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Thread: 1984 efi 302 stall issues
          
   
   

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  1. #1
    Soldiers-rod is offline CHR Member Visit my Photo Gallery
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    1984 efi 302 stall issues

     



    I got a hold of an old Grand Marquis. A 1984 model with a 302cid v-8 and throttle body fuel injection. Its got a huge issue though. It stalls all the time. When I start it it stalls unless i keep a foot on the gas, it stalls when I shift into drive, it stalls when I try to accelerate (engine dies and then comes back sometimes) and it stalls when I come to a stop.

    I've replaced the cap, rotor, wires, plugs, o2 sensor, fuel filter, air filter pcv valve and so far nothing has helped. The exhaust on the vehicle is new but there are no catalytic converters, if that might be causing issues. It does better once the engine warms up but not by much. I'd appreciate any help I can get on this one, as the only thing I know it isn't is warped heads.

  2. #2
    Matt167's Avatar
    Matt167 is offline CHR Member Visit my Photo Gallery
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    check fuel preassure. test for codes, and make sure it's injecting fuel correctly... that is the old CFI, and while it is a very simple setup. it is crude and somewhat finiky .. if needed you could hook up a holley 2bbl on that manifold with a factory duraspark II distributor and basicly have the same setup as the '83 version of that car.. IIRC it only lasted '84 and '85
    You don't know what you've got til it's gone

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  3. #3
    Soldiers-rod is offline CHR Member Visit my Photo Gallery
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    Actually the 83 had the same setup just about. Same throttle body injection and everything. I owned an 83 before I bought this 84, but I'll test fuel pressure all the same.
    "Caffeine is the glue that holds my macaroni picture together, nicotine is the magnet that holds it all up on the fridge."

  4. #4
    Matt167's Avatar
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    fuel preassure should be 15 psi, and the regulator is internal with the CFI
    You don't know what you've got til it's gone

    Matt's 1951 Chevy Fleetline- Driver

    1967 Ford Falcon- Sold

    1930's styled hand built ratrod project

    1974 Volkswagen Super Beetle Wolfsburg Edition- sold

  5. #5
    Soldiers-rod is offline CHR Member Visit my Photo Gallery
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    I ground hopped it with another fuel pump from another fuel cell and the engine still refuses to thrive. A friend said I was running in rich conditions, and I can smell unburned gas in the exhaust. I just dont know what other part it could be that would cause this, given what I've changed out.
    "Caffeine is the glue that holds my macaroni picture together, nicotine is the magnet that holds it all up on the fridge."

  6. #6
    Matt167's Avatar
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    the fuel preassure regulator in the CFI
    You don't know what you've got til it's gone

    Matt's 1951 Chevy Fleetline- Driver

    1967 Ford Falcon- Sold

    1930's styled hand built ratrod project

    1974 Volkswagen Super Beetle Wolfsburg Edition- sold

  7. #7
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    pull the egr and check to see if the gasket is burned through and check and make sure there is not a piece of carbon or other debris holding it open....ted
    I'LL KEEP MY PROPERTY, MY MONEY, MY FREEDOM, AND MY GUNS, AND YOU CAN KEEP THE CHANGE------ THE PROBLEM WITH LIBERALISM IS SOONER OR LATER YOU RUN OUT OF OTHER PEOPLES MONEY margaret thacher 1984

  8. #8
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    I would check the TPS (throttle position sensor). Sounds to me like the ECU could be out of synch with throttle demand.
    Roger
    Enjoy the little things in life, and you may look back one day and realize that they were really the BIG things.

  9. #9
    Soldiers-rod is offline CHR Member Visit my Photo Gallery
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    I'll get on all of those things tomorrow, thank-you. If nothing seems to pan out I'll start pondering the purchase of a propane conversion.
    "Caffeine is the glue that holds my macaroni picture together, nicotine is the magnet that holds it all up on the fridge."

  10. #10
    fun4me is offline CHR Member Visit my Photo Gallery
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    It sounds like the engine coolant temp sensor is bad. It will tell the pcm the engine is alot colder than it is. Sometimes showing -20 degrees. This will cause it to run rich & stall. Also make it hard to restart. As the engine warms up it will run start to run a little better. You can check the voltage to verify this. I don't remeber what the readings should be as they will change with engine temp.

  11. #11
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    Quote Originally Posted by rspears View Post
    I would check the TPS (throttle position sensor). Sounds to me like the ECU could be out of synch with throttle demand.
    We had an 84 Town Car, same engine, same problem. Had it back to Lincoln dealer bunch of times and they couldn't fix it. Finally found a little garage where the guy knew Fords. Kept the car for a few days and drove it home so he could see what was going on. He replaced the throttle position sensor and it ran like a clock. Roger may be right about what you have going on.

    Don

  12. #12
    Soldiers-rod is offline CHR Member Visit my Photo Gallery
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    Nope, it was the fuel pressure regulator. Now that I think about it its about the same as when the regulator died in my 83 a few years ago. In the 83 though the regulator spat fuel everywhere and started a fire. At the time I can remember wondering if I should be driving towards an autozone or a firehouse.

    Thanks guys. Now I have a vehicle that runs solid, came with enough spare parts to build most of a second car and it only cost me 800 bucks.
    "Caffeine is the glue that holds my macaroni picture together, nicotine is the magnet that holds it all up on the fridge."

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