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Codes P0301, P0303 and P0305, Misfires bank 1?

Tiny
JUSTBLESSED
  • MEMBER
  • 2013 DODGE CHARGER
  • 3.6L
  • V6
  • 4WD
  • AUTOMATIC
  • 178,676 MILES
I very recently purchased an engine and had an engine swap done. The engine had 90,000 miles on it. The old engine had constant misfires on bank 1 (1, 3, 5) which I changed the plugs and a few coils. Then I had the swap done. Fast forward to now the engine I had put in is throwing the same codes the old engine did. (P0301, p0303, p0305) the mechanic said he took the fairly new plugs I put in on the old engine out and put them in the engine I had put in. I’m trying to figure out why is the same exact problem occurring on an engine I purchased with 90k miles on it. The old engine had 178,676k miles on it.
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Tuesday, September 17th, 2024 AT 11:03 AM

13 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
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When there is a bank of misfires it is not the spark plugs, coils or injectors. The problem will be the swirl valve control, or you have a clogged catalytic converter on that side. Since your car does not have swirl valve inside the intake it just leaves the catalytic converter. Here is the location of the cat in question, check out the images (below). Please let us know what happens.
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Tuesday, September 17th, 2024 AT 4:04 PM
Tiny
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So, how would I be able to get the cat unclogged on that side?
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Tuesday, September 17th, 2024 AT 4:07 PM
Tiny
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Can I throw cataclean in my gas tank until I can get the problem resolved?
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Tuesday, September 17th, 2024 AT 4:19 PM
Tiny
KEN L
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You will need to replace it, usually the catalytic material falls apart and blocks the outlet. I don't think cat clean will work.
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Wednesday, September 18th, 2024 AT 8:35 AM
Tiny
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Should I just replace the one or both?
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Wednesday, September 18th, 2024 AT 12:48 PM
Tiny
JUSTBLESSED
  • MEMBER
  • 47 POSTS
  • 2013 DODGE CHARGER
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 178,777 MILES
Is there any way I can unclog the left side of my cat? Or should I just get new ones?
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Wednesday, September 18th, 2024 AT 5:50 PM (Merged)
Tiny
KEN L
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With 178k on it I would do both. You will need to remove the cat for inspection.
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Wednesday, September 18th, 2024 AT 5:51 PM
Tiny
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Did a back pressure test both cats are fine.
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Monday, September 23rd, 2024 AT 8:17 AM
Tiny
KEN L
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One side of the engine misfires are usually the cat. Is the intake manifold in good shape? The only other thing I can think of is the intake manifold gasket is leaking on that side, did you check for vacuum leaks?
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Monday, September 23rd, 2024 AT 9:38 AM
Tiny
JUSTBLESSED
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  • 47 POSTS
  • 2013 DODGE CHARGER
  • 3.6L
  • V6
  • 2WD
  • AUTOMATIC
  • 178,888 MILES
I just had an engine swap done because the engine that came with this car had bad valves and low compression on cylinder 5. Did the swap and the same codes are being thrown on this engine that has 90k miles. Did a back compression tests cats are fine and working properly what else could it be?
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Monday, September 23rd, 2024 AT 11:30 AM (Merged)
Tiny
KEN L
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How does the engine seem to run at idle and under power? You could have a PCM that is out and not triggering the fuel injectors or ignition coils there is a wiring problem with the injector or coil wiring, here are two guides to go over to see if the these items are receiving a trigger.

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

and

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Please go over these guides and get back to us.
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Monday, September 23rd, 2024 AT 11:35 AM
Tiny
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The engine misfires roughly at idle.
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Tuesday, September 24th, 2024 AT 11:09 PM
Tiny
KEN L
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Can you confirm triggers at the coils and fuel injectors? Please go over the guides above.
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Thursday, September 26th, 2024 AT 11:24 AM

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