Perplexed in CC. Have a 1993 GMC Sonoma 4x4 with 4.3 "W" engine that spits and sputters. Have changed out the spider injectors, fuel pump, fuel filter, etc....Nothing helps! Took it to GM dealer for analysis, said it was the injectors. New injectors, same problem....No computer codes display....
Played with the PCM wiring harness through the firewall to computer...Engine problems cleared up like a broken wire or something. Lasted about 6 hours then went into same slump. No power, back-firing, loping.....
The only thing I haven't replaced is the computer itself. Does anyone have or know where I can find a reliable wiring diagram for this year/model.......Dealerships are not to cooperative.... Would appreciate some help....Driving me crazy and into the poorhouse with parts cost!
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Mr. Fixit
Hey,
Try this site.
https://www.alldata.com/vehicle_owner/index.html
Go to the bottom of the page, click on and read through the tech tip articles. One of the articles was similar to the problem you're having. This guy explains things very well. I think this will definitely help you. Good luck.
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