I took the connector off and used some brake cleaner and a can of compressed air to clean out the contacts on both the connector & sensor.
I then checked the coolant with a DMM. With the negative probe in the coolant at the radiator cap and the positive probe at a rusty bolt going through the core support I got an average of 0.4 VDC. I checked it numerous times and sometimes I would get 0.5VDC or greater, but usually ~0.4VDC.
After I reconnected the battery, I warmed the engine up and got a pass (111) on my code scanner. We'll see if the code returns. My mpg has been diminishing, could this be from the PCM enriching the fuel mixture?
Truck also bucks sometimes when I let off the gas (M/T), related issue?
Originally Posted by wydopnthrtl
LOL.. I like lots of things on the "right". Plolitics, religion, throttle....
Same here, lol
Thanks for all your help.
Well I took the truck for a drive and as soon as the engine went under a heavy load, goining up a hill, the CEL came on again. I have yet to understand why the CEL only lights when the engine is under a heavier load or if I shift above 3500 RPM. This is really starting to get annoying.