1999 Ford Expedition Q&A

1999 Ford Expedition Question: Got a PO353 and a PO356 what does this mean

Changed Coils all 8 and spark plugs Didnt have this problem before Also getting a misfire -
Answer 1
should get compression check. possible may be loose spark plug or fouled threading. these engines have a shorter thread count which has caused several issues varying from vehicle(spitting plugs, spark plugs snapping during extraction, thread slots that are brittle and prone to cracking, etc). -
Comment 1
Thanks it was one of the spark plugs and one of the connectors Thanks again!! -
Answer 2
Check wire connections at coils # 3 & 6 possible damaged, loose connector. Check for cracked spark plug insulator, same cylinders 3 & 6. # 3 is 3rd cyl from front on pass. side, # 6 is 2nd cyl from front on drivers side. -
Comment 1
  Thanks it was one of the spark plugs and one of the connectors # 3 Thanks again!! -
Comment 2
Cool, U welcom. We try! -