5.4 misfire
Thread Starter
|
New User
Joined: May 2014
Posts: 10
Likes: 0
5.4 misfire
Hi guys I have a 2002 f350 changed all plugs and have a misfire on cylinder 4 at 1300 to 1800. Pulled a 30 ft travel trailer 2500 to 4500 rpm no codes. I swaped injectors and no change. #4 plug was black and all others were good. Any ideas?? I changed iac ,coils ,o2 sensor,checked for intake leaks .also now and then #7 kicks up also?? Help me please!!
Thread Starter
|
New User
Joined: May 2014
Posts: 10
Likes: 0
Well 0 compression #4 valve problems I'm guessing!!
Trending Topics
Senior User
Joined: May 2006
Posts: 237
Likes: 3
Burned valve or rocker off its platform?
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
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
Senior User
Joined: May 2006
Posts: 237
Likes: 3
Did you take the AC evaporator box off to remove the valve cover?
Borrow a bore scope and look in the cylinder through the sparkplug hole. There may be a hole in the piston. If you do not have access to one put #4 on TDC and pump compressed air in and listen for where it comes out to know where the hole is. Resealing head is difficult on a Modular. If piston is damaged you would be better off installing another engine.
Borrow a bore scope and look in the cylinder through the sparkplug hole. There may be a hole in the piston. If you do not have access to one put #4 on TDC and pump compressed air in and listen for where it comes out to know where the hole is. Resealing head is difficult on a Modular. If piston is damaged you would be better off installing another engine.
Senior User
Joined: May 2006
Posts: 237
Likes: 3
Curious the mileage on this engine?
If head is reusable use the "special service" Motorcraft head gasket and clean mating surfaces with a plastic scraper and metal surface prep fluid. It will be difficult to install head in chassis without scratching it. Install new timing set.
If head is reusable use the "special service" Motorcraft head gasket and clean mating surfaces with a plastic scraper and metal surface prep fluid. It will be difficult to install head in chassis without scratching it. Install new timing set.
Thread Starter
|
New User
Joined: May 2014
Posts: 10
Likes: 0
Has 70,000 miles on it. I'm the second owner but I got it from a friend.it had a bad helli coil repair and burnt two plugs off!! I repaired the hello coil but still had the misfire.has to be the exhaust valve cause the plug was black but dry.im hoping!! Not much room to work that for sure!!