Question about 1989 GMC K1500

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Need tune specs on '89 5.7 GMC - 1989 GMC K1500

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  • Garry Laing
    Garry Laing Apr 24, 2014

    Meant to say 'tune up specs' for '89 GMC 5.7 in Sierra 4x4

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  • Master
  • 427 Answers

Spark plugs are set at 0.035 inch.
Ignition timing is set at 0 degrees BTDC. The computer then controls the timing from there. There will be a wire that you unplug before you set the timing, then once you have verified that the timing is at 0 degrees, then reconnect the wire and you're done.

Posted on Jun 01, 2014

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SOURCE: tune up specs on '89 5.7 GMC

get a haynes repair manuel, worth every penny, just do it

Posted on Apr 22, 2014

Testimonial: "I know full well that Haynes or Chilton manuals contain this info! I did not want to spend the time or money to obtain manuals to get this little bit of info when someone with the knowledge could share it with me. This kind of response is not useful and is just stating the obvious."

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--------------------------------------------------------------------------
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Tune up specs on '89 5.7 GMC


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