generator12
Senior Chief Petty Officer
- Joined
- Jul 9, 2010
- Messages
- 666
Getting a "Check Engine Light", and the code is low engine temperature. The temperature gauge in the cab is at about 1/3 scale. Plenty of heat coming into the cab, even in zero weather. Gas mileage doesn't appear to have changed, and she runs smoothly and without disruption. The only sign of a problem is the CEL.
I'm trying to discern whether it's more likely the thermostat or the temperature sensing system before I begin to open it up because I only want to do it once.
I tried an infra-red pyrometer on the thermostat housing and the highest I can come up with is 140 degrees F. I'm not sure the external surface temp. tells me much in any case, but I want to judge it against the normal operating temperature for the 4.0. The problem is that I can't, for the life of me, find that temperature spec anywhere.
Does anyone have knowledge of this engine and its normal operating temperature?
Thanks guys.
I'm trying to discern whether it's more likely the thermostat or the temperature sensing system before I begin to open it up because I only want to do it once.
I tried an infra-red pyrometer on the thermostat housing and the highest I can come up with is 140 degrees F. I'm not sure the external surface temp. tells me much in any case, but I want to judge it against the normal operating temperature for the 4.0. The problem is that I can't, for the life of me, find that temperature spec anywhere.
Does anyone have knowledge of this engine and its normal operating temperature?
Thanks guys.