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thanks for hosting! need some help with stalling...

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    #1

    thanks for hosting! need some help with stalling...

    Hi I'm a new member from San Diego. I have spent countless hours searching for info about my cars problem and this site is definitely where i will find my answer.
    I have an 89 Grand Marquis with the original very clean efi 302 that just rolled over to 100k. The car is in really good shape and i try to give it the best of everything.
    Problem: the car will not stay running anymore. It turns over and fires fine right away but will die within 1-2 seconds. I can force it to keep going longer if I really work the throttle but I refuse to do that to my cold engine.
    Status:
    -hot spark, even while engine is dying
    -good fuel pressure at rails: 38#
    -new fuel filter anyway
    -IAC cleaned, its motor works
    -tried a refurbished motorcraft alternator, no change
    -egr not stuck
    -no check engine light, haven't checked codes

    I dont know what to do next and its getting too cold to ride my motorcycle everywhere i go. I was told it could be a camshaft position sensor, anyone know about those? Also, my research turned up the possibility of it being an engine temp sensor. The other idea i came across was the ballast resistor in the ignition, i think. again, that one is new to me. Could it be vapor lock?
    You guys are rockstars on here, if anyone can help point me in a good direction, i'd be a very grateful person.
    PS- a week ago i put a new high pressure power steering hose in, but I don't see how that could have caused the problem. Thanks guys!
    Tags: 302 won't idle, stalling
    #2
    Welcome.

    Throttle position sensor maybe??. Located right on top of the throttle body. A couple of people posted the procedures on testing those.
    ~David~

    My 1987 Crown Victoria Coupe: The Brown Blob
    My 2004 Mercedes Benz E320:The Benz

    Originally posted by ootdega
    My life is a long series of "nevermind" and "I guess not."

    Originally posted by DerekTheGreat
    But, that's just coming from me, this site's biggest pessimist. Best of luck

    Originally posted by gadget73
    my car starts and it has AC. Yours doesn't start and it has no AC. Seems obvious to me.



    ​

    Comment

      #3
      Did they use ballast resistors with EEC distributors? Maybe the TFI module, but someone with more experience will need to answer this one.

      2011 Grand Marquis LS Ultimate Edition
      Dual Exhaust w/ AP XLerator mufflers and 3 1/2" tips, Eibach 1" rear sway bar, Pioneer Head unit and speakers, 17X8 Drag DR-72 wheels

      RIP 1984 2Dr Crown Vic "The Millennium Falcon"
      Carbed 5.0 HO w/nitrous , Performer RPM intake, GT40P heads, E303 cam, FRP Shorties, FRP 9mm plug wires, Off-Road H-pipe, Magnaflow round mufflers, 2000 rpm stall
      NA-15.78@91.21, 80hp shot-14.48@96.21

      Comment

        #4
        These cars don't have a camshaft position sensor. Does it have enough gas in it? Maybe TPS like already stated

        Comment

          #5
          Sounds like a temperature sensor issue, either the coolant or air sensor. Air sensor lives on the driver's side, just behind #5 injector. Coolant is on the passenger side, in the fitting at the front corner of the manifold where the heater hose connects. Check them with a voltmeter and compare to the charts here:

          http://fordfuelinjection.com/?p=10
          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

          Everything looks like voodoo if you don't understand how it works

          Comment

            #6
            Nice site!
            And welcome to the Party!!

            -ryan s.
            08 Lincoln Navigator L - 233k
            03 Mercury Marauder- 63k
            97 Ford Crown Victoria HPP "Tank of Justice III" (TOJ3) - 194k -->578.9 miles on ONE tank of gas<--
            94 BMW 325i Convertible - 135k
            73 VW Super Beetle "Bunky" <----- Wifey's
            12 Mini Cooper S - 90k <---- Wifey's
            Originally posted by pantera77
            Well my buddy tells him he knows exactly who loves buying shitboxes.

            Comment

              #7
              gadget73, that's a really good link, thanks! My ECT reads 3.44v at 57 degrees outside. Same voltage on ACT. Can't get warm engine readings because it stalls. The TPS has a steady increase from 1v-4.45v when I rotate the throttle plate. All these readings are within spec from that link.

              Is it possible for a vacuum leak to cause this?

              One other thing that I'm thinking of is Mass Air. This car has a MAP sensor on the firewall but there was a plug that went to the original airbox before I put a K&N cone filter system on. Unplugging the airbox didnt cause any problems so I just let it go. Could that have been some kind of MAF sensor that those plugs had gone to?

              Comment

                #8
                only california boxes got mass air so perhaps


                no vacuum to the map sensor, though, will make it do exactly what you're describing. it fires seemingly fine, then just dies. throttle will let it run but it stumbles like crazy
                sigpic


                - 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims

                - 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust

                - 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock

                Comment

                  #9
                  1990LTD, That's GOT to be it. I noticed toward the end of the day yesterday that the MAP sensor vacuum hose was starting to dry rot a bit. As soon as the parts stores open again, I'll get a replacement. Is that a simple generic vac hose plug-in that I can do without removing the plenum? I knew it was gonna just be a little $1.18 part...
                  Happy Thanksgiving guys!
                  Last edited by sleeprstreet; 11-25-2010, 02:44 PM. Reason: forgot

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