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Be carefull about the T-stat. There was a $6 part (much smaller) and a $26 part, (much larger and more sophisiticated looking). Much had to do with the E X models. I have a E model which corresponds to SOHC 4.0. Strgzr

Sorry I haven't gotten back, we Sailors tend to get underway alot. Yes my heat was not real hot. More importantly, it took forever to the thing to put heat out...

I have a Scan Tool that gives live readings... Kinda expensive but before, mine only got to 1/3 the way up. Now it is just less than half way. A little higher to represent 20 degrees. Regards, Strgzr

Forgot to mention, the X runs now from 192 to 205 varying. The old one was stuck at 182 after warm up... Oh, 82K miles on the meter...later

My 99 x was getting crappy milage. Temp was only getting to 182 degrees. Put a new NAPA Therm stat rated at 195-200 degrees and WOW. Fuel milage went up significantly. Asked my Dad (Mech) about the 15-20 degree difference and fuel milage and he thought that that small variation can make a...

New therm stat installed Installed the new therm stat. Temp is 192-201 now rather than the 182 I was getting before. Verdict is out but I hope my MPG goes up a bit. Napa guy (pretty helpful fella)thought it would with a 15 -20 degree difference. Pretty painless job on my 99 SOHC "E" engine...

Hey Folks, Wondering if it is time for a new thermostat. My coolant temp stays at 180. never gets to 190 or above. MPG sucks at around 14 around town. MPG is much better in the summer. I am wondering if the thrmostat is opening too early or stuck open. Even when it is lower than 170...

Picked up a Actron Super autoscanner today. Pretty cool to monitor sensor values. Next time maybe I can save some money...

One other thought I noted that the sumbling only ocurred after the X warmed up. I guess it runs in a closed loop when warming up where by the sensors (in this case the O2) is not taken into account until after the engine is up to temp. Regards, Strgzr

No mention of fuel filter change here?

Oh yeah. I did have Autozone scan the truck. P1150 "Lack of Ho2S21 Switch - Adaptive Fuel At Limit" P1151 "Lack of Ho2S21 Switch - Sensor indicates Lean" Guess I reset the code too quick. Should have paid this more attention than I did. Kept thinking ignition/vacuum leak and other...

BTW... 99 XLT 4x4

Symptoms: After air filter change, at load 1500 RPM with soft pedal touch, symptom indicated an ingnition hesitation. Changed: Throttle Postion Sensor Air Idle Control Valve Fuel Filter NOT FIXED :confused: . Went to ROWE Ford and performed 90.00 Diagnostic. Found Driver...