Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: IAC for 1983 Turbo Coupe?

  1. #1
    Join Date
    Jun 2016
    Location
    Nebo, NC
    Posts
    3
    Feedback Score
    0

    Default IAC for 1983 Turbo Coupe?

    I have everything running well on this car except for the annoying stalling when I am off the gas while shifting. I have learned much from searching the forums on the subject. The IAC appears to be the problem. Where can I get one? No problem getting one for 1984 to 88 - but everywhere I look I am informed that those are incompatible with 1983 - although they certainly look similar. Any assistance will be appreciated.

  2. #2
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,179
    Feedback Score
    0

    Default

    Except maybe when cold, if base idle and TPS voltage are set correctly it should not be dieing even if IAC is defective... Base idle is usually 50-75 RPM less than normal idle...






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  3. #3
    Join Date
    Jun 2016
    Location
    Nebo, NC
    Posts
    3
    Feedback Score
    0

    Default

    Back to the drawing board, it seems.

    And would this then imply that the IAC is superfluous as long as I warm it up adequately? It will idle if I get off the gas gently - as when coming to a stop. It is only with the foot off the gas shifting (for example) 3rd to 2nd for corner while braking that is essentially just shuts off. No, I am not that skilled to heel and toe all of these.

  4. #4
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,179
    Feedback Score
    0

    Default

    Sounds like it could be IAC but if you bring the idle up to a normal speed it should not stall, at least when warmed up... You can set it 50-100 RPMs high without issue... Also the TPS voltage should be verified after idle is reset...


    I assume it's been scanned for codes???






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  5. #5
    Join Date
    Jun 2016
    Location
    Nebo, NC
    Posts
    3
    Feedback Score
    0

    Default

    Yes, but not by me. Time to get out the voltmeter. After a rather rigorous review of apparently relevant posts I was hoping to try the quick and easy approach first. I am getting the impression that one does not find IACs for 83 TCs and I find no information on the incompatibility with 84 - 88. Perhaps this is why the professional working on it gave up. Thanks.

  6. #6
    Join Date
    Sep 2006
    Location
    Olathe, Kansas
    Posts
    2,374
    Feedback Score
    3 (100%)

    Default

    I assume the 83 is like the others. Have you taken it off and tried cleaning the carbon off and put a new gasket on it? Checked the TPS voltage and make sure it is in range?
    Mike

  7. #7
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,179
    Feedback Score
    0

    Default

    Looking at the EEC wiring diagrams the '83 has a second feed back to computer from the IAC through a 10 ohm resistor... I dunno but possibly you could swap to a '84 computer, do away with the extra wiring and use the newer IAC...


    You checked over on NATO???






    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  8. #8
    Join Date
    Oct 2004
    Location
    Southern Maryland
    Posts
    2,549
    Feedback Score
    0

    Default

    Quote Originally Posted by TurboCoupe50 View Post
    Looking at the EEC wiring diagrams the '83 has a second feed back to computer from the IAC through a 10 ohm resistor... I dunno but possibly you could swap to a '84 computer, do away with the extra wiring and use the newer IAC...


    You checked over on NATO???
    My 83 EVTM doesn't show an extra wire with a resister to the EEC. It looks the same as the 84 EVTM.
    Check the connector and see if it has more than two wires.
    Maybe it's a question of whether you have an early or late 83.

  9. #9
    Join Date
    Oct 2004
    Location
    East Coast Virginia
    Posts
    10,179
    Feedback Score
    0

    Default

    Quote Originally Posted by softtouch View Post
    My 83 EVTM doesn't show an extra wire with a resister to the EEC. It looks the same as the 84 EVTM.
    Check the connector and see if it has more than two wires.
    Maybe it's a question of whether you have an early or late 83.
    I dunno if there is a extra wire as it's possible it's spliced in the harness... The wiring diagram does lead one to believe ther should be a extra wire or resistor connected... No doubt could be early vs late...

    The 1984 diagram I have doesn't show resistor or any connection back to pin #41...







    My other rides (that actually do run & drive)

    1969 Fairlane Cobra 428CJ 4-Speed << New 49th Birthday Picture

    1972 Comet GT - 306 C4

  10. #10
    Join Date
    Oct 2004
    Location
    Southern Maryland
    Posts
    2,549
    Feedback Score
    0

    Default

    83redbird:
    From the 84 Shop Manual:
    The resistance of the solenoid should be between 7 and 13 ohms.
    The base part number is 9F715.
    Rockauto.com list some OEM part numbers that Airtex 4J1014 replaces.
    You can see several parts numbers with 9F715 there with prefixes and suffixes attached.
    Check if any of these part numbers match your ISC. (hope yours has a p/n you can read.)
    Attached Files Attached Files

Posting Permissions

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