P0307 Cylinder misfire code

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12-14-2009, 08:15 PM

#11

budders

4th Gear Member

Join Date: Jun 2009

Location: PA, Killadelphia

Posts: 1,373

mine was miss firing on 3, new coil pack fixed the issue.

12-14-2009, 09:31 PM

#12

naza

2nd Gear Member

Join Date: Aug 2009

Location: tn

Posts: 166

Quote:

Originally Posted by ct_white_stang

OP - Make sure you torque down the plugs correctly. Do yourself a favor and do a search on spark plug blowout on here...

That will be the first thing i check tomorrow! Im pretty sure i got it really tight, but you never know...thanks

Quote:

Originally Posted by budders

mine was miss firing on 3, new coil pack fixed the issue.

Yeah, if thats the problem i might as well do all 8..

12-15-2009, 12:08 AM

#13

Xemeth

5th Gear Member

Join Date: Jul 2006

Location: CT

Posts: 4,951

Quote:

Originally Posted by naza

That will be the first thing i check tomorrow! Im pretty sure i got it really tight, but you never know...thanks

Yeah, if thats the problem i might as well do all 8..

Don't just make the spark plugs really tight. You need to actually torque them to 14-16 ft/lbs. The heads only have 4 threads on them and improperly torqued (too little or too much) will blow them out.

Don't waste money replacing all the COP's. Take the #6 COP and swap it to another cylinder. If the misfire follows it, you know it's a bad COP. Just replace the bad one. No point in replacing 7 good COP's.

12-16-2009, 09:22 PM

#14

naza

2nd Gear Member

Join Date: Aug 2009

Location: tn

Posts: 166

Quote:

Originally Posted by Xemeth

got home late from work so i couldnt check it...... didt have a torque wrench so i have no clue how tight i did them haha...

well the car has 108k on her so i wasnt sure if it was time for a COP change but if its not worth it ill just replace the one that is bad...