Question about 1990 Ford F150

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******* gas What makes my 1990 Ford Custom 6 Cylinder 4 w/d so ******* gas I know other people that have the same truck as mine and is a lot better on gas then mine am taking something like 6 / 7 mille a gallon

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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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ef75765.jpg hope it helps.

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