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    wont stay running at idle

    2 barrel 302 crown vic wont idle for more than 30 seconds, it will start running rough and then shuts off, if I hold the gas it will stay running. Fuel filter, plugs, wires, cap and rotor have been changed two months ago, prior to these events occuring, any help would be appreciated, thanks.

    #2
    When you’re holding down the gas, does it run smooth or does it seem broken up?


    My Cars:
    -1964 Comet 202 (116K Miles) - Long Term Project
    -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
    -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
    -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

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      #3
      when im holding the gas it does feel rough

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        #4
        What ignition system are you using with carburetor setup? Are you using the original TFI system, a Duraspark system, or something completely different?


        My Cars:
        -1964 Comet 202 (116K Miles) - Long Term Project
        -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
        -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
        -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

        Comment


          #5
          original setup

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            #6
            I might consider the pickup in the distributor to be getting flaky or the TFI module itself is shot. Some part stores will test the TFI. It may take a few tests to determine if it’s shot. I had similar symptoms when mine went out. Car ran, then ran crappy and wouldn’t go unless floored, and it ran poorly while doing so. If it cooled off some, it would crank up, but eventually failed to where it wouldn’t restart.

            I might check there first considering you’ve already done most of the other ignition stuff.


            My Cars:
            -1964 Comet 202 (116K Miles) - Long Term Project
            -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
            -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
            -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

            Comment


              #7
              I might consider buying a new distributor aswell, not really sure which one to get on rockauto, there are 5 different options and they say incorrect part# will cause damage. I also looked at my distributor and i dont see the mounted module, i only see the vacuum advance, i do however have the fender mounted module. I dont understand why the distributor is different.
              Last edited by 1985crownvicltd85; 01-13-2019, 10:39 PM.

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                #8
                So is your distributor:

                No.1


                No.2


                Considering your '85 has been carbureted, I would figure a lot of the electronics that drove the CFI system are missing.

                Since you mentioned you have a fender mounted module, I would be led to believe it looks like this?


                That's a Duraspark module. It also can fail out on you and cause running trouble.


                My Cars:
                -1964 Comet 202 (116K Miles) - Long Term Project
                -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
                -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
                -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

                Comment


                  #9
                  You sure that's a carburetor and not CFI? With the air cleaner in place the two systems look very similar. I had an '85 LTD CV, was CFI....
                  1985 LTD Crown Victoria - SOLD
                  1988 Town Car Signature - Current Party Barge

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                    #10
                    Originally posted by DerekTheGreat View Post
                    You sure that's a carburetor and not CFI? With the air cleaner in place the two systems look very similar. I had an '85 LTD CV, was CFI....
                    I though he said it was carb swapped in his other thread, but I may have misread that.


                    My Cars:
                    -1964 Comet 202 (116K Miles) - Long Term Project
                    -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
                    -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
                    -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

                    Comment


                      #11
                      i have the no1 distributor with the fender mounted module, im positive the carb has been swapped before, because im pretty sure its supposed to have the variable venturi

                      Comment


                        #12
                        Originally posted by 1985crownvicltd85 View Post
                        i have the no1 distributor with the fender mounted module, im positive the carb has been swapped before, because im pretty sure its supposed to have the variable venturi
                        Is your car a US or Canadian market car? Canadian cars kept the carburetor until SEFI was introduced. US market cars use CFI, which look like a carb but have two fuel injectors mounted inside.

                        Got any pictures?


                        My Cars:
                        -1964 Comet 202 (116K Miles) - Long Term Project
                        -1986 Dodge D-150 Royale SE (112K Miles) - Slowly Getting Put Back Together
                        -1987 Grand Marquis Colony Park LS (325K Miles) - April 2017 + September 2019 POTM Winner
                        -1997 Grand Marquis LS (240K Miles) - The Daily Workhorse & March 2015 + January 2019 POTM Winner

                        Comment


                          #13
                          Does it smoke black or grey when it starts to do this? Thats a sign of over-fueling. Could be stuck choke, improperly adjusted fuel mix, leaky needle seat, float level set wrong, or too much fuel pump pressure that is forcing the seat open.
                          86 Lincoln Town Car (Galactica).
                          5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley

                          91 Lincoln Mark VII LSC grandpa spec white and cranberry

                          1984 Lincoln Continental TurboDiesel - rolls coal

                          Originally posted by phayzer5
                          I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousers

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                            #14
                            the car is a canadian vehicle and it does have white/ grey smoke only when cold. once weather is warm I have no issues.

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                              #15
                              If it’s a cold issue only, verify the choke cap is getting 12v with the engine running. Verify the choke moves freely and can close and open.
                              With the engine cold and off, press the accelerator once and slowly release. Verify the choke is closed. Also it should catch a high idle step down below the choke. In theory the car should start. In reality, I usually have to give it a bit of gas pedal while cranking. Watch the choke, it should slowly open once the car starts. If it opens too fast, it’s adjustable on the choke cap by turning it. Can’t remember which way but they are usually marked.
                              1990 Country Squire - weekend cruiser, next project
                              1988 Crown Vic LTD Wagon - waiting in the wings

                              GMN Box Panther History
                              Box Panther Horsepower and Torque Ratings
                              Box Panther Production Numbers

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