Question about 1989 GMC K1500
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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Posted on Jan 02, 2017
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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