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Thread: Engine bucking issue

  1. #31
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,294
    Quote Originally Posted by 90 red sc View Post
    Pulled codes. KOEO 11. KOER. 41. 91 77 74. No check engine light came on.

    You may recall the following items have been replaced
    Plugs and wires DIS Cam sensor battery is less than 2 months old. Also starter and relay have been replaced. Tach still not functioning as it use to.
    The KOEO code says no issues. KOER codes make me wonder if the engine was warmed up fully before testing.

    About the tach - remind me, was that an original issue when the bucking happened, or did it start right after new DIS and cam sensor, or? Did you use the paste on the bottom of the DIS when you installed it?

  2. #32
    Join Date
    May 2004
    Location
    Marlton, NJ
    Posts
    136
    I notice the tech issue when this started. Yes I put dielectric on the DIS. Could it be crankshaft sensor ?

  3. #33
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,294
    When starting, is the upshift light on in the dash cluster?

    Without more evidence, it could be a number of things. Interesting this happened after new items.

    What kind of shape is the electrical harness in that connects to the DIS and cam sensor? Any damage or oil soaking?

    Can you check the crank pulley to see if it wobbles or feels loose?

  4. #34
    Join Date
    May 2004
    Location
    Marlton, NJ
    Posts
    136
    No upshot light at start. Wiring harness not in best of shape. No oil soaking or issue with dampner. Any place to get replacement wiring harness or do you have to rebuild from scratch?

  5. #35
    Join Date
    Jul 2005
    Posts
    382
    Quote Originally Posted by 90redsc View Post
    No upshot light at start. Wiring harness not in best of shape. No oil soaking or issue with dampner. Any place to get replacement wiring harness or do you have to rebuild from scratch?
    Good morning


    Check the routing of DIS harness connectors cam/crank sensor and the supercharger belt. An improperly routed harness can "rub" and eventually chafe through the wires. As for a replacement harness (other than the salvage yard) try the wanted/sell section of SCCOA, SuperCoupe Performance and or Spinning Wheels restoration section.


    Good Luck.

  6. #36
    Join Date
    Oct 2012
    Posts
    34
    I'll check the wiring as you indicated and see what I find. If wires need replacement, do you know what gauge it would be?

  7. #37
    Join Date
    Dec 2007
    Location
    Salem, OR
    Posts
    6,294
    The harness includes shielded wiring and has to be correct, just like factory. I'd do my best to find a replacement instead of trying to make one up. Check with the vendors sources Sam listed.

  8. #38
    Join Date
    Oct 2012
    Posts
    34
    ok thanks for the help

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