SL1 cylinder 1 misfire

Discussion in 'Saturn S-series' started by Rodster, Sep 29, 2005.

  1. Rodster

    Rodster Guest

    Does anyone have any suggestions on this problem. My SL1 gives a Cylinder 1
    misfire code intermittently. It rides smooth from 0-55, then from 55-60 the
    car actually shakes. The code goes away about half the time and the car
    does not shake as much, Thanks for your input.
    Rodster, Sep 29, 2005
  2. Rodster

    Bob Shuman Guest

    Some thoughts:

    1. Make sure the plugs are still good, clean, and gapped properly (oil or
    carbon build up can foul them). Also make sure the injector is firing

    2. I've seen where the injector connector just needs to be removed and then
    sprayed with some electronics contact cleaner then re-attached. I've also
    seen where an injector can become clogged and not spray the proper fuel
    pattern. A good fuel additive, like Techron, might be a cheap fix.

    3. Make sure your wires are good. The insulation can break down over time
    and not be noticeable but can cause arcing between wires or from the wire to
    the engine and result in misfires.

    4. I've seen where the coil tower pack can corrode and cause occasional
    misses. You can easily remove the plug wires and then remove the assembly
    to clean it thoroughly with a wire brush, etc. Remember to mark which wires
    go where and route them exactly as they were originally.

    5. Since you are having trouble with the misfire at higher speed, I'd also
    not rule out that it could be a fuel delivery problem. When was the fuel
    filter last changed? Could the fuel pump be starting to die and not
    delivering enough pressure?

    6. When was the air filter last changed? Although a long shot, a severely
    clogged air filter might cause the problems at higher speed you are seeing
    as well.

    7. Although not likely your problem, make sure the throttle body is cleaned
    occasionally. This usually manifests itself at idle not at high speed.

    Good luck

    Bob Shuman, Sep 29, 2005
  3. I agree with Bob's suggestions. I recently acquired a 97 SL1 which I am
    trying to sell. It had the "Service Engine Soon" light on. Autozone read
    the code, misfire on cylinder 1. Plugs were totally burned out. I put in a
    new set of plugs, light went out, but I was still getting some stumbling.
    Cleaned the ignition wire connections which were very dirty, still no
    improvement. I lightly misted the wires at night to see if there was any
    arcing, there was not. Then, on a lark I swapped in a known good set of
    wires (from my 95 SW1) and what a world of difference. Smooth as can be.
    I'll add that normally I would have ohm'ed out the wires but some idiot must
    have hid my volt/ohm meter.

    David Teichholtz, Oct 8, 2005
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