5.0 4x4 problem

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Sep 4, 2004 | 09:44 PM

narly01

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Joined: Sep 2004

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5.0 4x4 problem

Help needed. I have a 1991 F150 4X4 automatic that just does not want to go.At first I suspected the cat so I changed it and the o2's but the truck still does not want to move. Sitting at idle you rev it up and it sounds fine but take it out on the road and it accelerates flat. No check engine lights. Need some suggestions on where to go from here. Any help will be much appreciated.

Sep 4, 2004 | 11:47 PM

parks911

Cargo Master

Joined: Sep 2003

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From: Georgia

If the truck doesn't move or is hard to move regardless of your acceleration then the culprit is in the transmission area.

There are so many different things that can go wrong in the transmission it is hard to give you a pin point from the description that it won't go.

First check your transmission fluid to see if you have any in there.

Sep 5, 2004 | 07:30 AM

MustangGT221

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Joined: Nov 2001

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From: Topsfield, MA

Can you be more specific than..."it just won't move"...IE I tried different gears and while in gear it won't move the truck even though the engine is being revved up...

It's hard to understand you...if the truck doesn't move at all in gear..it's not a cat problem or 02 sensor...please be more specific

Sep 10, 2004 | 05:35 AM

narly01

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clarification of problem

Hey Justin,

What I mean is it has flat acceleration like your cat is plugged up. It moves but when you floor the accelerator and it goes nowhere.

Sep 10, 2004 | 09:16 AM

tyson1992

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Joined: Nov 2003

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First off I would really recomend the use of some verbs. I still dont know if you mean it comes to a stop when you mash the gas, or it just does not get up and go like it should, or it dies, There are lots of great people here to help, but they really need more info to help them help you.

Sep 10, 2004 | 09:22 AM

jimandmandy

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Joined: Jun 2001

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From: Running Springs CA

Two basic things to check, ignition timing and fuel pressure. This is assuming that what you mean is "no power under load".

Jim

Sep 10, 2004 | 02:24 PM

nailhead

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Joined: Sep 2004

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Replace your fuel filter, what it sounds like is your engine is starving for fuel.

Replacement pretty simple, you will need a specific tool for removing the fuel lines from the filter though. These can be had at your auto parts store too.
Its a circular clip that is inserted into the fuel line nipple to release the internal retaining ring.
Assembly is simple, just push the ends onto the filter and make sure they seated fully, you will feel it snap into place.