My 1994 E-250 won't go if I push on the gas pedal at all. I have to just touch it a tiny bit and let it slowly gain speed while holding it in low gear, until its close to 35 MPH, then shift it into second.
If I push the pedal down at all it will flood out and pour gas down the exhaust. When I let the pedal up again it runs smooth and continues on. If I push the pedal down quick and off the pedal again it will backfire out the exhaust. I can do this on demand and scare who I want.
I have replaced: MAP, EGR, Fuel pump, Fuel filter, Fuel Pressure Regulator, Oxygen Sensor, Distributor, The thing on the side fender that controls the injection based on the timing at startup, TPS, Air Intake temperature sensor and am about to try an Air Bypass Valve. I am also leery of the throttle position sensor although I unplugged it and had no change in running condition.
This has been intermittent and it would give a cough and run perfect. Then it would cough and stop running. Back and forth from one day, or minute, to the next. Now it doesn't want to kick in at all.
Anybody else ever have this problem?
Thanks for the good word.
Grant

 

Sounds like a plugged muffler or cat.

 

I was thinking the same about exhaust restriction.

Have you checked for codes?

 

Exhaust restriction was one of the first things that I thought of. I disconnected the entire system at the manifold and tried to drive it. It had no change in how it ran. Now that I think about that fact, I removed the oxygen sensor by removing the exhaust. That leads me back to the O2 sensor. It is in a crosspipe that runs between the actual exhaust pipes. I wonder if the crosspipe is plugged.

 

No, readers will read the computer.

 

You can pull codes for free using a paper clip or length of wire for a jumper. Also a test light can be used.

I can't physically see the crossover being plugged up, but stranger things have happened. If the O2 sensor isn't plugged in or threaded in where it belongs then the system is gonna drive really funky. You're basically in Limp/Fail mode while driving.

If the O2 sensor is working and where it belongs in the crossover, you need to pull codes.

Just do a search for that here or Google. Post back with your results.

I'm thinking your PCM maybe failing and just hasn't completely yet. That's why its crucial you try to retrieve codes.

 

Well that's not a surprise these days as most shops have no idea how to do anything with these trucks, but that along with all the other problems you are having could also mean the computer has a serious problem so I'd suggest taking it out for inspection to see if there are any damaged components and maybe try substituting another to see if it makes any difference. You will need a computer for the same engine/trans combo your truck has.

 

I went nuts a few years ago with a similar problem with my 351 '94 Bronco.

I had to bring it to a guy who "knew" these trucks and I got it back with the same problem.

A $25 O2 sensor fixed it in about 10 minutes. Felt like an idiot after that!