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Random Misfire Codes


Monty in Calgary

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Canada Military - Veteran
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Location
Calgary, Alberta, Canada
Vehicle Year
2006
Make / Model
Ford Ranger Spt
Engine Type
3.0 V6
Transmission
Automatic
2WD / 4WD
2WD
A mechanic buddy replaced all spark plugs, all plug wires, and coil pack.

Started getting multiple misfire codes about 2 weeks ago. RANDOM, particular cylinders (4,5,6), Misfires on Startup. Code reader says Severity 2 out of 3.

Mechanic buddy figured faulty coilpack. Took out the cheaper coil pack and replaced it with an OEM one.

Drove the truck a few times for two days. No codes. "Felt" like it was running fine. TODAY, however, all those same codes showed up again. Had the code reader in the truck. Recorded and then cleared the codes, drove home, no new codes.

Any ideas? I'm at a loss as to how to diagnose this.
 


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franklin2

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Bronco II
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Manual
Did he gap the plugs or just stick them in? If the gap is a little wide it will cause a misfire. You can also take each wire off and take a ohmmeter and check them. They are fairly delicate and easy to pull the terminals out of the ends. It's just some cord with graphite stuff in the cord to carry the spark.
 

Monty in Calgary

New Member
Canada Military - Veteran
Joined
Dec 17, 2020
Messages
8
Reaction score
0
Points
1
Location
Calgary, Alberta, Canada
Vehicle Year
2006
Make / Model
Ford Ranger Spt
Engine Type
3.0 V6
Transmission
Automatic
2WD / 4WD
2WD
Thank you. I'll check in to that stuff. :)
 


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