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1994 Ford F-150 Repair Question


Topics covered: Fuel pressure, Engine, Sensor.
Mileage: 200,000 miles.

Asked on December 2, 2012

Ford F-150 Fuel pressure Problem

The tuck will not accelerate --- seem to back-fire thru the carb -- then suddenly picks up and runs fine until I decelerate.

Also If I press hard on the accelerator sometimes it will pick up and run ok. But not always. It could slow down to 10 mph.

I am not sure if the problem is fuel or some censor.

I have been unable to read the codes by jumping STO to STI ...
Avatar Asked by (pending member)

Answer

Replied on December 2, 2012

is the check engine light on??

did you check the fuel pressure??

we need the motor size

Roy

Tiny Answered by ASEMaster6371 (expert)
24,845 answers provided
Replied on December 2, 2012

1. The check engine light comes on and off

2 No i have not checked the fuel pressure. I don't know how to do that.
3. 5 liter 8 cy engine

Tiny Answered by fidahirjee
0 questions asked
Replied on December 2, 2012

try unpluging the mass air flow sensor and see how it runs.it is the sensor located in the air intake tube between the air filter box and the throttle body.let us know what happens when you unplug it and drive it.

Tiny Answered by homer1967 (expert)
415 answers provided

Replied on December 2, 2012

we need the code

we need the fuel pressure. you can rent a gauge from a parts store

Roy

Tiny Answered by ASEMaster6371 (expert)
24,845 answers provided
Replied on December 2, 2012

I disconnected the Mass Air Flow sensor. It did not seem to backfire anymore thru the carb And ran ok-- though with hesitation.

I also managed to read the codes:
1. They seem to be 3 slow flashes, -- twice.
3. Then one flash
4. Then 1 flash
5. then 5 flashes (rapid)
6. Then 7 flashes (rapid)

7 then two the flashes
8. then 1 flash
9. Then two flashes
10. 1 flashes
11. 5 flashes
12. 7 flashes (rapid)
13. 2 flashes (rapid)
14. 1 flashes
15. 2 flash

Fuel Pressure:

They did not have the tool. I can borrow it tomorrow in the morning.(may be from another branch).

I hope this is something to go by.

Thanx so much.

Fida.

Tiny Answered by fidahirjee
0 questions asked
Replied on December 2, 2012

those codes are all over the board,i still have to suggest that you take it to a shop for diagnosis,i do not want to see you waste anymore money than you already have.abnd in a situation like this there is just to much going on to be able to diagnose it over the web.thanks for choosing us to help you.

Tiny Answered by homer1967 (expert)
415 answers provided