Ed
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                              • Danny P.
                                Very Frequent User
                                • June 30, 2002
                                • 341
                                #23
                                Re: 68 427 435 hp tri power idle issues

                                Originally posted by Ed Pearce (38494)
                                New carbs. Checked intake with propane torch and also a smoke machine.
                                Thought you said they were new Carbs. you install, I guess they were rebuild by someone at one point glad you found the problem with the wrong gasket.
                                Last edited by Danny P.; August 29, 2021, 11:26 AM.
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