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Car has a 3 liter V6 and cylinders 1, 3, and 4.

Tiny
TRISH28
  • MEMBER
  • 2002 CHRYSLER 300
Car has a 3 liter v6 and cylinders 1, 3, and 4 are misfiring. Codes are p0351, p0353, and p0354. I've checked the voltage repaired the wiring to the (COP) which all now have 12 volts, but all 3 cylinders still misfire. Vehicle has a new PCM was installed before I acquired the vehicle. I've also swapped out each of the (COPs) on all 3 cylinders with other (COPs) and its still misfiring. Im out of options and scratching my head. Can anyone advise something new to try?
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Wednesday, March 20th, 2013 AT 11:12 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
What wiring did you repair?

What about the plugs?

Roy
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Wednesday, March 20th, 2013 AT 11:16 PM
Tiny
TRISHMILCHLING
  • MEMBER
  • 1 POST
I replaced the two splits that power the (COPs) The plugs appear to be fine but I plan to change them out. I tested at the end of the plugs.
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Wednesday, March 20th, 2013 AT 11:21 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
How many miles on the plugs?

The codes indicate missfire in first 1000 rpm at start up. Could just be bad plugs

Roy
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Wednesday, March 20th, 2013 AT 11:29 PM
Tiny
TRISH28
  • MEMBER
  • 2 POSTS
Well I know the 351-356 codes are ignition coil primary/secondary circuit malfunction. Im not sure on exact mileage but its not spark plug issues.
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Wednesday, March 20th, 2013 AT 11:36 PM

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