Need help 06 5.4l misfiring code
Thread Starter
|
New User
Joined: Jun 2010
Posts: 1
Likes: 0
Need help 06 5.4l misfiring code
hey guys need advice.
Well my truck started shakin and jerking on the highway then after a while the CEL came on, so took it to get it scanned and got the P0304 code twice for the #4 cylinder misfiring.
So decided to just go ahead and change all my plugs, and yes i ran into the plugs breaking in the heads!
but anyways i got them out. Come to find out that it still shakes and jerks, of course i went ahead and put a new coil on the number 4 cyl. Ran it up and well, the jerking stopped but its still shaking and the rpm fluctuates.
Once again i went to get it scanned and now it brought up the #1 cyl. is misfiring, so yea, i went and replaced that coil also and no fix!
So in conclusion i have changed all plugs replaced coils in #4 and #1 cyl. It still shakes at idle, rpm fluctuates, and when i press down on the gas pedal it tries to stall, also the P0301 #1 cyl misfire code keeps showing up no other codes have popped up
Any ideas? I'd appreciate it
Well my truck started shakin and jerking on the highway then after a while the CEL came on, so took it to get it scanned and got the P0304 code twice for the #4 cylinder misfiring.
So decided to just go ahead and change all my plugs, and yes i ran into the plugs breaking in the heads!
but anyways i got them out. Come to find out that it still shakes and jerks, of course i went ahead and put a new coil on the number 4 cyl. Ran it up and well, the jerking stopped but its still shaking and the rpm fluctuates.Once again i went to get it scanned and now it brought up the #1 cyl. is misfiring, so yea, i went and replaced that coil also and no fix!
So in conclusion i have changed all plugs replaced coils in #4 and #1 cyl. It still shakes at idle, rpm fluctuates, and when i press down on the gas pedal it tries to stall, also the P0301 #1 cyl misfire code keeps showing up no other codes have popped up
Any ideas? I'd appreciate it
Postmaster
Joined: Jul 2010
Posts: 3,743
Likes: 2
From: Henrico, VA
I would say that you may have gotten a bad coil for the #1 plug but if the issue is still occurring you might want to consider replacing all the coils.
4x4 what I would say for you is it may be time to replace plugs and maybe the coils as well. Some people have to replace the boots as well at the same time it will just depend on what all is going on, how many miles you have your truck, and your driving habits.
4x4 what I would say for you is it may be time to replace plugs and maybe the coils as well. Some people have to replace the boots as well at the same time it will just depend on what all is going on, how many miles you have your truck, and your driving habits.
Senior User
Joined: Feb 2003
Posts: 466
Likes: 0
With new coils in #1 & #4, I believe that I would swap the #1 coil with #4. If there are still issues on #1 then check the injector followed by testing the wire harness. Also the pins push in on the conector sometimes so check those also.
Junior User
Joined: Nov 2006
Posts: 87
Likes: 0
Is there any trick to changing the coil on plugs. At 100K miles my truck misfired so a mechanic changed my plugs and truck ran fine for 5000 miles then misfired again. Had mechanic change #6 cylinder COPS and was good for another 5000 miles. Now it is misfiring again and I think I will change all of the COPS myself and was wondering if there were any tricks of the trade. Is there oil needed to lubricate or anything like that.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,509
Likes: 116
From: St James, Missouri
I like to put a little dielectric grease on the inside of the boot. Just a thin coating not a big glob. That is just a personal preference though not completely necessary.
Trending Topics
Senior User
Joined: Feb 2003
Posts: 466
Likes: 0
Is there any trick to changing the coil on plugs. At 100K miles my truck misfired so a mechanic changed my plugs and truck ran fine for 5000 miles then misfired again. Had mechanic change #6 cylinder COPS and was good for another 5000 miles. Now it is misfiring again and I think I will change all of the COPS myself and was wondering if there were any tricks of the trade. Is there oil needed to lubricate or anything like that.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Senior User
Joined: Aug 2008
Posts: 298
Likes: 0
From: Vicksburg, MS
Reid, I replaced my plugs and coils @ 71k. I used #7989 Champion plugs and #140033Accel coils. I now have 96k and it runs fine. Summit has a good price on the coils as does Jegs. They are easy to change.
Fleet Mechanic
Joined: Jul 2010
Posts: 1,354
Likes: 31
From: Winnipeg
hey guys need advice.
So in conclusion i have changed all plugs replaced coils in #4 and #1 cyl. It still shakes at idle, rpm fluctuates, and when i press down on the gas pedal it tries to stall, also the P0301 #1 cyl misfire code keeps showing up no other codes have popped up
Any ideas? I'd appreciate it
So in conclusion i have changed all plugs replaced coils in #4 and #1 cyl. It still shakes at idle, rpm fluctuates, and when i press down on the gas pedal it tries to stall, also the P0301 #1 cyl misfire code keeps showing up no other codes have popped up
Any ideas? I'd appreciate it
Did you use too much Dielectric grease on the spark plug or in the plug boot? It is only supposed to be used inside the boot's first 1/8"-1/4". I also use it where the boot joins to the coil. Remember DIE-lectric doesn't allow currant to flow. Do not use it on the plug's tip.
When you reconnected to coil connectors to the coil pacs did you check to make sure none of the weather-pac seals fell out. Without them water can get into the connectors and cause shorts.
When you originally removed the spark plugs was there evidence of water in some or all of the plug bores? If so, the Boots should be changed as they are deformed from heat and won't keep water from entering the bore which may cause misfires.
One final thing. Try disconnecting the battery for a while to reset the Keep Alive Memory, KAM. The pcm will relearn new driving parameters.
There's my ideas
Thread
Thread Starter
Forum
Replies
Last Post
nhredneck
2004 - 2008 F150
12
Feb 3, 2018 11:39 AM
97fordLVR
Explorer, Sport Trac, Mountaineer & Aviator
3
Apr 28, 2011 07:10 AM
