Cylinder 4 misfire only under extreme load - Page 2 - Taurus Car Club of America : Ford Taurus Forum
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post #11 of 12 (permalink) Old 04-11-2019, 08:28 AM
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Originally Posted by kbrown View Post
thanks. compression was in the 140-150 range....a bit less than the other cylinders, but not much. engine has 385k on it, so pretty good compression, all things considered.
One cyl missing under load: plug, wire, fuel injector.


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post #12 of 12 (permalink) Old 04-14-2019, 06:23 AM
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Fuel pressure under load check is next. I'm assuming you already have a new fuel filter in place before pressure test under load.
I would wiggle the engine harness also with it idling as motor moves under load could be a harness issue.

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