I have a 97 GMC Jimmy SLT with 145, XXXmi
I bought this vehicle with a seized engine and replaced it with a rebuilt engine and had it pass inspection. But would only pass while it was running because all readiness monitors would state "not ready" while the engine was off. While it was running on the other hand it 3-5 Monitors stated "ready"
I Am currently in NY and since it is november, weather is beginning to become much colder and as it gets colder, the Jimmy gets harder to start. I have ran diagnostics and each idea for the hard start and resulted inconclusive. Fuel Pump is new and turns on, Fuel Filter is clean, Fuel Pressure is at correct PSi, New Sparkplugs and wires, New Distributor cap, Just bought new battery 200 miles ago, new gaskets, All new sensors, Have correct coolant and is at correct level, Oil was just changed 400 miles ago and no metal fragments. It is to believe that possibly the memory within the ECM (computer) loses power when the key is turned to the "off" position and everything resets when that happens. Im not sure if the "stay alive" memory within the ECM was shorted when the previous engine was seized by the previous owners but I need someone to give me any other ideas to what it could be.
Also note: When turning over the engine attempts to start while turning over but doesnt cause you can feel something catching during the turnover process.
Friday, November 26th, 2010 AT 12:09 AM