I can vouch for his mileage, I have a 2001 Sport and get 28 or so loaded with the kids and mountain bikes and all stuff. The ford emissions and computer system really is sensitive to changes and the readings that the computer receives. First, my upgrades, K&N Filter with air box billow removed, Bosch Platnium 4 plugs, Bosch Otimag wires, Tornado Intake insert, Higher flow Fuel filter, Carbon remover for the top of the Pistons and the Valves used regularly, Castrol 10w-30 oil with prolong additive changed every 5,000 and the K&W five minute motor flush done every other change. Should see even better mileage with the cat back exhaust coming as soon as i get out of this desert (Iraq).
The ford system has a sensor which tells the computer what the temp of the engine coolant is. That sensor gets dirty very often from not having the coolant taken care of. (can be green as the grass and still be Acidic). When this sensor ($14.00) givesthe wrong signal it tells the engine that it is colder than it actually is and that riches the fuel mixture. This intern produces excess fuel consumption, excess carbon on the pistons ( which absorbs the heat produced for a loss of power) and coats the O2 sensor with excess hydrocarbons. The O2 sensor then tells the engine to rich or lean the system and the computer begins the back and forth changes that create a very unstable running environment for maximum fuel economy. The rich fuel mixture will also be sent back into the intake system through the PCV system and that coats the intake and Idle Air Control valve with the black sludge so many cars have in the intake. That black sludge gets picked up and sent back into the cylinders, but it doesn't burn away it gets picked up by the engine oil and coats the piston rings. Once the system is dirty enough to stop the rings from sealing against the cylinder walls it produces blowby, which creates even more sludge and grunde which is sent back through the PCV system again and everything just keeps going in a viscious cycle.
1. Do the 5 minute motor flush to loosen the sludge..twice with oil and filter change.
2. replace the engine coolant sensor, not the gauge/light sensor.
3. Change coolant or test atleast.
4. Add Carbon remover, but not to excess. Pull a plug and look with a light first and then run two tanks of gas and additive (TL3 is my favorite) and then look again.
5. High quality oil and the right additive (Prolong, I have seen fix a worn engine compression along with the process).
6. Replace fuel filter every 10,000 miles like it suggest...
7. Intake filter any are better than the paper ones....
8. Switch to Platinuim 4 plugs There is no way around the best.....
9. Clean or replace the IAC Valve ($40 or so). Ten minute replacement.
10. tire pressure,tire pressure,tire pressure.........
ASE Certified and Welcome all questions?? Keep all Smart Comments for when you talk about me offline..