1968-Present E-Series Van/Cutaway/Chassis Econolines. E150, E250, E350, E450 and E550

2004 E150 P0302, PO316

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  #1  
Old 06-16-2022 | 09:25 PM
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2004CSOTP
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2004 E150 P0302, PO316

Hello all,

My van has the 4.6. In the recent past, it has begun misfiring at start up when cold but that quickly clears up. Today it is getting worse. It misfires intermittently at idle and at light throttle. It does not misfire under heavier load. This does not feel the same as a failed coil pack. Usually they start misfiring under heavier load and then get progressively worse. The van has 160,000 miles on it. It has had no major mechanical work. Any thoughts on this would help.
 
  #2  
Old 06-17-2022 | 04:01 AM
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JWA
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The DTC's you're reporting are directly tied to a misfire in the #2 Cylinder, P0316 is nothing more than a misfire within the first 1,000 revolutions of the engine when it begins running on its own.

You may have a low-grade misfire from a failing COP which is most likely the case here. The chassis wiring connector might have failed and is losing contact or some part of the circuit from the PCM to the #2 Cylinder is faulty.

When were the plugs last changed and the boots inspected for cracks etc?

You can swap the #2 COP to another cylinder seeing if the problem follows.
 
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Old 06-17-2022 | 08:19 AM
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I'm sure I'm going to get yelled at for this and I deserve it. I've owned the van for 80,000 miles and have never looked at the plugs. I've changed coil packs as they fail. I'm sure someone is asking why I wouldn't change the plugs while I was in there. I've heard nightmare accounts of changing plugs on these motors from stripped threads to plugs broken off in the head. I figured if it was working, why take the risk.
 
  #4  
Old 06-18-2022 | 04:08 AM
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JWA
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The horror stories you've heard about spark plugs in that motor are somewhat exaggerated because the problems you cite either do not apply to your engine or can be greatly minimized by careful removal and re-installation of the specified Motorcraft plug.

As far as the rest its your van so your choice what to do or what to neglect maintenance-wise. I've long ago stopped wondering why people neglect simple maintenance steps so good luck with whatever you choose to do.
 
  #5  
Old 06-18-2022 | 05:58 PM
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Wow, what a useless response from someone who watches too much Scott Kilmer. It turned out to be a coil pack. Keyboard warriors like this like to hear themselves type but typically know nothing.
 
  #6  
Old 06-18-2022 | 10:46 PM
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tabijan
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Ignoring plugs tends to cause premature coil failure. Something about plug gap wider than spec.

Sixto
07 E350 5.4 182K miles

 
  #7  
Old 06-19-2022 | 04:37 AM
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JWA
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Originally Posted by 2004CSOTP
Wow, what a useless response from someone who watches too much Scott Kilmer. It turned out to be a coil pack. Keyboard warriors like this like to hear themselves type but typically know nothing.
And yet you yourself had to seek answers to what is typically an easy fix with a proper diagnostic plan. You claim this didn't feel like a COP and yet it was exactly that---according to you anyway---and rather easily determined.

So that would make two of us with little knowledge ay Skippy? But again this is your van and your choice what to do or not do, not one bit my concern.
 
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