Originally Posted by Matts ford
what motor and mileage? when was your last tune up if ever? may be time for it. if you noticed no power difference then that could meen that your so use to how its been running and the gaps on your plugs could be getting too large and the light has decided to come on now because it lost the power and you didnt notice because it lost power very slowly. just a thought.
5.4L 3v with about 100k kms. Just changed the plugs a few months ago. I installed the efans about a month ago and was monitoring the temperature of the CHS and it ranged from 190 to 202 F. Never 230-240 F. I did find another post that said the fail safe mode is at 258 F so I never actually got that high. The message I got was probably more of a warning cause I know I was running on 8 cyclinders. Either way, I don't believe the numbers I'm getting from the temperature sensor and I want to test it for accuracy. I'm hoping someone has the temperature vs resistance chart and knows where the wiring might be exposed so I can measure the resistance.