Car has misfiring issues after sparkplug and coils have been replaced

Asked by Nicu Jan 04, 2019 at 11:51 PM about the 2008 Lincoln Navigator L Ultimate 4WD

Question type: Maintenance & Repair

2008 Lincoln navigator. I had issues with
a newly rebuilt transmission. The guy
tells me to replace all spark plugs and
coils. I do that. It works for a little while.
Then misfired code started popping up.
Cylinder 6. We change injector. Checked
if spark plug sparks. Checked
compression in cylinder. Replace
injector. Ultimately the spark plug was
the problem. Replace it and it drives
great. 2 weeks after cylinder 5 misfire.
Change sparkplug. Not even 4 weeks in
and the new oem motorcraft sp is half
melted. Change injector also. Now the
codes are saying that cylinder 5.7.8.
Coils not working. I still kept old ones so
I replaced them. Also replaced 5678
cylinder spark plugs with E3 ones.
The car still misfiring.  I'm running out of
ideas. I checked the connections to
injectors and coils. They are secured
now with a small zip tie. The clamps
holding them in are missing. Still
misfiring.

1 Answer
103,235

KenF answered 5 years ago

All great answers above. You may also want to check your injectors with the use of a noid light. misfire codes P0300, P0301, P0302, P0303, P0304, P0305, P0306, P0307, or P0308 can all be due to injectors or fuel issues. If the problem is really elusive though (not ignition or fuel related) you may want to take it in and have it ran on Fords IDS scan tool.

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