How to check for a bad coil and how to replace a coil
I own a 2000 Ford Excursion V10 6.8L; about 2 months ago #3 coil went and was replaced at the dealers. I want to know how can I do this myself so I could save alot of money. It seems simple, but how do I know which one to replace right now. My truck today is not cranking up, its turning. So I asuming that another coil must have went or can I be wrong? Also I seen online(ebay) that I could purchase the coils for as low as $10 each when I paid $100 at the dealer and at the local autopart store they are going for $50 each. Should I be aware that this could be a potential not so good of a buy?
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Re: How to check for a bad coil and how to replace a coil
Hi, Yes you can replace the coil yourself. I would read any comments that is on ebay about the company that is selling the coil. You can get great deals. By the sounds of it you have coil on plug. Now to fine out which coil is gone you would have to remove one at the time have some one crank the eng and you look for the spark. Before you do this remove the fuel pump fuse. The first thing to do is to fine out if you do have spark. Here is the cyl order and the firing order.
FRONT 1 2 3 4 5
6 7 8 9 10
FIRING ORDER 1-6-5-10-2-7-3-8-4-9
Hope this helps let me know.
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Remove the plug and check the compression for that cylinder it should be between 120 psi and 150 psi, if it is low it is a mechanical issue (bad valve or worn piston rings). If commpression is low remove the valve cover and turn over the motor confirming that both valves for that cylinder are opening to there correct travel or height if not it is a faulty hydraulic lifter or worn cam. Also check the valve lash clearance the clearance is usually .012" for the exhaust valve and .008" for the intake valve to check the lash turn the motor over until the valve shuts completely for each valve, then use a feeler gauge go no go procedure. Has the wire been replaced for the plug? If this motor has coil on plug type disregard plug wire question.
SOUND LIKE THE IDLE AIR CONTROL OR MASS AIR FLOW SENSOR WILL CAUSE VECHICLE TO STALL OUT.ALSO BAD GASOLINE. BAD COILS OR BAD FUEL INJECTOR.STOPPED UP FUEL FILTER.AND A INTAKE LEAK.MANY THINGS CAN CAUSE VECHICLE TO STALL.
Could be several things, when was the last tune up? A coil may need replacing on one of the plugs and the catalytic converter could have some blockage and creating backpressure on the engine. Also fuel injectors may need cleaning by adding it to the fuel or a bad injector.