Truck back fires and misses after setting for a while.
I can get in the truck and drive about 10 miles and it nomally runs fine with no problems. When I get back in the truck it starts fine, no problems. As soon as I give it gas to pull out into traffic is starts back firing and missing. I put the truck in neutral floor it a few times and it's good to go. Sometimes I have to just press the gas pedal to the floor and hold it until it stops. Then it will pick up and go. I've had it in the shop three times and it's still not fixed. I've has two fuel pumps, gas taken taken off and cleaned, new plugs and wire, and distributor cap replaced.
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Re: Truck back fires and misses after setting for a...
Service engine light must be present with that description!!!!! if so time to stop the GUE$$ work and invest in a OBD 2 scan tool retrieve fault codes and repair it rite first time around.I would also be interested to see how that ignition coil behaves when it warms up get that tested!!!!if you haven't a OBD tool or spark tester invest save large.John
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Possible fuel pump problem. Check pressure at port on intake.
If the hose is long enough and made to withstand the pressure, it can lay on the windshield, held by a wiper blade to be read while driving.
Have you changed your fuel filter? When is the last time you changed your sparkplugs? Have you had any codes on the computer? Heres what I would do. First change your sparkplugs. This is a 4-6 hour job. You have to unbolt the cop(coil on plug assembly). After you change the plugs your truck will run rough. Drive it around the block then back to your house. It will take 3-5 restarts before your truck quits running rough. Reason for this is because your computer is trying to "relearn" the firing order. I have done this several times so i know what i am talking about. You can even look it up. Your 2000 expedition is a dang good truck with a great engine. After your computer relearns the firing order then the rough idle will be gone. Then I would take it out on the freeway and run it hard for 5-10 miles. If you experience a miss or two then that means you need a new cop(s). Get a code reader and it will tell you which cop is bad. Cops are expensive. I bought 6 new ones on ebay for $40. If you buy from autozone or ford dealer then you are looking at about 80-100 bucks a piece. Tell me if this helps. Ford makes a good truck and the expedition is a great truck. Mine is a 2000 expedition also. I have 248,000 miles on it and running strong with no burning oil. Good luck.
Cheapest scenario is to change the transmission filter. That is if it is an automatic. When you do this, most transmissions have a magnet in the transmission pan. If yours has one I would check it for excessive metal shavings or worse metal chunks.
You can't hold the throttle as steady as the pcm sees it. You may have a miss fire if the Generic 300 Code applies to your veh. You need a professional scanner and better yet oscilloscope on the Throttle Position Sensor under the conditions you were able to create.
I had a similar problem @105k. I had changed the fuel filter but it was still sending all kinds of codes that were related to 2 problems. Long story short, the main problem was a bad trigger assembly in the distributor (rough running) and the other was a loose engine to body ground (engine code issue). Good luck, this worked for me, now 171k.