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Derek Werner
Derek Werner, ASE Certified Technician
Category: Chrysler
Satisfied Customers: 137
Experience:  ASE Master Technician, L1 Advanced level specialist
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2004 chry pacifica 3.5 missfire cyls 246 only, po300

Customer Question

2004 chry pacifica 3.5 missfire cyls 246 only
JA: Thanks. Can you give me any more details about your issue?
Customer: po300 andpo420 also
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Submitted: 1 year ago.
Category: Chrysler
Expert:  Derek Werner replied 1 year ago.

Hello and Welcome!

Misfire codes on cylinders 2,4,and 6 indicate a timing problem. Due to the misfire codes only being set on bank 2, bank 2 is the left bank.

P0300 is a random misfire code.

P0420 catalytic converter efficiency low. This code should be diagnosed after the misfire is fixed. Misfires can set a false po420 code to set.

For your next step i would recommend performing a compression check on the engine to confirm that the timing is off. bank 2 compression readings cylinders 2,4,and 6 will be low compared to bank 1 cylinders 1,3,5

Or you can remove the front timing cover and verify the timing marks are correct.