Mechanics

SLOW WARM UP AND POOR FUEL ECONOMY

2006 Ford Freestar

Engine Performance problem
2006 Ford Freestar 6 cyl Front Wheel Drive Automatic 26,000 miles

Just got van back from warranty service on transaxle and told service writer in 20 degree weather it took 9 miles to warm up to get decient heat. He said his tech said there was no problem (obvius in 70 degree weather) and I have never gotten over 18-19 MPG (15 MPG in winter) Thermostat? They would not replace it. (Still covered under 3-36000 warranty).
MAF sensor? IAT sensor? ECT sensor?
Any common problems with 4.2 V-6?
PCM just had a update flash
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Chevy14485
April 16, 2008.



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