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1990 GMC suburban 350 TBI timing

This is a discussion on 1990 GMC suburban 350 TBI timing within the Technical / Maintenance forums, part of the General Discussion category; I need to set the timing on this engine,(totally stock snow plow truck). a mechanic told me to set it ...

  1. #1
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    Question 1990 GMC suburban 350 TBI timing


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    I need to set the timing on this engine,(totally stock snow plow truck). a mechanic told me to set it at 0 degrees after disconnecting a tan wire with a black stripe near the distributor or back of the driver side valve cover to disable the advance signal from the advance module, I cannot locate tan wire with a male/female disconnect, the only wire back there with a disconnect is a purple wire,that is way down behind cover and I can only touch with the tip of my finger,any help out there locating the correct wire???, thanks.

  2. #2
    GMC RULZZ NEUMANNZZ's Avatar
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    Re: 1990 GMC suburban 350 TBI timing

    just follow the tan black wire from the distributor.
    O2 GMC RCSB 4.8L V8 AUTO 3.73's
    rebuilt/beefed up 4L60E(at 43,000miles)
    Matching Ninja 500r


  3. #3
    Ill cut you... MeanGreen95's Avatar
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    Re: 1990 GMC suburban 350 TBI timing

    May be behind the black plastic cover on the passenger side firewall or like mine and behind the glovebox and under the dash.

  4. #4
    Registered User CChase's Avatar
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    Re: 1990 GMC suburban 350 TBI timing

    It's under a big black plastic piece on the firewall that holds all the fusible links.
    1993 C1500, 5.0L, 372,000mi
    2006 GTO, 22,000mi

 

 

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