1992 GMC S-15 mileage: 95,000. I am having a repeating problem with ECM. Engine check light comes on. Engine runs so rough I cannot drive it. Original problem occurred driving 60 mph on freeway, engine light came on, lost power but made it ten miles home. The computer code is always 2-3 (mixture control solenoid). Over last five months I have replaced: mixture control solenoid, oxygen sensor, ECM (3 times), entire carburetor, added ground wire from ECM to firewall engine to firewall. It has been to a local shop and to a Chevy dealer. The truck has a remanufactured long block with about 5,000 miles on it. New fuel and water pumps were installed at engine replacement. Within last eight months alternator, starter, and battery were replaced. The truck still does not run reliably. ECMs have been lasting three to thiry days. I tried to find a replacement wiring harness and its not available from dealer. Any suggestions?
Monday, January 10th, 2011 AT 9:30 PM