FRAMING JOHN DELOREAN - ON VOD www.framingjohndeloreanfilm.com
Page 4 of 4 FirstFirst ... 2 3 4
Results 31 to 34 of 34

Thread: High idle cold start --sorry

  1. #31
    Senior Member 82DMC12's Avatar
    Join Date:  May 2011

    Location:  Olathe, KS

    Posts:    1,137

    My VIN:    11596

    Quote Originally Posted by glockworks21 View Post
    So after cleaning and testing everything and all the research i came across a picture of throttle spool spring and realized mine was either an old style or something rigged up from previous owner. I changed out the spool spring and cold started it today and it jumped up for a second but then dropped down as soon as i threw a rev. then it hunted for about 30 seconds but stayed under 1k rpm. Huge improvement from before! Maybe something to do with what Parzival mentioned earlier in thread? tensions on the springs? Its only been one cold start try but i am hopeful its fixed.
    Last question for the week hopefully, I ordered the other return spring(pic) seems as though I have to tear a lot apart to get to that bolt. Any suggestions on easy way to replace it?

    Thanks


    Dave T.
    In the first picture, you can increase the tension on the top spring for the throttle spool by holding the spring and lifting it out of the two channels it's currently in, and rotate the top of the spring clockwise so that it fits into the next pair of channels. Does that make sense?

    In the second picture, you will need to remove the throttle body from the car in order to adequately service (grease) that spring. You'll have to remove the W-pipe, disconnect the two wires from the back of the idle speed microswitch, and disconnect the linkage from the lever that hits the idle speed microswitch. Remove the vacuum hose from the bottom of the throttle body. Then remove four allen cap screws to remove the throttle body with the black bellows attached. Now you can work on it on a bench.

    Andy
    Andy Lien

    VIN 11596 Jan 1982 build - owned since Nov. 2000!

    Photography and Backpacking is life.

    Was Fargo, ND
    Now Olathe, KS

  2. #32
    Senior Member Rich's Avatar
    Join Date:  May 2011

    Location:  San Francisco Bay Area, Calif.

    Posts:    1,914

    My VIN:    0934

    Club(s):   (NCDMC) (DCUK)

    Quote Originally Posted by glockworks21 View Post
    Last question for the week hopefully, I ordered the other return spring(pic) seems as though I have to tear a lot apart to get to that bolt. Any suggestions on easy way to replace it?
    Andy posted good answers for both of those springs.

    The spring on the throttle butterfly shaft (much harder to replace than the spool spring) might not need attention. Yours doesn't look like a PO tried to grease it up and it looks pretty clean.

    These springs don't "lose tension" over time so if it was installed correctly and is as clean as it looks then it's probably delivering the design torque to the shaft linkage already and there is little need for a new one. The coils seem to have space between them, not gunk, so very little friction there. To be extra sure you can blast its coils with aerosol brake cleaner right where it sits. Fully open the throttle linkage by hand to get at more of the coils for cleaning.

    Final check: Does the throttle linkage arm with the "idle screw" on it now bottom out reliably against its stop every time your foot's off the gas? And the idle control circuit is engaged in that condition? Then there's no need for mo-better springs.
    March '81, 5-speed, black interior

  3. #33
    Senior Member
    Join Date:  May 2011

    Posts:    594

    Did you already test a known good idle ECU ?

  4. #34
    Junior Member
    Join Date:  May 2022

    Location:  sacramento area

    Posts:    21

    My VIN:    6900--

    Cool

    thank you for all the help. a lot was cleaned up and tested. I think the bulk of the problem was that tension on that old style throttle spring. The high idle seems to be fixed! I will be posting my next issue in a moment.. )

    Thanks!

Page 4 of 4 FirstFirst ... 2 3 4

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •