Changed Coils all 8 and spark plugs
Didnt have this problem before
Also getting a misfire
Ford Q&AAsk Your Question
1999 Ford Expedition Question: Got a PO353 and a PO356 what does this mean
Answer #1arturo08 March 30, 2013, 02:08Master
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).
Reply915tommyboy74, March 30, 2013, 21:27Rookie
Thanks it was one of the spark plugs and one of the connectors
Answer #2pushrod March 30, 2013, 08:53Master
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.
Reply915tommyboy74, March 30, 2013, 21:28Rookie
Thanks it was one of the spark plugs and one of the connectors # 3
Replypushrod, March 31, 2013, 01:24Master
Cool, U welcom.