1985 4100 hard starting

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HT4100 4.1, 4.5, 4.9 Discussion, 1985 4100 hard starting in Cadillac Engine Discussion; Hello, I have a 1985 Eldorado with the 4100 with 100k miles on the engine. Back in January I had ...
  1. #1
    Superboi71's Avatar
    Superboi71 is offline Cadillac Owners Member
    Automobile(s): 1985 eldorado
    Join Date
    Jun 2013

    1985 4100 hard starting

    Hello, I have a 1985 Eldorado with the 4100 with 100k miles on the engine. Back in January I had to have the ignition lock replaced and the turn signal camber replaced. The guy that worked on it, which was recommended to me, wish I didn't use him now, did the work. After the work was done, the car was hard to crank, had to pump the accelerator while cranking it to get it to start, before you didn't have to touch the accelerator and would start with just a bump of the ignition. the ECM code showed a 20 which is the fuel pump, I had the fuel pump replaced. The mechanic that is working on it (not the first guy) kept the car for a month trying to figure it out, he says if you turn the key on and wait about 30 secs to a minute the car cranks with out an issue but if you try to crank it with out the wait its still hard to crank ( like its not getting the fuel or fire) like I said the car did not act like this before the ignition lock and turn signal camber and i do understand that this is an old car so it could have been something that just happened to happen at the same time that all the work was done to it. So I am asking, since it is not the fuel pump, what else should I look in to, possibly the throttle body, distributor cap, coil, rotary button, wires, plugs, Idle air control, throttle position etc, any info would be much appreciated.

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  3. #2
    omston is offline Cadillac Owners Fanatic
    Automobile(s): 1985 Seville
    Join Date
    Jan 2014

    Re: 1985 4100 hard starting

    How does it run once it starts? Take the air cleaner off and look for injector spray when you first try to start it and after it starts. They should both fire a steady pattern. Also check your timing to see if its on the mark.

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