P0307 Cylinder 7 Misfire Detected!! - Mustang Evolution

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Old 12-08-2015, 09:38 AM   #1
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P0307 Cylinder 7 Misfire Detected!!

i had these problem now for couple of days trying to find out whats wrong after i installed boss 302 manifold, i try to clear it using my tuner but after of couple miles i drove the light will come back again. any idea what could be the problem is? Click image for larger version

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Old 12-08-2015, 09:46 AM   #2
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It's a reach but, I'd say...it's a cylinder 7 misfire.

Seriously, you can switch the coil on plug with the one on another cylinder, clear the code and see if the problem follows the COP. Still happening on 7? pull that plug and inspect it closely. Replace it anyway and see if the problem goes away.
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Old 12-08-2015, 09:48 AM   #3
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It's a reach but, I'd say...it's a cylinder 7 misfire.

Seriously, you can switch the coil on plug with the one on another cylinder, clear the code and see if the problem follows the COP. Still happening on 7? pull that plug and inspect it closely. Replace it anyway and see if the problem goes away.

Not a bad idea to run a compression check if you have the tools.
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Old 12-08-2015, 10:28 AM   #4
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this morning the engine just shuts off while on park. it could be spark plugs?


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Old 12-08-2015, 10:35 AM   #5
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Not very likely. spark plugs tend to show as high rpm or load misfires. What are your mods/tune? Does the car restart after shutting off?

Do you have the tech package on your car? If so, you can check the codes on the car by holding down buttons 3 and 6 on the radio display with the ignition on. Follow the prompts from there to view DTCs.
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Old 12-08-2015, 10:51 AM   #6
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i got boss 302 manifold, cai, OR/X, Roush A/B and bama tune. this happened after me and my buddy install the boss mani in my garage.


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Old 12-08-2015, 12:01 PM   #7
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In that case, you need to go back through and carefully inspect all of the work that you guys did when installing the intake manifold. There is probably an electrical connector, or vacuum hose, that did not get connected properly.
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Old 12-08-2015, 12:38 PM   #8
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Quote:
Originally Posted by mhel View Post
i had these problem now for couple of days trying to find out whats wrong after i installed boss 302 manifold, i try to clear it using my tuner but after of couple miles i drove the light will come back again. any idea what could be the problem is? Attachment 194539


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I got the same code and it was my #7 cylinder coil. I have aftermarket coils and they are guarenteed for life. Had it happen twice now but the last replacement coil seems to have solved the problem.
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Old 12-08-2015, 01:25 PM   #9
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all the above is good advice. Is your car tuned for the Boss manifold? You can't just slap it on.
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Old 12-08-2015, 01:40 PM   #10
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all the above is good advice. Is your car tuned for the Boss manifold? You can't just slap it on.

yeah i had bama tune on it. so if the coil pack was bad i dont need to replace all of them, im not sure if they sell it by piece?


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Old 12-08-2015, 02:26 PM   #11
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IF it is the coil pack, I think you can buy them individually from Ford. Won't be cheap but, what is? You can buy them in the aftermarket from Sultans of Spark for about $40 each.
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Old 12-08-2015, 02:43 PM   #12
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And Rockauto has Motorcraft COP's for about $45 apiece.
There may be a 5% discount code in the General Mustang forum... If it is still valid and hasn't expired yet.
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Old 12-09-2015, 05:59 PM   #13
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problem solved injector ring was missed on 7 thanks guys.


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