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Discussion Starter #1 (Edited)
Issue: P0308 code.
I have a P0308 code/#8 misfire that will NOT go away!
I've read what seems like every page on the internet about this code but nothing seems to be working. I installed new coil, wires, plugs, cap and rotor. Swapped out #8 plug and wire, still got it. Next up, compression test... all came back fine. Low 155, High 170. Sprayed carb cleaner looking for vacuum leaks, found nothing. Ran Sea Foam thru vacuum, gas and oil (idled 15 minutes before oil change) made it run much smoother but still got the code. Injector seems to be working fine as well. Replaced upper and lower o2 sensors.
Being so frustrated, I broke down and paid $104.00 (*for nothing!) and took it to the Dodge Dealership. They had it for 2 days and also could not find the issue. They said everything seems to be working perfect for a truck that has 130,000 miles. They suggested that I replace the ECM/ECU but they weren't making any promises that that would be the issue. *Thanks for nothing guys!
Anyways, I'm at wits end on this and have to pass an emissions test ASAP. Any thoughts would be greatly appreciated.

Thank you in advance!
M.
 

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Layin Low
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1,313 Posts
first thought that comes to mind is not making more than one thread on the issue.

since you read through so every page on the internet about the issue... why make three more?

anyway... trace the wires coming from the injector all the way back to the PCM. during that, keep checking for any damage to the wire. i'm betting that it may need to be replaced or reconnected somewhere.
 

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Discussion Starter #3
Thank you for the info! I'll follow the wires looking for damage.
And thank you for the constructive criticism. Wasn't sure how the site worked.
 
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