#1 misfire
Moderator
Joined: Jul 2011
Posts: 6,506
Likes: 655
From: Sioux Falls Area
Could be the plug, injector, or wiring to the coil and/or the injector.
I'd try to verify that the coil and injectoris getting the signal to fire from the pcm before throwing more parts at it hoping something sticks.
I'd try to verify that the coil and injectoris getting the signal to fire from the pcm before throwing more parts at it hoping something sticks.
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
The other wire in the coil and injector connectors go to PCM where it will be grounded/opened at the appropriate times to fire the coil or injector.
The 12v power to run the coil and injector can be traced to the PCM input connector to see if the wire is not broken.
With 12v getting to the PCM control lines properly the only part left is the grounding component inside the PCM.
The injector may be clogged or not responding so swapping the injector with #2 might help isolate the problem.
5th Wheeling
Joined: Dec 2017
Posts: 44
Likes: 0
My remedy
I changed all the coils and injectors problem solved
Fleet Mechanic
Joined: Feb 2011
Posts: 1,812
Likes: 88
From: Thousand Oaks, CA
A misfire can easily be one degraded $3 spark plug boot or water inside the boot.
Once a misfiring cylinder is identified tracing the problem is fairly straight forward.
Checking the wiring is easy and low cost.
New plugs and boots aren't that expensive.
The coils rarely go bad, but can.
Injectors are even more less likely to be worn out.
Finally, the PCM may have a bad component, is not easily repaired, so is usually replaced.
Once a misfiring cylinder is identified tracing the problem is fairly straight forward.
Checking the wiring is easy and low cost.
New plugs and boots aren't that expensive.
The coils rarely go bad, but can.
Injectors are even more less likely to be worn out.
Finally, the PCM may have a bad component, is not easily repaired, so is usually replaced.
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