P0308 code
Thread Starter
|
Senior User
Joined: May 2008
Posts: 121
Likes: 0
From: South, AR
P0308 code
Just got a new code p0308 (cylider 8 misfire); anybody know where the coil pack I need to replace is located on the 5.4 L or any other ideas would be appreciated. I've got 69K miles on my 06 fx4 so I guess it's getting close to time to replace plugs. Just want to know where coil pack 8 is located for now tho. Thanks
Thread Starter
|
Senior User
Joined: May 2008
Posts: 121
Likes: 0
From: South, AR
where is number 8 located ? So you are saying I need to replace a coil/sparkplug?
Lead Driver
Joined: Jul 2007
Posts: 7,868
Likes: 9
From: Rhode Island
I do not have nor have not worked on a 5.4, but the way I understand is that the 5.4 has a COP system or Coil Over Plug. So there is one coil for each plug. 8th cylinder should be drivers side rear cylinder.
It could be from a bad coil, sparkplug or a sticky injector. Most likely the plug or coil though. Remember, start with the cheap stuff first!
It could be from a bad coil, sparkplug or a sticky injector. Most likely the plug or coil though. Remember, start with the cheap stuff first!
Thread Starter
|
Senior User
Joined: May 2008
Posts: 121
Likes: 0
From: South, AR
Found a small leak in my exhaust, could this cause that code to come up? My truck runs fine until I go to pass or get on the interstate then it kinda stutters but eventually goes on. Bad gas maybe??? I have been running 89 & 93 octane but just recently switched to 87 cause of prices. No problems when I was running the higher octane so that could be the problem I guess?
Senior User
Joined: Jun 2003
Posts: 225
Likes: 0
From: Memphis
Originally Posted by OBD-Codes.com
P0308 Code - Cylinder #8 Misfire
Technical Description
Cylinder #8 Misfire Detected
What does that mean?
A P0308 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #8.
Symptoms
Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
Causes
A code P0308 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer
Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
Technical Description
Cylinder #8 Misfire Detected
What does that mean?
A P0308 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #8.
Symptoms
Symptoms may include:
the engine may be harder to start
the engine may stumble / stumble, and/or hesitate
other symptoms may also be present
Causes
A code P0308 may mean that one or more of the following has happened:
Faulty spark plug or wire
Faulty coil (pack)
Faulty oxygen sensor(s)
Faulty fuel injector
Burned exhaust valve
Faulty catalytic converter(s)
Running out of fuel
Poor compression
Defective computer
Possible Solutions
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.
have you looked to see where the exhaust leak is? if so, is it pre or post cat?
Thread Starter
|
Senior User
Joined: May 2008
Posts: 121
Likes: 0
From: South, AR
post cat right where the exhaust pipe is directly in the center of the truck going from drivers to passenger side. I'll add some injector cleaner and see if that works first.
Trending Topics
Senior User
Joined: Jun 2003
Posts: 225
Likes: 0
From: Memphis
something else you can try is moving the coil from cylinder 8 to cylinder 7. if the code comes back on cylinder 8, then the coil is not the problem. if it comes back on cylinder 7, then the coil is bad.
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
Freshman User
Joined: Aug 2008
Posts: 31
Likes: 0
From: Norwood, NJ
#8 Cyl. is on the drivers side all the way in the rear. If you are going to replace the sparkplug, be very carefull, it could be stuck or even break.
If you are replacing the plug, loosen it first 1/8th turn and spray some penetrating oil in the valley and let it sit for about 15- 20 min. then rock the plug back and forth till it is out. Good luck.
If you are replacing the plug, loosen it first 1/8th turn and spray some penetrating oil in the valley and let it sit for about 15- 20 min. then rock the plug back and forth till it is out. Good luck.
Thread
Thread Starter
Forum
Replies
Last Post
danyboy
1997 - 2006 Expedition & Navigator
7
Apr 12, 2016 09:31 PM
