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2008 3.5L dodge misfire-cannot solve
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Rbdeal
Novice
Dec 13, 2014, 4:20 PM
Post #1 of 12
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2008 3.5L dodge misfire-cannot solve
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Hi everyone,
I have a 2008 dodge magnum SXT (3.5L HO) that has a cylinder 1 misfire I simply cannot solve. Originally when the misfire cropped up I changed the injector and all was good for about 10k miles. Then it came back-cylinder 1 misfire ; open circuit to injector one. At this point I have: changed injector twice, swapped coil packs, checked voltage to injector (good), had successful compression tests on 1, 3, @ 5 cylinder, cleaned egr valve, replaced PCM, replaced rocker arm assembly, sea foamed, took to dealer for diagnostics (told me to fix rocker arm & injector), replaced spark plugs. No change. Someone. Please. Help.
RB
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 13, 2014, 4:24 PM
Post #2 of 12
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Re: 2008 3.5L dodge misfire-cannot solve
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What code number is it setting now?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Rbdeal
Novice
Dec 13, 2014, 5:08 PM
Post #3 of 12
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Re: 2008 3.5L dodge misfire-cannot solve
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Hey Hammer Time,
Today I replaced the Rocker arm assembly and the injector for the third time. After I got up to temp the P0201 came back. No P0301 at this point.
Thanks!
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Hammer Time
Ultimate Carjunky
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Dec 13, 2014, 5:11 PM
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Re: 2008 3.5L dodge misfire-cannot solve
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So, you aren't getting the open injector circuit code any more?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Rbdeal
Novice
Dec 13, 2014, 5:12 PM
Post #5 of 12
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Re: 2008 3.5L dodge misfire-cannot solve
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Correct.
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Hammer Time
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Dec 13, 2014, 5:15 PM
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Re: 2008 3.5L dodge misfire-cannot solve
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Why would you replace the rocker arm? You said you had perfect compression. It sounds like you are back to square one and you are going to have to somehow determine if it's spark, fuel or compression causing the misfire before you can begin to find the cause.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Rbdeal
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Dec 13, 2014, 5:20 PM
Post #7 of 12
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Re: 2008 3.5L dodge misfire-cannot solve
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Rocker arms commonly fail on this engine. Mine had the symptoms so i was hoping the Lashes had failed causing the valves to incorrectly open, ashing injectors. And a correction: P0201 is the open circuit fault. However; voltage is good to the injector, continuity checks out in the wiring, and the PCM is brand new. Really having a good time with this one...
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Hammer Time
Ultimate Carjunky
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Dec 13, 2014, 5:23 PM
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Re: 2008 3.5L dodge misfire-cannot solve
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What are you saying? Are you getting a 301 or a 201?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Hammer Time
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Dec 13, 2014, 5:44 PM
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Re: 2008 3.5L dodge misfire-cannot solve
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That changes everything. If you have changed the injector and the PCM, that only leaves the wiring in between or the connectors. It's not unusual for the pins to have a poor contact or a bad connection where the wire attaches to the metal terminal. You might want to experiment using an overlay wire attched at both ends by backprobing the connector.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Rbdeal
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Dec 14, 2014, 12:15 AM
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Re: 2008 3.5L dodge misfire-cannot solve
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I was wondering about that today. I'll give that a shot. Because yea, where else could it be? Thanks HT.
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Rbdeal
Novice
Dec 15, 2014, 9:04 AM
Post #12 of 12
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Re: 2008 3.5L dodge misfire-cannot solve
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I also wanted to point out that when the engine is cold it runs perfectly. Once it's up to temp the problem occurs, and on subsequent starts with a warm engine.
I did take some contact cleaner to the terminal and it seemed to help, but not solve the issue. Still need to Back probe and experiment with an overlay wire. Again, appreciate the help.
RB.
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