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Thread: verry hard to start warm.

  1. #1
    Join Date
    Aug 2012
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    verry hard to start warm.

    Ok so i suvessfully swapped my 90 auto to a 5sp. I used a 90 5sp dash harness. Runs fine but have a chech engine light on and if i start it back up when its warm it cranks for a while and after a whill will start. When u first start up cold or halfway warm the rpm shoots up to atleast 1,500 then drops down. What sensor could this be. Or could it be less weight to turn flywheel without the torque converter. I was gonna try and lower the idle with the screw on the tb.

  2. #2
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    Could be an O2 sensor...or not Are they both still connected after the swap?

    Did you check the codes yet?

  3. #3
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    They should be. I never unhooked them last time i had one unhooked it started right uo

  4. #4
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    Not sure what code yet dosent the engine have to be at normal temp to check code. Thats what the manual said i think

  5. #5
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    It doesn't have to be warmed up to check for 'C' ~ continuous/stored codes.

    See http://www.njtacc.com/tech/eec_codes.html

  6. #6
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    Manifold absolute pressure out of range, coolent temp open circuit open, tps out of range high, air charge temp circute open, clutch switch open, fuel pump circuit open. Thoes were with key on and engine off. Didnt flash while running. Clutch switch works tho. But i didnt change the computer behind the glove box when i did the swap.

  7. #7
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    Off hand, I'd say those point to a disconnected harness or two...and/or grounds....or blown/wrong EEC?

  8. #8
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    5 Speeds and Autoboxes do not use the same EEC. Guessing most of your issues are coming from that.

    Cheers

  9. #9
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    That was what i was thinking. But i was told that since the auto runs off of throttle linkage its not controllef by the computer. But i think the computer has to know the clutch stuff. I may have to try the computer swapp. Cause it worked fine till the harness swapp.

  10. #10
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    Do you have a stick EEC yet?

  11. #11
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    Aug 2012
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    No not yet i got a parts car pulled a bunch of stuff but forgot the computer. I can get it out of the car sat i think. So their diffrent from auto to 5sp in 90?

  12. #12
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    I'm told they are different.

    See this link for part numbers?
    http://www.sccoa.com/forums/showthre...395#post291395

  13. #13
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    Check RockAuto.com one for an auto different part number for a stick.

  14. #14
    Join Date
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    Quote Originally Posted by kw90supercoupe View Post
    No not yet i got a parts car pulled a bunch of stuff but forgot the computer. I can get it out of the car sat i think. So their diffrent from auto to 5sp in 90?
    Perhaps your problem is in the ECM.
    I have a 5 speed ECM out of a 1990 if you think that's the problem.

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