Question about 1990 Ford F150
If it has a history of poor gas mileage I'd check the axle ratio. There is a two digit code on the driver side door frame which designates the lgear ratio. For example and 18 is a 3.08, a 19 is a 3.55. I found these once on the net. The higher the ratio the poorer the gas milage but you should have more power.
If this developed recently I'd check the air filter. If it smokes you may have worn rings. Your temp sensor to the computer may be sending a "cold" temp to enrich the mixture. Your brakes may be partially engaged, especially the parking brake which may bind due to corrosion in the cable. If it seems to run well but lacks power you may have a clogged catalytic converter.
Hope this getes you starteed.
Posted on Jul 29, 2008
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