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Old 01-21-2020, 09:18 PM
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Throwing Code P0305 Misfire Cylinder5

I have a 2014 3.6L Automatic We have swapped out coil and eliminated that as the issue. Put 6 brand new Bosch injectors and this only temporarily fixed the issue. Now it is misfiring again not even a day later. There is no shaking or rough idling. It seems to be only at start up them seems to disappear. Any ideas what this could be? I haven't driven it since I don't want to cause a bigger issue not knowing why it is doing this. Thanks so much for your help!

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Old 01-21-2020, 09:26 PM   #2
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Is it really a misfire or is it just throwing the code? If it gives the CEL and runs as normal then it probably okay but maybe get it checked out.

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Old 01-21-2020, 09:32 PM
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If you cycle the key there is no code stored but if use a snap on scanner the code appears three times misfire, misfire and then permanent misfire. We can hear it as well at start up but no rough idle or shake.
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Old 01-21-2020, 09:33 PM   #4
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Old 01-21-2020, 09:52 PM   #5
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You didn't mention checking the spark plugs? Have you removed plug from cylinder 5 to look for any issues with the plug (fouling, broken electrode, etc)
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Old 01-21-2020, 10:02 PM
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Yes we replaced all spark plugs and actually cylinder 5 plug did not look that bad, a little darker then others but not terrible. Cylinder 5 is on Drivers Side of Motor closest to the fire wall just to confirm right? Saw a few diagrams tonight that showed different.
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Old 01-23-2020, 10:05 AM   #7
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Bad coil perhaps?
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Old 01-23-2020, 02:01 PM   #8
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Quote:
Originally Posted by jhjbsmith View Post
Yes we replaced all spark plugs and actually cylinder 5 plug did not look that bad, a little darker then others but not terrible. Cylinder 5 is on Drivers Side of Motor closest to the fire wall just to confirm right? Saw a few diagrams tonight that showed different.
Negative, pass side
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Old 01-23-2020, 02:18 PM   #9
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Per the MOPAR service manual:

The cylinders are numbered from front to rear. The right bank is numbered 1, 3, 5 and the left bank is numbered 2, 4, 6.

So cylinder 5 is right (passenger) rearmost cylinder.
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Old 01-23-2020, 02:19 PM   #10
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I have a P0306 on my Jeep and hooked up a OBD2 tool to graph RPM on my iphone. I then sprayed carb/chock cleaner where the head and it intake manifold meet and found that my RPMs varied when I sprayed near #6. I have a new mopar gasket and am getting ready to tackle the job. I had to be underneath the jeep to spray on the underside of the intake manifold. It is a test that only runs about $3.


Un, wrong forum... this was on my TJ... ha ha... I don't think the 3.6 will have the same issue as the 4.0L.
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Old 01-23-2020, 04:55 PM   #11
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I have a P0306 on my Jeep and hooked up a OBD2 tool to graph RPM on my iphone. I then sprayed carb/chock cleaner where the head and it intake manifold meet and found that my RPMs varied when I sprayed near #6. I have a new mopar gasket and am getting ready to tackle the job. I had to be underneath the jeep to spray on the underside of the intake manifold. It is a test that only runs about $3.


Un, wrong forum... this was on my TJ... ha ha... I don't think the 3.6 will have the same issue as the 4.0L.
LOL not so easy to reach where the intake meets the head on a 3.6 Pentastar!
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Old 01-24-2020, 10:45 AM   #12
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Watch the first couple minutes of this RE: spark plug coils


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