97 Sl2 Mis-fire Under Load

Discussion in 'Saturn S-series' started by forty, Nov 30, 2006.

  1. forty

    forty Guest

    I have a 97 sl2 with 127k on it and under a load it mis-fire i chec
    fuel pressure it's 36-42 from idle and when brake torqued. I als
    replace wires ,fuel filter and pcv . my next guess is fuel injector
    because i think it's fuel related because all coil pack are firing ok
    also has engine lite on for egr and cat-converter. i replace egr wit
    two use ones with no difference
    forty, Nov 30, 2006
  2. forty

    SnoMan Guest

    Have you tried a OBD2 port code scan???
    SnoMan, Dec 1, 2006
  3. forty

    BläBlä Guest

    Operating Pressure should be 40-55 psi.

    Wires should be below 12,000 ohms. Are they?

    What plugs did you use?

    Do you have egr and converter codes?
    BläBlä, Dec 1, 2006
  4. forty

    Paul Guest

    Had the same issue. went the same route with troubleshooting. Turned
    out is was a broken intake manifold gasket.

    Paul, Dec 1, 2006
  5. forty

    Lane Guest

    my next guess is fuel injectors

    Doh! Before your guessing costs you even more money and still doesn't fix
    the problem, please consider either having the codes read and/or getting a
    diagnostic performed at your local Saturn dealer. If it saves you from
    having to replace ONE part that you don't need to, it has paid for itself.

    Lane [ lane (at) evilplastic.com ]
    Lane, Dec 2, 2006
  6. forty

    Paul Guest

    I had gone through all the ECM codes. All it would say is misfire
    cylinder #1.
    Paul, Dec 4, 2006
  7. forty

    Doug Miller Guest

    Have you checked #1 spark plug?
    Doug Miller, Dec 4, 2006
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