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HighER idle and engine "coughing"

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    #1

    HighER idle and engine "coughing"

    I had a chance to clean the intake and TB with the AMSOIL powerfoam. Took it out, got the smoke out. After all that, after poking my head by the exhaust, I notice I don't here the coughing from the exhaust pipes (awesome). It even seems to run peppier.

    Now I notice when engine is cold, idle is all right, but after driving to warm temp, I notice the idle is higher. I also noticed that when the car goes into OD, and I tromp the gas (under load) btw 40-55 the engine would cough (feels like a miss). Any idea if this has anything to do with cleaning the intake? Did I push the carbon and crap further down the line?
    "To Find yourself, you must first lose yourself"

    -1973 Volkswagen Bus Westy
    -1986 Honda Magna 700cc
    -1989 Lincoln Town car Signature Series
    -2011 Subaru Outback
    Tags: None
    #2
    trying to fix the lopo miss maybe?

    1986 lincoln towncar signature series. 5.0 HO with thumper performance ported e7 heads, 1.7 roller rockers, warm air intake, 65mm throttle body, 1/2" intake spacer, ported intakes, 3.73 rear with trac lock, 98-02 front brake conversion, 92-97 rear disc conversion, 1" rear swaybar, 1 3/16" front swaybar, 16" wheels and tires, loud ass stereo system, badass cb, best time to date 15.94 at 87 mph. lots of mods in the works 221.8 rwhp 278 rwt
    2006 Lincoln Town Car Signature. Stock for now
    1989 Ford F-250 4x4 much much more to come, sefi converted so far.
    1986 Toyota pickup with LSC wheels and 225/60/16 tires.
    2008 Hyundai Elantra future Revcon toad
    1987 TriBurner and 1986 Alaska stokers keeping me warm. (and some pesky oil heat)

    please be patient, rebuilding an empire!

    Comment

      #3
      Scott,

      That is the thing, it never did it before. Or if it did, it was incredibly rare. It seems to duplicate very intermittently, weird...

      I was think of looking at the plugs to see.

      Also, I might use my scanner to see if there are any error codes
      "To Find yourself, you must first lose yourself"

      -1973 Volkswagen Bus Westy
      -1986 Honda Magna 700cc
      -1989 Lincoln Town car Signature Series
      -2011 Subaru Outback

      Comment

        #4
        wonder if you fouled the plugs.
        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

        Comment

          #5
          That's what I am thinking, I will pull them, verify the .052 gap put before I do that, probably run one more shot of the powerfoam stuff through the intake just to chase the leftover crap out to the exhaust.
          "To Find yourself, you must first lose yourself"

          -1973 Volkswagen Bus Westy
          -1986 Honda Magna 700cc
          -1989 Lincoln Town car Signature Series
          -2011 Subaru Outback

          Comment

            #6
            the rear plugs in a 302 are prone to fouling anyway, so its possible the magic juice broke something loose and sludged them. The intake runners on those back cylinders are always more crapped up than the other 6.
            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

            Comment

              #7
              I had new plugs and wires put in the car a couple of years ago, so I guess that must be it.

              Any reason why my idle gets higher as the car gets warmer?
              "To Find yourself, you must first lose yourself"

              -1973 Volkswagen Bus Westy
              -1986 Honda Magna 700cc
              -1989 Lincoln Town car Signature Series
              -2011 Subaru Outback

              Comment

                #8
                Any trouble codes?

                '78 LTD | '87 Grand Marquis | '89 Crown Vic (RIP) | '91 Grand Marquis (RIP) | '94 Town Car (RIP) | '97 Town Car (RIP)

                Comment

                  #9
                  IAC might be sticky and not returning fully to the shut position. Or maybe someone jacked with the "idle screw" and it can't control the idle down to where it belongs. Unplug the IAC and see if the idle drops. If it doesn't, thats why.
                  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

                  Comment

                    #10
                    Magic potions make strange things afoot at the circle k... IAC is probably loaded with crud I bet. Clean that like I did with the Merc. Don't let the engine stall though...

                    Comment

                      #11
                      Originally posted by 86VickyLX View Post
                      Magic potions make strange things afoot at the circle k... IAC is probably loaded with crud I bet. Clean that like I did with the Merc. Don't let the engine stall though...
                      John,

                      So run throttle body cleaner in the hole on the side of the throttle body where the IAC goes into it?
                      "To Find yourself, you must first lose yourself"

                      -1973 Volkswagen Bus Westy
                      -1986 Honda Magna 700cc
                      -1989 Lincoln Town car Signature Series
                      -2011 Subaru Outback

                      Comment

                        #12
                        Yeah, that should clean the IAC if it's sludged up.

                        Comment

                          #13
                          Ok, I wasn't sure if spraying in that hold in the throttle body going into the IAC would do harm. I thought it would
                          "To Find yourself, you must first lose yourself"

                          -1973 Volkswagen Bus Westy
                          -1986 Honda Magna 700cc
                          -1989 Lincoln Town car Signature Series
                          -2011 Subaru Outback

                          Comment

                            #14
                            No just don't stall the motor. If you do wait a few minutes to let the stuff evaporate.

                            Comment

                              #15
                              great, thanks John.
                              Besides the higher idle, the coughing has stopped. I didn't pull the plugs yet, but it seems whatever was stuck is now gone!
                              "To Find yourself, you must first lose yourself"

                              -1973 Volkswagen Bus Westy
                              -1986 Honda Magna 700cc
                              -1989 Lincoln Town car Signature Series
                              -2011 Subaru Outback

                              Comment

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