99 f150 blown plug and smoking - Ford Forums

westleveepits · 06-18-2009, 12:45

i got a 99 f150 5.4.. it blew a plug out. repaired that. now it smokes like a freight train out the exhaust when i drive it. idles bad but dont smoke at idle. runs good when drivin but smoke. any help?

Steve83 · 06-18-2009, 19:21

Which kind of "blown plug" was this: stripped threads in the head, or siezed plug shield? How did you repair it? What color is the smoke? Does it consume oil? Coolant? Any fluid leaks? MPG? After a drive, is either cat glowing noticeably?

westleveepits · 06-19-2009, 05:54

stripped the thread. use a helicoil and replacedspark plug. its blue smoke. nothin leakin.

Steve83 · 06-22-2009, 16:41

Helicoil isn't effective in this application - you need TimeSert. Click my '99 CV in my sig & look thru the Spark Plug album.

Blue smoke generally comes from motor oil entering the combustion chamber. How did you clean out the cylinder after tapping for the helicoil? If you left any shavings in there, the rings are probably ruined.

dthompson · 06-29-2009, 18:49

You did not mention how many miles are on the truck, but it sounds like the compression rings and oil ring is worn out and letting oil pass. Do a compression test on all the cylinders to find out which one is low.