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Stupid electric sensors and shit...

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    #1

    Stupid electric sensors and shit...

    Ok, the last couple times I drove the '88...When I start it, the idle will surge up and down kinda drastically. It doesn't stall, but it goes way down and way up....then it evens out. Then I drive a few miles down the road and it's revving way too high, pull off and put it in park and it's screamin'.

    Once I unplugged the TPS and started it and it didn't seem to do much so I plugged it back in and it was fine. Yesterday, when I unplugged the TPS the idle got real high....plug it back in and its fine. Unplugging the IAC did nothing, didn't try to stall or anything. The IAC is brand new. DO I need a IAC???
    '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
    '95 Ford Bronco XL -

    sigpic :rebel:
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    #2
    TPS.

    My Mustang did the EXACT same thing.
    1989 Town Car Cartier: 3G Alt. Upgrade, Mark VIII Electric Fan, Police Interceptor Suspension, 40-series Flows, loaded. HO+ Conversion: E7 heads, Cobra 1.7RR's, Explorer intake, 65mm TB, FMS "E" Camshaft, 4-hole 19lb/hr injectors, A9P ECM, 76mm C&L MAF, BBK CAI. 338,000Km, stock bottom-end.

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      #3
      It worked fine today, no issues at all
      '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
      '95 Ford Bronco XL -

      sigpic :rebel:

      Comment

        #4
        If the idle did not change when unplugging the IAC, its stuck. Clean it and see what happens.
        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
          When the TPS on my 'stang was going out, it would sometimes be fine, sometimes idle at like 2,000RPM, and it was very random. The IAC made no difference either.
          1989 Town Car Cartier: 3G Alt. Upgrade, Mark VIII Electric Fan, Police Interceptor Suspension, 40-series Flows, loaded. HO+ Conversion: E7 heads, Cobra 1.7RR's, Explorer intake, 65mm TB, FMS "E" Camshaft, 4-hole 19lb/hr injectors, A9P ECM, 76mm C&L MAF, BBK CAI. 338,000Km, stock bottom-end.

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            #6
            If the engine is idling too high because the TPS is giving the wrong signal, then the IAC will be fully closed already. So unplugging it in this situation should have no effect.

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              #7
              How about actually diagnosing something. check the ECM for Codes and go from there. I can think of about 5 sensors off the top of my head that will cause the problem you are describing.
              2003 Town Car Signature - 3.27 RAR, Dual exhaust and J-mod - SOLD 9/2011
              89 Crown Victoria LX HPP -- SOLD 9/2010
              88 Grand Marquis LS - The Original -- Totaled 5/2006

              I rebuild AOD/AODE/4R70W/4R75E transmissions....Check out my Facebook page: https://www.facebook.com/pages/North...48414635312478

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                #8
                Diagnose the tps with a volt meter. Efi cars are very dependant on that signal.
                1989 Grand Marquis LS
                flat black, 650 double pumper, random cam, hei, stealth intake, Police front springs, Wagon rear, Police rear bar, wagon front ,exploder wheels, 205/60-15 fronts 275/60-15 rears, 1 5/8" headers, 2.5" offroad x pipe, Eclipse front bucket seats, Custom floor shifter, 4.10 gears, aluminum driveshaft and daily driven. 16.77@83mph

                Comment

                  #9
                  Originally posted by 88grandmarq
                  How about actually diagnosing something. check the ECM for Codes and go from there. I can think of about 5 sensors off the top of my head that will cause the problem you are describing.
                  Mine threw ZERO codes when this was occurring.

                  I checked the codes, there were none.

                  I did some research, found that the TPS can cause the issue......

                  Tested the TPS with a volt meter, it was all over the map.

                  Replaced the TPS, problem was gone.

                  I would call that diagnosing it.

                  Unfortunately, sometimes the ECM doesn't tell you what wrong, or you have one problem that causes the ECM to think there's another issue going on and then it throws a code for that instead.........

                  The OBD II cars are MUCH more intuitive in that regard.
                  Last edited by OVERKILL; 03-26-2007, 01:51 AM.
                  1989 Town Car Cartier: 3G Alt. Upgrade, Mark VIII Electric Fan, Police Interceptor Suspension, 40-series Flows, loaded. HO+ Conversion: E7 heads, Cobra 1.7RR's, Explorer intake, 65mm TB, FMS "E" Camshaft, 4-hole 19lb/hr injectors, A9P ECM, 76mm C&L MAF, BBK CAI. 338,000Km, stock bottom-end.

                  Comment

                    #10
                    If I actually had any of that shit I might. I'll get another TPS soon and fix it.
                    '89 Ford LTD Crown Vic - '92 Ford F-150 Custom -
                    '95 Ford Bronco XL -

                    sigpic :rebel:

                    Comment

                      #11
                      Carb swap!
                      lol...I wont really have to deal with that stuff after my carb swap..YAY! :banana:
                      sigpic
                      1989 Ford Crown Victoria
                      99K

                      Comment

                        #12
                        Yes, the TPS signal is important but idle is directly controlled only by the IAC. The other sensors feed info to the ECM which processes it and then controls the IAC, but if the IAC is stuck, then all the sensor input in the world isn't going to matter. If unplugging the IAC made no change to the idle, then it is not functioning properly. Clean that first, and go from there.
                        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

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