texasscot
Well-Known Member
My experience is pull coils and check for random liquid in plug holes. If dry then pull plugs and check gaps. If wet, blow air in and clean holes. Then work out where the damn liquid is coming from. On one occasion on my 5.4 it was coolant from the leaking heater control valve.
Then pull plugs and check gaps.
If plugs need changing, change them.
If plugs ok then buy set of 8 coils on eBay for $50 and use them all.
This is my 80% most likely shot.
Then pull plugs and check gaps.
If plugs need changing, change them.
If plugs ok then buy set of 8 coils on eBay for $50 and use them all.
This is my 80% most likely shot.