85 Fleetwood FWD Won't Start! Help! - Page 2
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HT4100 4.1, 4.5, 4.9 Discussion, 85 Fleetwood FWD Won't Start! Help! in Cadillac Engine Technical Discussion; I have same backfiring problem in my 82 rwd fleetwood with the 4100. Car died a few days ago and ...
  1. #16
    akasirro is offline Cadillac Owners Member
    Automobile(s): Cadillac
    Join Date
    Nov 2006
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    Re: 85 Fleetwood FWD Won't Start! Help!

    I have same backfiring problem in my 82 rwd fleetwood with the 4100. Car died a few days ago and wont start now. I just tested the icm because of no spark but it is good, so i replaced the ignition coil. now i have a backfiring or a puff of smoke comming from the throttle body area.

    i am going to make sure the rotor is in place. what should i look for when i am trying to find TDC. carnut could you explain this for me. when i place a tool in where the no. 1 plug is and rotate the engine by hand, am i looking for the tool to move up and out or should the engine stop turning because of the tool in the plug hole?

  2. #17
    carnut is online now Cadillac Owners Master
    Automobile(s): 1988 Allante' (sold), 1984 Eldorado, 84 Sedan DeVille
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    Re: 85 Fleetwood FWD Won't Start! Help!

    With the tool inserted gently and you holding it, have someone rotate the engine. Eventually the tool will move up and then back down as the piston rotates. You want the tool to raise to the highest position BEFORE it starts to drop. At the high position you should be close to the max. compression position and the timing mark should verify that as well as the rotor position within the distributor.(you might have to rotate the engine 3 to 4 times to confirm) A slipped timing chain will still allow camshaft rotation unlike a timing belt that has broken. Chains seldom break but the timing gear will wear so much the chain slips on the cam gear.

  3. #18
    akasirro is offline Cadillac Owners Member
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    Re: 85 Fleetwood FWD Won't Start! Help!

    I really should start my own thread for my 82 fleetwood that wont start

    Finally got the distributor nut off using a 15mm distributor wrench. I was able to position the #1 piston to TDC. The Pick Up Coil was likely the original and in real bad shape, so I had to replace it. After replacing the Pick Up Coil, I repositioned the distributor the same was it came out. With everything back in place I go to start the car and nothing new... The engine rotates and I get a backfiring from the intake. I do not know what to do next.

    I tried to rearrange the plugs on the cap as they were not in-sync with the suggested firing order. I got not backfire and no attempt to start. I put the plugs back the way I found them and it backfires. What is my next step - I dont want to send it to the shop. Help fellas!

  4. #19
    fj12 is offline Cadillac Owners Member
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    Apr 2005
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    Re: 85 Fleetwood FWD Won't Start! Help!

    there is only one firing order, and one way to connect the wires, and one direction that the rotor spins. make sure that the #1 plug goes to the #1 connection on the distributor cap. check for water in the gasoline, chipmunk nest in the intake tube, blocked exhaust, only one fuel injector working, bad coil, bad plugs, bad wires, dirty air filter, bad fuel pump, bad fuel pressure regulator, or broken distributor. good luck.

  5. #20
    BrentNewland is offline Cadillac Owners Member
    Automobile(s): 1985 Cadillac Fleetwood FWD
    Join Date
    Sep 2007
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    Thread Starter

    Re: 85 Fleetwood FWD Won't Start! Help!

    Got it to run for 24 hours (after taking it to a shop). Now it'll "kind" of run if I turn it over and hold down the gas, but when I let off the ignition, it chugs a few times and dies. Any ideas? Pulled a spark plug and it's firing properly. I replaced the timing chain and gears, temp sensor, O2 sensor, fuel filter, spark plugs, MAP sensor, and the fuel pump relay.

  6. #21
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: 85 Fleetwood FWD Won't Start! Help!

    Check for fuel pressure at the nipple on the fuel rail. Do you hear the fuel pump whirring for 2 seconds before the car starts? It'll be hard to hear with the electric vacuum pump on these. Pull the connector for the vacuum pump, then listen for the fuel pump.

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