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Thread: My Chump Car 1989 Supra, #32

  1. #11
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    Default Re: My Chump Car 1989 Supra, #32

    The only OBD1 code I got was a 41, for throttle position sensor. I checked the resistance between the terminals with an ohmmeter and the VTA-E2 in the closed position read infinite instead of 0.2-1.2kOhm, so I ordered a new one. Maybe it will smooth out the idle some.

    I also ordered a leak down tester, as the discoloration of the #3 spark plug is returning, although slowly. I sure hope I don't have to pull the head right away.

  2. #12
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    Default Re: My Chump Car 1989 Supra, #32

    Great thread! My friends and I have been running an 87 in Lemons and Chump for 3 years, started out with a 7mge and now it's a 7mgte, R154 and still with the 4.3 lsd diff.

    Look us up on Facebook and i've got a few video clips on youtube, we're the Supra Troopers.

    I'm hoping we can do our first full 24 hour race this year, woohoo!

  3. #13
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    Default Re: My Chump Car 1989 Supra, #32

    Leak down test was perfect on all cylinders. Also replaced the throttle position sensor, which seemed to smooth out the idle and eliminated the 41 CEL code. So now I'm going to swap out the #3 fuel injector and hope for the best.

  4. #14
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    Default Re: My Chump Car 1989 Supra, #32

    Well done and well written! Hope to see more as your racing saga continues.
    Good luck in the next race.
    Franco-


    87 White Hard Top Turbo - Wrecked and parted out

    86.5 Blue Hard Top NA - Summer Car
    ______________________________________________________________________
    -AlbertaSupraClub- -Instagram @ AbsoluteSpeed-

  5. #15
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    Default Re: My Chump Car 1989 Supra, #32

    Thanks for the compliment.

    Our next race will be the Daytona Roval, May 24. Our 7 man team has temporarily dwindled to 5, but that just means more seat time for the remaining idiots. The weather should be much warmer, so I am paying special attention to the car's and driver's cooling system. Only 1 of our drivers have ever been on Daytona, and there is no test day, so it should be an adventure.

  6. #16
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    Default Re: My Chump Car 1989 Supra, #32

    Check that the EGR is not FUBAR.

  7. #17
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    Default Re: My Chump Car 1989 Supra, #32

    Quote Originally Posted by 3p141592654 View Post
    Check that the EGR is not FUBAR.
    EGR was deleted before I got it.

    Right now the only thing I notice is a very slight/hesitation/roughness from idle to about 1800 if the throttle is opened quickly. If opened slowly, sounds smooth. Above 1800 it ramps up well.

    I still think the #3 fuel injector may be sticky. They were a set of remans we put in during the engine rebuild.

  8. #18
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    Default Re: My Chump Car 1989 Supra, #32

    7M is sensitive to vac leaks, even really small ones. A crack in the accordion tube, or small leak at a vac accessory will cause driveability issues at low engine speeds.

  9. #19
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    Default Re: My Chump Car 1989 Supra, #32

    Accordian tube is between AFM and TB? That was replaced by PO with aluminum pipe and silicone tubing. I've removed it about a thousand times while working on the car, so I've come to know it well, and it's pretty tight. All of the small diameter vacuum tubing has been replaced with silicone.

    I'm not worrying too much about low engine speeds anyway, as long as it doesn't start shutting off like it did at Rd Atlanta. It's gonna spend the majority of it's life at WOT.

    But I need to sort out the #3 plug fouling. How big a job is it to pull the fuel injectors?

  10. #20
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    Default Re: My Chump Car 1989 Supra, #32

    It's not bad I think I pulled the throttle body and it opens it up enough to change them

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