Dads 1996 GMC Extended Cab Sierra. 5.7 His truck runs good for 2 or 3 days and then it pops backfires and barley runs. He has replaced tons of stuff,runs good for a few days and back doing the same thing again. Uncle Buck said he has had trouble with the same motor on many of the same style truck with the same engine. HE Said change ditributor and the problem will be solved. So I ordered one and need to install it. He said something about a brown wire you have to un plugg before you set the timing. And then plug back after the timing is set? I need more info please.
Not sure but not only are there repair manuals available but also videos on You Tube that demonstrate how to change the distributor but also problems people run into. Sorry I can't be more specific but hope this gets you started
SOURCE: stereo wiring diagram
1999 GMC Sierra Truck Radio Wiring Guide
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
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SOURCE: I want to replace spark plugs (8) and wires on my '84 GMC pickup
here ya there my friend. first thing you should do is spark plugs / wires / rotor (sits under the distributor cap). also get a distributor cap. thats a main ignition tune up. for the rest fuel filter air filter . etc
SOURCE: 95 GMC K1500 350... replaced distributor...timed
ok ran great before changes. right. you say unpluged computor to set timing.. yes.. do you mean the plug on the firewall passenger side that looks like a fuse holder kindof..?? (set timing connector ) (tan /blk wire)
did it run good during timing proceedure??? wont be MAP that is engine vacume has nothing to do with what you have replaced.
proceedure is to set timing . shut off engine , plug in.. then restart.
yes timing moves as per ECM specs. check that timing did no get out one tooth when you replaced distributor. retime . restart
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