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Thread: 90 Engine wiring harness

  1. #1
    Join Date
    Jul 2002
    Posts
    472

    90 Engine wiring harness

    I have a 90sc aod without ERG valve. The old motor was not in the car when I got it. The engine I have now, is from a 90 sc 5speed with EGR valve.

    My question is can I use the engine wiring harness that has an EGR valve hook up. And another thing is this connector, there even if you don't have an EGR valve. This is a little grey connector. Reason I ask this is because I picked up a wiring harness off a local member and hes 100% sure its off a 91sc aod without EGR valve. It has that grey connector for the EGR valve.

  2. #2
    Join Date
    Jul 2002
    Posts
    472
    Well seems like nobody can help out on this one.

    So maybe somebody has a spare or torn down engine. If you do and its a 89-91 aod without EGR valve. Then can you please check your engine wiring harness at the back of the engine, in the middle for that grey connector. It is connected with the fuel injector wiring harness.

    Heres a pic.
    Attached Images Attached Images  
    Last edited by ShawnSC1; 08-09-2005 at 05:16 PM.

  3. #3
    Join Date
    Oct 2004
    Location
    Lake County, Florida
    Posts
    870
    I have taken EGR Valves and DPFE senosrs out of 89 and 90 cars, but not put them back in. That plug is for the DPFE sensor which has a vac line to EGR Valve.

  4. #4
    Join Date
    Jul 2002
    Posts
    472
    Quote Originally Posted by unclenick
    I have taken EGR Valves and DPFE senosrs out of 89 and 90 cars, but not put them back in. That plug is for the DPFE sensor which has a vac line to EGR Valve.
    My EEC is factory set as a 90 aod without EGR valve, and my new motor did have an EGR valve and that DPFE you are writing about.

    When you removed your EGR valve and DPFE. Didn't you need an EEC tuner?

  5. #5
    Join Date
    Nov 2004
    Location
    Brantford, ON
    Posts
    5,383
    I have a '90 AOD, and yes the harness has the connector for the EGR but I don't have EGR. I'm assuming the EEC itself has been set up to not look for the EGR valve. On my intake plenum, there is a plate that covers where the EGR valve would go.

    I would think using the harness you have is not an issue so long as you use your original EEC.

    Frit

  6. #6
    Join Date
    Jun 2002
    Location
    Southern California
    Posts
    303
    Shawn
    Here is a thread with some more info that might help. I posted a picture of the rear of a 90 engine. Look at message #7.
    http://www.sccoa.com/forums/showthre...gray+connector


    Take Care
    To ALL my fellow Veterans........Thanks!!! U.S. Navy (Corpsman) 1967 - 1971.


    1990 SC
    1997 Mark VIII LSC
    1998 F150 Lariat

  7. #7
    Join Date
    Jul 2002
    Posts
    472
    Great thanks alot guys for the help.

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