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Why Does My 258 - I6 Idle better w/ Spark Advance Vacuum Disonnected? Page Title Module
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  • Why Does My 258 - I6 Idle better w/ Spark Advance Vacuum Disonnected?

    My 1985 CJ7 258 - I6 w/ Carter BBD was idling very erradically and rough until I disonnected the vacuum hose and just let it lay. I didn't plug the hose nor the spark advance. It is still sitting there sucking vacuum diconnected but the engine is smooth now. I drove it about 10 miles and it ran fine on the road and still idles smooth.

    Will it hurt anything to leave it disconnected and unplugged?

    Thanks
    Swampdawg

  • #2
    Had same problem on my 86. The vac. source for mine as I recall, came off the intake manifold. This is way too much vac. at an idle and advances the timimg way to far when hooked up. Just pull it and PLUG the hose like many of us did.

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    • #3
      have you done the nutter bypass and removed computer contolled vacuum systems?...is your vacuum advance plugged straight in to the carb, under the choke?...heres a diagram John Strenk posted for me when i was having vacuum issues:


      http://i33.photobucket.com/albums/d5...vacuumdiag.jpg

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      • #4
        I would not leave this disconnected. Your engine will run like crap. Use the diagram, you will like the way it performs much better.

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        • #5
          Mine comes from the bottom of the carb to the spark advance. It idles really good without it. I do notice a little loss of power on a hill without it hooked up. I don't have the By Pass.
          Thanks.

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          • #6
            Do you have to have all your emmission stuff on where you are?
            If you do I have the vacuum diag out of an 83 that might be of use.
            Last edited by Penguin; 03-13-2007, 10:44 AM.

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            • #7
              Hi Penguin and Thanks,
              My county does not have the Emissions inspections yet but I hear they may be coming one day. Our neighboring counties around Atlanta are now doing the emmissions testing.
              I will print our your diagram and take a look. It says V - 6. Do you think that is the same a the I 6? I have the 258 I6.

              Thanks,
              Swamdawg

              Comment


              • #8
                Originally posted by Penguin
                Do you have to have all your emmission stuff on where you are?
                If you do I have the vacuum diag out of an 83 that might be of use.
                Get rid of your carter bbd and install a gm tbi http://www.bustedjeep.com . I had a Howell TBI installed on my '83 cj8 got power,18mpg and a better running jeep that smogged really easy and got to dump all of the furd crap and lots of the excess tubes and hoses.

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                • #9
                  Originally posted by swampdawg
                  Hi Penguin and Thanks,
                  My county does not have the Emissions inspections yet but I hear they may be coming one day. Our neighboring counties around Atlanta are now doing the emmissions testing.
                  I will print our your diagram and take a look. It says V - 6. Do you think that is the same a the I 6? I have the 258 I6.

                  Thanks,
                  Swamdawg
                  You might want to look at that again.
                  It says at the top of the page V-6.
                  As in V for vacuum
                  and page 6

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                  • #10
                    Hi SCR83jp,
                    That GM TBI carb. looks pretty good. Now if I could find a good mechanic to do all those steps. mmmmm. Let me smoke that one over.

                    Thanks,
                    Swampdawg

                    Comment


                    • #11
                      Thanks Penquin,

                      I see what you mean about the V- 6.. Much Obliged!

                      Swampdawg

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                      • #12
                        Originally posted by swampdawg
                        Hi SCR83jp,
                        That GM TBI carb. looks pretty good. Now if I could find a good mechanic to do all those steps. mmmmm. Let me smoke that one over.

                        Thanks,
                        Swampdawg
                        It wakes up your I6 258 the busted jeep directions are pretty straight forward .I'm in CA so bought a Howell TBI from Turbo City & they sort of installed it,the disy was worn & needed a rebuild but they neglected to do it so I had many problems,I fixed my problem by getting my disy rebuilt & installed.busted jeep has the info on the disy mods to use a gm ignition module.Follow Busted Jeep directions and save big bucks.
                        Last edited by scr83jp; 03-17-2007, 02:12 PM.

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