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What is the loose white wire on my 1990 coil for?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by shum1, Jan 10, 2001.

  1. shum1

    shum1 1/2 ton status

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    I got a problem on my 1990. The coil has a white lead comming off of it. It has a clip but it is not connected (never has been since Ive owned her) recently my check engine light comes on and my idle lopes between 300 and 700 rpm. The computer error code reads #42 (electronic spark timing). The funny thing is that if I turn of the key and restart it will run fine for a while before the light comes on again. Any thoughts? Thanks...
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    You probably need some new "brains" for your distributor, ya know computer stuff. The white wire is nothing to worry about, in fact its an asset. That wire is designed to run a tachometer for vehicles equipped with one. You can use it too if you put in after-market tach. Simply hook up to that one, run a wire to an ignition hot power source, another to your light switch (so it'll light up when you pull the switch) and lastly run a wire to ground it. I would say though that the problem is probably isloated to an internal distrubutor componet.

    (Please direct all hate mail to "Blazer_Boy" because I don't think "BlazerBoy" would appreciate it [​IMG])
     
  3. 90K5

    90K5 1/2 ton status

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    Sounds like an ignition module problem, or something else in there. The wire is for the tach

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     

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