Question about 2003 Ford Expedition

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F-250 5.4 GAS MOTOR MISSES AT CRUISING SPEED

How do I isolate the bad coil? Can I disconnect them one at a time when it is acting up to check for change, or is there a specific way to troubleshoot the problem?

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If your truck is too new, that will only increase the problem.  try to find the mis fire like you said, but instead of just disconnecting the plugs one at a time, take the plug out, ground it to the block and have the wire connected, there should be a bright blue spark, a yellow or dim spark is a sign of weak spark ad cold be the missing.
if the spark brain is bad, it will cause the truck to mis fire spastically, with no rhyme or reason.
if this does not solve he problem, check for cracks in the distributor (if you have one). make sure everything is   1-dry   2-clean
if it does solve the problem, after you get it running right on a dry day with the engine hot, and running, spray some silicone sealant on everything electric, and let it dry totally before shutting off the truck.

Posted on Feb 12, 2009

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