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Deanna

Deanna 3/15/2010

1996 Ford F-150 XLT 6 Cyl 4.9L

Engine

wants to bog down and die between idle and full throttle.

changed fuel filter,pump,throttle posistion sensor,plugs,wires,cap and rotor.oil change,air filter.sometimes you start it, and it runs wonderful.

3 Answers


HouseCallAuto

HouseCallAuto 3/15/2010

Are there fault codes stored? Can you check? Gotta know what the fault codes say.

Kevin - HouseCall Auto Mechanics

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Deanna

Deanna 3/15/2010

fault codes read mass air flow, maybe cracked lines,or o-2 sensors. I removed the mass air flow, and cleaned it with carb cleaner. checked the air tubing.really old and dry, but i see no cracks.had diagnostic [email protected] pump was replaced@ mechanic.after replacing, they said it still read low pressure, and still ran the same.

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Deanna

lou 7/31/2010

buy a good fuel pump from anther store. could help .helped me. big lou t. town

HouseCallAuto

HouseCallAuto 3/16/2010

The fuel pressure has to be verified good before changing any other parts. Maybe they are reading the fuel pressure wrong and they "think" it is low. If the fuel pressure reads good the I would suspect that the mass air flow sensor is the cause of your drastic power loss. They do not always clean up, and you should never use carb cleaner in a mass air sensor. And, you had a fault code for mass air flow sensor right?

Kevin - HouseCall Auto Mechanics

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