Coil Pack Failure?
Thread Starter
|
New User
Joined: Aug 2007
Posts: 7
Likes: 0
Coil Pack Failure?
My 01 4.6 truck is running extremely ruff, it has 130k and is probably due for a tune up. I am hoping spark plugs are the only problem but do the coil packs go bad as well? My obd2 port is messed up too so I can't scan the truck to see what is wrong. Is their any other easy way to see if one of the coils is bad? How much do they cost? The truck is shaking pretty badly and has no power to speak of. Not that it had a whole lot before.
Senior User
Joined: Mar 2003
Posts: 397
Likes: 0
From: nova scotia, canada
cops
i just repaced my cops after a long time of trying to figure out what was wrong. mine didnt set any codes. replaced all eight cops and i havent had a problem. i got mine from summit racing. very happy $$. i bought the accel coils. if your having trouble replace the plugs and the coils. dont try and replace just one coil. even if you find the right one there are others that are not far behind.
Elder User
Joined: Mar 2007
Posts: 693
Likes: 1
From: SouthWest Ga.
I take it you COP's. and yes I agree with beer boy. If one has gone bad the others won't be far behind. I recently changed the plugs in my 97-4.6 and I changed wires and both coil packs. I bought an Ignition upgrade which has all 3 items and it was cheaper than buying seperatly.
Posting Guru
Joined: Oct 2005
Posts: 2,209
Likes: 1
From: Louisville, Kentucky
Do you know if the plugs have ever been replaced? High mileage spark plugs as they wear will have an increasing plug gap. With 130K miles, if the plugs are orignal, the plug cap will be very wide. This can cause the COPs to be stressed trying to fire a plug with a gap that is too wide. COPs can fail, particularly when the engine is under load.
Therefore, you may need to replace both the plugs and the COPs to get the truck running smoothly again. Start with a good set of Motorcraft plugs. If you still have rough running issues, then replace the COPs. Good luck!
Therefore, you may need to replace both the plugs and the COPs to get the truck running smoothly again. Start with a good set of Motorcraft plugs. If you still have rough running issues, then replace the COPs. Good luck!
Thread Starter
|
New User
Joined: Aug 2007
Posts: 7
Likes: 0
I bought the plugs and should replace them tonight if all goes well. I was going to try and clean up the connections on the cops at first and hope that does the trick. If they continue I found Accel replacements at Summit for only 25 bucks a peice.
Postmaster
Joined: Nov 2006
Posts: 4,517
Likes: 3
From: SE Wyoming
You can also buy just the COP boots, which is as close to replacing spark plug wires as you can get, as cheap as aftermarket the COP's are now I'd just replace the whole thing though. It is too much of a PITA to go in to replace the plugs then do it all over again for the COP's a week later.
Trending Topics
Junior User
Joined: Aug 2007
Posts: 60
Likes: 0
Since your OBDII is on the blink you could check it old school. Unplug the coil packs one at a time and run the motor to see if there is a problem child. The #5 COP is for some reason a typical 1st to fail in the 5.4s and of course it's a PIA to get at. I also in my truck after off roading accumulate water for some reason in the same location - the probable cause of the failure.
I agree that if you are going to get in there change the plugs and the COPs but if money is a factor changes the plugs and the one trouble maker...
I agree that if you are going to get in there change the plugs and the COPs but if money is a factor changes the plugs and the one trouble maker...
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
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
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
Thread
Thread Starter
Forum
Replies
Last Post
Todd Fuller
1997 - 2006 Expedition & Navigator
23
Aug 11, 2014 12:31 PM
02 Super Duty Guy
1999 - 2016 Super Duty
5
Mar 12, 2014 09:25 AM
