69 L71 just dies after a warm idle - NCRS Discussion Boards

69 L71 just dies after a warm idle

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • Chris H.
    Very Frequent User
    • April 1, 2000
    • 837

    #46
    Re: 69 L71 just dies after a warm idle

    Lawrence, progress! That linkage is only to close the secondaries. Not open them. They are opened using the vacuum secondaries on the other side of the carbs. Any chance you could post a photo of the close linkage?
    1969 Riverside Gold Coupe, L71, 14,000 miles. Top Flight, 2 Star Bowtie.

    Comment

    • Duke W.
      Beyond Control Poster
      • January 1, 1993
      • 15672

      #47
      Re: 69 L71 just dies after a warm idle

      As stated the front/rear carbs are opened by venturi vacuum applied to the big vacuum pots, and the mechanical linkage is there to close them positively when you lift off the throttle. If you blip the throttle real hard from idle you should be able to see them begin to open.

      Found a problem when practicing a PV for a local chapter member. WOT acceleration and induction noise was not up to par. Diagnosis revealed that the front/rear carbs would not open. Turned out the front throttle blades were jammed in the bore, and I finally applied enough force on the closing linkage to open them. Then it accelerated like a L-71 should.

      Duke

      Comment

      • Chris H.
        Very Frequent User
        • April 1, 2000
        • 837

        #48
        Re: 69 L71 just dies after a warm idle

        Lawrence, for reference here are some photos. Chris



        Attached Files
        1969 Riverside Gold Coupe, L71, 14,000 miles. Top Flight, 2 Star Bowtie.

        Comment

        • Danny P.
          • Today

          #49
          Re: 69 L71 just dies after a warm idle

          First you have the wrong front fuel Bowl, side plug is the same height as the center Carburetor, front and rear Carburetor bowl are lower then the Center Bowl Carburetor, i would remove the secondary linkage and plug up vacuum port set up your center Carburetor and go for a 10 mile road test and see what happen if it still stall or won,t start you may have a floating problem ,check your float levels and also pull out the needle and seat check for any dirt

          Comment

          • Chris H.
            Very Frequent User
            • April 1, 2000
            • 837

            #50
            Re: 69 L71 just dies after a warm idle

            Lawrence, this thread has grown multiple branches. Make sure you see the most recent responses.
            1969 Riverside Gold Coupe, L71, 14,000 miles. Top Flight, 2 Star Bowtie.

            Comment

            • Lawrence S.
              Very Frequent User
              • April 1, 1993
              • 801

              #51
              Re: 69 L71 just dies after a warm idle

              Originally posted by Danny Pantuso (63794)
              First you have the wrong front fuel Bowl, side plug is the same height as the center Carburetor, front and rear Carburetor bowl are lower then the Center Bowl Carburetor, i would remove the secondary linkage and plug up vacuum port set up your center Carburetor and go for a 10 mile road test and see what happen if it still stall or won,t start you may have a floating problem ,check your float levels and also pull out the needle and seat check for any dirt
              I have not posted any photos of my carbs

              Comment

              • Lawrence S.
                Very Frequent User
                • April 1, 1993
                • 801

                #52
                Re: 69 L71 just dies after a warm idle

                I noticed detonation on last drive. I checked the initial timing it is now 12.5*. I thought that was weird since last time I checked it was 10.3*. But the 10.3* was with the carb linkage not hooked up correctly. I could not get the car to idle down to 750 or 800 RPM's because the linkage was cracking open the secondaries. I am going to reset to 10* and recheck everything. Probably will put in weaker springs to get the curve correct.

                Comment

                • Terry M.
                  Beyond Control Poster
                  • September 30, 1980
                  • 15601

                  #53
                  Re: 69 L71 just dies after a warm idle

                  Lawrence
                  The idle and timing settings have to be done with the secondary carburetor linkage in the correct position. You MUST do these adjustments per the Factory Service Manual (FSM). To do otherwise will leave you chasing your tail -- which is sounds like you are close to. Please follow the FSM for success. If you don't have a 1969 FSM invest in one from the NCRS store. You will find that in the long run it is a cheap investment.
                  Terry

                  Comment

                  • Danny P.
                    • Today

                    #54
                    Re: 69 L71 just dies after a warm idle

                    Well i guess Chris Hewitt posted photos of his Tri power Carburetors that i see, thought they were yours Sorry

                    Comment

                    • Lawrence S.
                      Very Frequent User
                      • April 1, 1993
                      • 801

                      #55
                      Re: 69 L71 just dies after a warm idle

                      Originally posted by Terry McManmon (3966)
                      Lawrence
                      The idle and timing settings have to be done with the secondary carburetor linkage in the correct position. You MUST do these adjustments per the Factory Service Manual (FSM). To do otherwise will leave you chasing your tail -- which is sounds like you are close to. Please follow the FSM for success. If you don't have a 1969 FSM invest in one from the NCRS store. You will find that in the long run it is a cheap investment.
                      I have one and set the carbs per the manual...as close as possible

                      Comment

                      • Lawrence S.
                        Very Frequent User
                        • April 1, 1993
                        • 801

                        #56
                        Re: 69 L71 just dies after a warm idle

                        Originally posted by Danny Pantuso (63794)
                        Well i guess Chris Hewitt posted photos of his Tri power Carburetors that i see, thought they were yours Sorry
                        No problem

                        Comment

                        • Lawrence S.
                          Very Frequent User
                          • April 1, 1993
                          • 801

                          #57
                          Re: 69 L71 just dies after a warm idle

                          Today, I tried several sets of springs of which a few sets physically looked different but the spring tension for a few sets were basically the same. I had the centrifugal coming in very early and had to set the curb idle around 650 rpm so the centrifugal advance would not effect the timing. I did not like that .I wanted the centrifugal stay at 0* at 900 rpm. I put a little stiffer spring in and I basically got the timing set so 36* comes in at 2800 rpm. With a blip of the throttle I can get the timing up to 39*. My initial timing is 10*. Car runs great and thanks for all the help.

                          Comment

                          • Terry M.
                            Beyond Control Poster
                            • September 30, 1980
                            • 15601

                            #58
                            Re: 69 L71 just dies after a warm idle

                            Originally posted by Lawrence Shaw (22476)
                            I have one and set the carbs per the manual...as close as possible
                            OK That's the ticket.
                            Terry

                            Comment

                            Working...
                            Searching...Please wait.
                            An unexpected error was returned: 'Your submission could not be processed because you have logged in since the previous page was loaded.

                            Please push the back button and reload the previous window.'
                            An unexpected error was returned: 'Your submission could not be processed because the token has expired.

                            Please push the back button and reload the previous window.'
                            An internal error has occurred and the module cannot be displayed.
                            There are no results that meet this criteria.
                            Search Result for "|||"