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Old 12-11-2012, 06:53 PM   #1 (permalink)
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Default Cylinder 3 misfire new plugs new wires?!

Hello everyone im new here and i was hoping anyone could help me figure out a little issue im having with my car. i have an 03 mazda 6 2.3 4cyl and just the other day it started to chug and shake whenever i accelerated and my check engine light came on so i pulled codes and only code was p0303 cyl 3 misfire so i decided to do a tuneup on it since it was time for it anyway but after installing new plugs and wires my car was still running rough and i still had that same code come back after i erased it. does anyone have any ideas to what it could be help will be greatly appreciated. p.s. i checked to see if i was getting spark on #3 plug with a plug adapter and i am.
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Old 12-11-2012, 06:59 PM   #2 (permalink)
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You gapped the plugs before install correct? Did you replace the ignition coils as well?

Maybe try cleaning you MAF as that will cause rough running/shuddering when they are dirty and not functioning properly.


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Old 12-11-2012, 07:05 PM   #3 (permalink)
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Yes i gapped the plugs to .050 and thanks i will do that asap to see if it helps. thanks for replying.
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Old 12-11-2012, 07:13 PM   #4 (permalink)
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Did you replace the ignition coils? Is that what you meant by wires? You may have a bad ignition coil.

Another thing you can try is taking the cylinder 3 coil and moving it to another spark plug to see if follows. If it does you surely have a bad ignition coil.


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Old 12-11-2012, 07:38 PM   #5 (permalink)
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well maybe ur car has coils but this is the 2.3l has wires not coil on plug and they all get spark from one single coil with 4 posts. like in the pic.
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Old 12-11-2012, 07:56 PM   #6 (permalink)
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Ahhhh gotchya.

Maybe that main block (w/e its called) isnt functioning properly. Not familiar with the 2.3 really man. Just tryin to help out with ideas ya know. I figured it would have coil over plug like the V6.


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Old 12-11-2012, 09:58 PM   #7 (permalink)
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yup thanks anyways im going to further test the coil
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