Truck runs good than next day doesnt want to start, runs rough !
Truck runs good but mis-fires jerking affect, It has been to dealer changed water pump, fuel pump, pressure checked replace head gaskets. Problem comes and goes they said they need get truck when problem happens. They keep charging me for other things they find but problem still there. It intermitt problem maybe feel change complete wiring and coil, please give me feed back. Orlando
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Re: Truck runs good than next day doesnt want to start,...
Change the plugs, and plug wires first before suspecting coils. Then if no change, suspect coils, and if still no change, suspect a fuel injector. If you have a check engine light lit, you may be able to get a code from the diag computer (can be read for free from autozone I think) that tells you the exact cylinder that's misfiring. Then you can narrow your suspected choices down and focus on that cyninder for the coil and injector.
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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.
Could be the crank sensor or something in the wiring. Each cylinder has its own coil, so it would be something affecting more than one cyl. If it won't start at all now, you will have to figure out if it is a lack of fuel to the injectors or lack of spark to the plugs, or something else. Are you saying the check engine light does not come on when you turn the key on, or just not when it is running rough ?
Looks like you covered just about everything outside the engine. Since it has 225k on the engine, its possible the valves are carboned up or burned to where one of the intake valves fail to close some times. You might try a compression test or use a vac gauge when it is running rough. If the problem was not happening before you changed the plugs, you could have bought some defective ones.
First try and spray down the spark plug wires with some water from a spray bottom and see if the start arcing (you must have the truck running at all times to test this). If not that then clamp off the return fuel line and see fi anything vchanegs. let me know from there.
You still have random misfires (PO300)
You most likely replaced those coils that set a code, and those were not the one bad offender,spiking the computer module.
Take a new coil and put in a cylinder,no change, replace old coil and move new one to next cylinder. You can do that once or twice a day, if you have nothing else to do. You need a 90 degree day, to really get that solved,unless you have an ignition oscilloscope.
Never had a bad spark plug in 45 years.
It sounds like its a coilpack. Its hard to say whick one, but it can have hot fire running slow. Then when the demand go's up and running faster it fails. So it might be a little expensive but I would go ahead and replace all of em. Prob lesss than 100 tho.
This has me thinking because its an older car and iam thinking of our europeon models.But if this is a californian model ?? then i would be totally wrong.But to start with i would check the any pipes connected with the inlet manifold,for air leaks ,like the brake servo feed pipe and any small ones that work the fuel vapour thingy or the gearbox.Then if that doesnt work then get a local garage to have a look because a mechanic would have come across this before and would have a good idea what to change without a meter reading .my one suspect is the air flow meter