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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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  #1  
Old 08-17-2008, 06:53 PM
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jwillyf150 jwillyf150 is offline
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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
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Old 08-17-2008, 07:24 PM
Capbyrd Capbyrd is offline
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it wont be a coil pack. just a coil and it is sitting on top of cylinder number 8. the spark plug connects directly to the coil.
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Old 08-17-2008, 08:27 PM
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Quote:
Originally Posted by Capbyrd View Post
it wont be a coil pack. just a coil and it is sitting on top of cylinder number 8. the spark plug connects directly to the coil.
where is number 8 located ? So you are saying I need to replace a coil/sparkplug?
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06' F-150 FX4 5.4L 3:73L.S. Scab
2" Autospring LK
S&B CAI
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5% tinted front windows
double 20% tinted rear windows
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Old 08-17-2008, 08:38 PM
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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!
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Old 08-18-2008, 08:36 AM
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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?
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06' F-150 FX4 5.4L 3:73L.S. Scab
2" Autospring LK
S&B CAI
305/70R18 procomp xtreme m/t
5% tinted front windows
double 20% tinted rear windows
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  #6  
Old 08-18-2008, 08:53 AM
Capbyrd Capbyrd is offline
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Quote:
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.
maybe this will help get you started.

have you looked to see where the exhaust leak is? if so, is it pre or post cat?
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Old 08-18-2008, 08:56 AM
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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.
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5% tinted front windows
double 20% tinted rear windows
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Old 08-18-2008, 09:10 AM
Capbyrd Capbyrd is offline
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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.
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Old 08-18-2008, 10:45 AM
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Is the #8 located on drivers side next to the firewall?
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06' F-150 FX4 5.4L 3:73L.S. Scab
2" Autospring LK
S&B CAI
305/70R18 procomp xtreme m/t
5% tinted front windows
double 20% tinted rear windows
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  #10  
Old 08-18-2008, 10:51 AM
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yes that should be number 8
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  #11  
Old 08-18-2008, 09:10 PM
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#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.
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Old 08-18-2008, 09:10 PM
 
 
 
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