#4 missfire
Thread Starter
|
New User
Joined: Jun 2011
Posts: 10
Likes: 0
#4 missfire
The plug blew out of #4 about 2,000 miles ago and was helicoiled. Now it is missfiring. I have changed the COP and the injector. Cant seem to get plug out. but I do not hear any blow by the plug like it is loose. I have no idea what to do next.
Senior User
Joined: Apr 2011
Posts: 447
Likes: 1
From: Southern Oregon
Hope your was not like mine. #4 blew......shop repaired while I was on vacation. Still had a misfire. Got it home....pulled the plug and found out they lock-tited the insert to the plug and never-seized the insert in the head. Now I have a burnt valve which everybody has told me that if they did not make sure the valves were closed on that cylinder when doing the insert....a small piece of aluminum could have been trapped between the valve and valve seat. Only gonna cost about 2K to get the head pulled and a new valve installed.
Thread Starter
|
New User
Joined: Jun 2011
Posts: 10
Likes: 0
The truck ran great for 2,000. I was climbing a steep grade a few weeks ago, and motor starting pinging like a low octane ping. Then missfire started. I was afraid of junk in valves from installation too. I havent check yet for proper spark yet, next on list.
Senior User
Joined: Mar 2007
Posts: 169
Likes: 0
Hope your was not like mine. #4 blew......shop repaired while I was on vacation. Still had a misfire. Got it home....pulled the plug and found out they lock-tited the insert to the plug and never-seized the insert in the head. Now I have a burnt valve which everybody has told me that if they did not make sure the valves were closed on that cylinder when doing the insert....a small piece of aluminum could have been trapped between the valve and valve seat. Only gonna cost about 2K to get the head pulled and a new valve installed.
Thread Starter
|
New User
Joined: Jun 2011
Posts: 10
Likes: 0
Just checked both COP and injector and both have proper electric profiles. Pulled plug and the helicoil came out with it. The electoid on plug was destroyed! Melted off! Put new plug and new insert in and started it. Blew plug/insert straight out breaking new COP. Still ran with a missfire with new plug in before it blew out.
Trending Topics
Senior User
Joined: Mar 2007
Posts: 169
Likes: 0
Mine ended up beeing #10 cylinder injector harness had bad connection.Plastic tab broke off, it is now tie wrapped.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
New User
Joined: Jun 2011
Posts: 10
Likes: 0
Well, put new plug/insert back in with JB weld with hopes to remove plug and test for compression. Let set for a couple days put COP back on and fired it up. Everything stayed in place and runs like new, well on all 10 anyhow. Ran down road and back so far no problems. Oh well couldnt hurt it anymore. We will see. Anybody want to buy a great running Excursion???
