engine still shuddering
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Joined: Jan 2017
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engine still shuddering
Hello again, well my new to me 04 4.6 shuddered and misfired really bad last week, got couple misfire codes. I changed plugs which were really bad, like burnt out to .080, got a HEI ignition tester and got a healthy spark from all the coil packs. Drove it today and ran much better but still would shudder under acceleration when cold, wasn't as bad when warmed up but still noticeable. I thought if I got a spark with the tester that means the coil is ok? or is that not the last word in coil health. Or should I look somewhere else like injectors ? Haven't got any codes since plug change.
Frustrating...
Frustrating...
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Joined: Jul 2005
Posts: 11,931
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My 2002 5.4 gets a misfire once a year and it is ALWAYS THE COIL... My daughters 2006 4.6 had a reandom misfire for several months. I changed the coil a couple times.. In the end, it needed a new set of injectors........ I think injector problems are more common on the 4.6 and COILS are more common on the 5.4 .... just my opinion.
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