Question about 2002 Ford Expedition

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Is it normal for (4) separate coils to go out at the same time on 2002 Ford Expedition. If so what would cause it to run fine one day then next day lose massive power and find (4) bad coils over plugs

Replaced 2 bad coils didn't seem to make much difference. Found (2) more additional bad coils.

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  • Ford Master
  • 1,209 Answers

From my experience, if you get one bad coil you might as well change all 8 of them. They will just drop like flies until you do.

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

  • 85 Answers

SOURCE: new coil pack in 1998 Ford Escort failed in one week?

alright the most likely cause is the spark plug wires. put a set of wires on it and let us now how things are. good luck.

Posted on Nov 23, 2008

csmock132
  • 4669 Answers

SOURCE: Catalytic converter shot

3 front coils? Ignition coils? If the engine had a miss for a long time the excess fuel can ruin a catalytic converter.

Posted on May 12, 2009

  • 208 Answers

SOURCE: 2005 Ford Taurus Sputtering

stickingvalves collapsed lifters bent push rods fault ignition or damadged spark plug wires start it up at night look under the hood for sparks jumping from wires replace fauilty wires

Posted on Jun 22, 2009

  • 4102 Answers

SOURCE: 2001 Ford F150 5.4 runs fine cold, but loses power when hot

hi, i would get the oxygen sensor looked at first as this only starts working when the exhaust reaches a certain temp.
But as your getting the problems when the engine is up to temp then this is what i would look at first it also called a lambda sensor.
Their is no way of testing this yourself but a garage could run a test and tell you if that part is at fault.

The problem is you just need to iliminate things orderly so i would get the oxygen sensor checked first before you spend money on other parts. If this is at fault then its not expensive to replace and does cause the problem your having

Posted on Aug 23, 2009

  • 407 Answers

SOURCE: 2002 ford expedition

get a new mechanic, need to check for vac. leaks, poss needs tune up. alot O2 codes i have gotten have been created by vacuum leak or warn out plugs, rarely have i had to replace a O2 sensor.

Posted on Oct 14, 2009

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I would recheck the coil wires from the plugs and make sure they are completely pushed down.I had the same problem on my Escort.Also push down on the spark plug wires.When I try to pull off the spark plug wires,almost EVERY time one breaks and i have to replace them.Either a loose coil wire or a loose spark plug wire will cause the popping.

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Car was running ruff. missing and had no power. replaced plugs and wires that didnt fix it. then i pulled the wires one at a time from the coil pack and the #4 wasnt firing. so i replaced the coil and it...


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2002 ford expedition "service engine soon" light keeps coming on. I've had the O2 sensor replaced three times in the past month, now the next day or two after the sensor replacement the light comes back...


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I've got a 2002 Expedition that experienced the same kind of problem. Turned out that the individual load coils on the spark plugs tend to act up when they get wet (either from rain, or possibly from fluid puddling on top of the plugs). Anyways, the fix for me was to replace the load coil. The #4 and #7 plug coils seemed to cause me the most grief (seperately on two different occasions). The wierd thing is unless it gets real bad, no computer code is generated. I took it to the dealer, thinking they had some sure fire way to find the problem. After my third trip back, they were able to figure it out through elimination. The next time it happened, I just did it myself.

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