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Old 12-21-2014, 02:48 PM   #1 (permalink)
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Default Cylinder 6 Misfire - P0306

Need a little help here! Long story. Daughter received the code and vehicle was missing. (on way home from college).
Verona has less than 94K Miles. I'm original owner.

Read the code and P0306 displayed - Cylinder 6 Misfire.

This is what we have done so far, and the problem still exists.

Replaced spark plug and test plug. $ 4.00 OK
Replaced ECM (used $125)
Removed fuel injector, cleaned and tested - OK

NOT sure where to go from here.

Any ideas?

Thanks in advance,

Jeff
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Old 12-21-2014, 03:04 PM   #2 (permalink)
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Is it possible to swap 2 ignition coils around and then check the fault code to see if the misfire has moved.
Just thinking out loud really.
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Old 12-21-2014, 04:00 PM   #3 (permalink)
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First, thanks for the response.... I'm sorry I neglected to state that we had tried that.

My brother and I are beating ourselves up over this, not finding the problem. It was a lot of work to get to the fuel bar and injectors and not to have a fix.

We did swap coils with several cylinders in an attempt to isolate the problem. Fault code is always No 6. As stated we also replace the # 6 plug with new. The plug that was in there only had 3000 miles on it, however at less than four dollars went for it!

I should also state that while running the engine, we removed the coil wire from cyl 1 to cyl 6 one at a time. All had a drop in performance on the engine, except 6, which tells me 6 is/was not work correctly.
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Old 12-21-2014, 04:40 PM   #4 (permalink)
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Sounds like it's not running on number 6 at all.
Wiring from ecu to coil ?
Compression test ?
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Old 12-21-2014, 07:24 PM   #5 (permalink)
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We have not ran a compression test. Was hoping not to do that.

Need to understand how to trace the wire back to the ECM, to check for continuity. Have yet to tackle that. I know how to check with Voltmeter, however not sure about the color coding and what part of the ECM it is in.

Keep your thoughts coming, it just re affirms what we are chasing.... Not what I want! LOL!
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Old 12-22-2014, 01:04 AM   #6 (permalink)
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I'd like to think it's not a compression problem as I don't know how the ECM would know.
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Old 12-22-2014, 05:38 PM   #7 (permalink)
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Confirmed - Cyl 6 LOW compression @ 75...... Just have to do a WET test and be done with the testing and off for a repair of the head.

Thanks for reading!
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Old 12-23-2014, 12:13 PM   #8 (permalink)
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Quote:
Originally Posted by cellmate140 View Post
Confirmed - Cyl 6 LOW compression @ 75...... Just have to do a WET test and be done with the testing and off for a repair of the head.

Thanks for reading!
let us know what you find.
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Old 01-04-2015, 08:46 PM   #9 (permalink)
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I traded in the vehicle so I don't know what the final outcome is on the engine. I didn't have the time to do the work along with the estimate of $2500 to do the engine work. Taking into consideration the book value of the vehicle, for me this was the best route to take.
Thanks for everyone trying to help! I love the forums!
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Old 08-19-2015, 12:54 AM   #10 (permalink)
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I am sorry to spread to you bad news but the bginning of an engine death on these veronas is a misfie issues in the cylinder then massive engine oil burning then finally engine blow I suggest get rid of this car before it dies because that what happened to me
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