I bought the truck used several years ago, it was in rough shape. Engine runs good but has a rough idle. Over the years I have tuned the engine, replaced injectors, fuel pump, and various sensors that I found bad. I have checked and repaired a few vacuum leaks. I replaced the transmission about 100 miles ago, everything went OK.
Recently, the engine started stalling when I stopped the vehicle. I noticed the tachometer would drop below 500 RPM when off throttle at low speed. I swapped in a used engine controller I picked up some time ago, no change in stalling. I disconnected the engine air temp sensor and it runs OK in open loop. Once the engine is warm and in closed loop operation, it stalls when decelerating or stopping. I have been checking sensors with a multimeter as best as possible. I changed the IAC about a year ago and the EGR about two years ago. I occasionally drive the truck, usually on weekends and want to keep it as a reliable back up vehicle.
Any suggestions on items to recheck or potentially replace?
Recently, the engine started stalling when I stopped the vehicle. I noticed the tachometer would drop below 500 RPM when off throttle at low speed. I swapped in a used engine controller I picked up some time ago, no change in stalling. I disconnected the engine air temp sensor and it runs OK in open loop. Once the engine is warm and in closed loop operation, it stalls when decelerating or stopping. I have been checking sensors with a multimeter as best as possible. I changed the IAC about a year ago and the EGR about two years ago. I occasionally drive the truck, usually on weekends and want to keep it as a reliable back up vehicle.
Any suggestions on items to recheck or potentially replace?
Oct 17, 2010 at 8:57 PM