i have a 2001 250 sd with the 5.4 and 250k miles. its got codes p1299: cyl. overheat prtect. p0301 and p0308: cyl 1 and 8 misfire. im wondering if they are all related i know that if that CHT sensor is damaged or faulty it will affect fuel timing which would be the result of the misfires correct ? now the truck also doesnt blow hot air so thats got me thinking maybe the cooling system is plugged up somewhere. this truck has also blown 3 spark plugs. has anyone had any experience with this problem that can lead me in the right direction or have a circuit description for that sensor so i can backprobe and make sure its good/bad. thank you in advance for all suggestions and comments.

 

Bump back to the top.

 

thanks for the response miller_feed...i have some updates...hot air is blowing through the vents it just takes a while to get warm also i hooked up my scan tool and the ect wasnt going past 200 degrees it stayed at 194 at idle and i let it idle for about 20 minutes...hey miller_feed by bump back to the top are you referring to the CHT sensor?

 

No, not a sensor. I don't know anything about the 5.4. The bump was to bring your thread to the top of the list so more people will see it and hopefully respond to it.

Good luck.

 

Another bump for you. Hope you get some help with this.

 

bump bump



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thanks for the bumps

 

wish I could help you more

 

I'll keep bumping your thread untill someone gives you some help.