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    Again, a problem with my Grand Marquis

    Sorry to bother you, but i've got a problem with my 1989 grand marquis LS.

    It is intermittent, sometime it works fine, sometime it wont work.

    I start the car and then when i put it in reverse or Drive, the motor stops. After it wont start. I wait 10 minutes, then it starts, i roll on the highway, and then at the first red light, the engine stops again... The starter works perfectly, in my Haines manual they say to chek the Relay...but in the 89' grand marquis, i dont find the relays(i dont think i have some).

    I think it could be a bad ground at the fuel pump, but before taking the fuel tank down, i wanted to know what you think is wrong.

    Thanks, Alex
    1989 Mercury Grand Marquis LS
    2007 Hyundai Accent

    #2
    Sounds like a couple of different problems all happening together. When it cuts out and you say it won't start again, does the starter spin, or does nothing happen when you turn the key? If the starter is not spinning, the first thing I would check is the neutral safety switch, which might explain the fact that it won't start again until you wait awhile.

    When the motor cuts out, do you have any electrical accessories working? I know I had a similar problem, and what was causing it was a frayed wire that was creating an intermittent open circuit. This wire was running from the starter relay (round thing with wires going to positive and negative terminals on the battery) around the back of the engine bay and into the passenger compartment through a rubber boot sort of near the steering column.

    When you say the car works fine sometimes and other times not, it leads me to think electrical problems. I'm sure other people with more troubleshooting skills than I will chime in soon.
    Originally posted by gadget73
    There is nothing more permanent than a temporary fix.
    91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
    93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
    Daily--07 Civic Coupe. Bone stock with 25k miles
    Wife--14 Subaru Outback. 6-speed.
    95 Subaru Legacy Wagon--red--STOLEN 1/6/13

    Comment


      #3
      ignition module or a bad connection somewhere.....i suggest a full tune up and all new filters if their age is unknown.

      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


        #4
        sounds to me as though the IAC valve is acting up and causing the stalling and the not wanting to restart might be due to a bad batter connection if stater will not turn. these cars are VERY picky about the battery connection in order to start them. my first CV would act like a dead battery and such and all i had to do was mess with where the battery cable connects to the battery to get it going.
        Addicted to 86-87 Panthers

        Comment


          #5
          Yeah, the thing is that the starter turns, but the motor wont start. Sometime it starts, but a second after, it stops.

          Thanks for your help, i didint have time to work on it, but your help is greatly appréciated.

          Alex
          1989 Mercury Grand Marquis LS
          2007 Hyundai Accent

          Comment


            #6
            Get yourself a multimeter and check your Engine Coolant Temp sensor (ECT), your throttle position sensor (TPS), and your idle air control (IAC).
            Resistance across the terminals for the ECT should be high when the engine temperature is cold, and low when it is hot.

            With the ignition on but the engine not running, the voltage drop from the +5v supply wire to the signal return wire should be between 0.2 and 1.4 volts with the throttle closed, and should be slightly lower than 4.8 at wide open throttle.

            Resistance between the IAC terminals should be between 6-13 ohms. If you don't get a reading, swap the probes around on the terminals. There's a diode that only allows current to go one way in the IAC. It probably wouldn't hurt to pull the IAC and hit it with a bunch of carb cleaner. It's more than likely gummed up.

            When you turn the ignition key to ON, but don't start the engine, you should hear a hum or whine from the rear of the car; that's the fuel pump. It'll probably shut off after a minute. If you don't hear that hum (it's pretty loud), there's something wrong with the fuel pump circuit or the pump itself. Listen for it when you're having trouble starting the car.

            Also, like Scott said, check the TFI module.

            Good luck!
            Originally posted by gadget73
            There is nothing more permanent than a temporary fix.
            91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
            93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
            Daily--07 Civic Coupe. Bone stock with 25k miles
            Wife--14 Subaru Outback. 6-speed.
            95 Subaru Legacy Wagon--red--STOLEN 1/6/13

            Comment


              #7
              Thanks, ill be on it next day off!

              Alex
              1989 Mercury Grand Marquis LS
              2007 Hyundai Accent

              Comment


                #8
                So i checked my TPS and it is working perfectly

                I checked my ECT and the values are a bit wrong, so i'll be changing it

                Were's the Idle Air Control? I dont really know what i'm looking for, so if someone can help me locate it on my 89' grand marquis, it would be greatly appreciated.

                Thanks for your help!
                1989 Mercury Grand Marquis LS
                2007 Hyundai Accent

                Comment


                  #9
                  Looking at the engine from the driver's side fender....



                  the red circle is the IAC (the long cylinder at the angle on the throttle body...

                  and the blue circle is the TPS.
                  Originally posted by gadget73
                  There is nothing more permanent than a temporary fix.
                  91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
                  93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
                  Daily--07 Civic Coupe. Bone stock with 25k miles
                  Wife--14 Subaru Outback. 6-speed.
                  95 Subaru Legacy Wagon--red--STOLEN 1/6/13

                  Comment


                    #10
                    Thanks a lot for the pic 91waggin, ill test this tomorrow since its 3:39 in the morning here.
                    1989 Mercury Grand Marquis LS
                    2007 Hyundai Accent

                    Comment


                      #11
                      Is that the Engine Coolant Temperature sensor in pink?

                      1989 Mercury Grand Marquis LS
                      2007 Hyundai Accent

                      Comment


                        #12
                        no that is the air intake temp sensor......the coolant temp sensor for the ecm is near the thermostat housing

                        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


                          #13
                          Thanks, BTW is he the singer of Twisted Sister.....STAY HUNGRY! Feel The Fire
                          1989 Mercury Grand Marquis LS
                          2007 Hyundai Accent

                          Comment


                            #14
                            yes that is dee snider mang

                            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


                              #15
                              Originally posted by lincolnmania View Post
                              no that is the air intake temp sensor......the coolant temp sensor for the ecm is near the thermostat housing
                              The ECT is actually mounted into a house, I believe.
                              Originally posted by gadget73
                              There is nothing more permanent than a temporary fix.
                              91 Mercury CP, Lopo 302, AOD, 3.08LSD. 3g upgrade, Moog wagon coils up front, cc819s in the back. KYB GR-2 police shocks. Energy suspension control arm bushings. Smog deleted.
                              93 F-150 XLT, 302, ZF 5-spd from 1-ton, 4wd.
                              Daily--07 Civic Coupe. Bone stock with 25k miles
                              Wife--14 Subaru Outback. 6-speed.
                              95 Subaru Legacy Wagon--red--STOLEN 1/6/13

                              Comment

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