Engine Missfire Codes P0300, p0302

[Silver550]

My engine light recently came on and I checked it and I got a p0300 along with a p0302, missfire in cylinder #2. I switched the car stock completly and took it to my nearest dealer. They drove the car and noticed no issues. They returned the car and a day later on my way home the light came back. I took it back and they checked the plugs and the coils and cleared the code, once again it came back. The third time they called ford and Ford had them update my pcm software. I picked up my car and again a day later the code came back. I have been doing some research and I found this thread on all ford mustangs, it talks about 2011-2014 CEL P0300 Engine Misfire Ford TSB 13-6-15 Crank O ring Installation. On monday I am going to go back to the dealership and ask about this.

Here is the link: http://www.allfordmustangs.com/foru...rd-tsb-13-6-15-crank-o-ring-installation.html

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[SD_GT]

Which dealership you going to? PM Deysha on here [MENTION=7992]FordService[/MENTION] with your info and problem you're experiencing.

 

[Silver550]

I've been going to the Penske dealership in La Mesa.

 

[Silver550]

So, here is an update. I looked into the Ford TSB 13-6-15 and it consists of placing an O-ring on a CKP sensor and clearing the code. I have contacted my local Ford service agent and I am going to drop my car off tomo. Here is a pdf link for the TSB:
https://latemodel.cachefly.net/downloads/tsb05-14/tsb13-06-15.pdf

 

[Silver550]

I just dropped my car off at the dealer and they are going to look into the TSB 13-6-15

 

[FordService]

Which dealership you going to? PM Deysha on here [MENTION=7992]FordService[/MENTION] with your info and problem you're experiencing.

Thank you for the mention, SD_GT!

I just dropped my car off at the dealer and they are going to look into the TSB 13-6-15

Be sure to stay in contact with your CSM until this has been addressed for you, Silver550.

Deysha

 

[Silver550]

Update, It has been a week and they still have not figured out the problem. They have switched the injectors, plugs and removed the valve cover. They told me that the TSB did not pertain to my car because it is not for my model year. So, I have been car less for a week and I asked for a rental and they said that Ford corporate will most likely not approve of a rental until they start repairing something. I have to be car less until they figure out what is wrong with my car? What the heck, this sucks.

 

[alimustafa23]

Update, It has been a week and they still have not figured out the problem. They have switched the injectors, plugs and removed the valve cover. They told me that the TSB did not pertain to my car because it is not for my model year. So, I have been car less for a week and I asked for a rental and they said that Ford corporate will most likely not approve of a rental until they start repairing something. I have to be car less until they figure out what is wrong with my car? What the heck, this sucks.

Ah man. I totally feel you. I can't even take mine in for diagnosis with the same exact misfiring issue, as the dealer said he doesn't have any loaners at the moment..There is a wait list for that as well. :tsk::tsk: This is my only ride and it sucks big time :(

Let me know what they find out regarding your car. All the best!

 

[Silver5.0]

I too, have been having cylinder misfire issues (P0308 and P0300) with my car. The dealer had it for nearly 10 business days in total. They worked with the Ford Engineering Hotline and performed all kinds of tests which resulted in nothing being fixed. The last thing they did was de-carbon the engine. Also, when the issue first appeared, they replaced a coil pack and spark plug on cylinder 8.

A few questions for you. Does your CEL come on steady or flash? Mine comes on steady. Did the technicians ever tell you that your car is retarding the timing? Does your car backfire often?

 

[Silver550]

I too, have been having cylinder misfire issues (P0308 and P0300) with my car. The dealer had it for nearly 10 business days in total. They worked with the Ford Engineering Hotline and performed all kinds of tests which resulted in nothing being fixed. The last thing they did was de-carbon the engine. Also, when the issue first appeared, they replaced a coil pack and spark plug on cylinder 8.

A few questions for you. Does your CEL come on steady or flash? Mine comes on steady. Did the technicians ever tell you that your car is retarding the timing? Does your car backfire often?

I noticed the backfiring first. It's not a crazy backfire, but I definitely noticed. I did not notice any other symptoms. The techs never mentioned anything about timing.

 

[Tommy V]

Does it miss only under light acceleration,or under light and heavy acceleration?

 

[Silver550]

It backfires under light acceleration.

 

[WindyCityStang]

My 2017 was misfiring cylinder 6 and I was just informed today it is a broken valve spring. They are having it replaced and I should get the car back by Friday. Idk if your dealer has looked into that or not but it seems like that was the issue with my car at least :/

 

[Silver5.0]

In this thread, http://www.mustang6g.com/forums/showthread.php?t=61360, Slater 5.0 had a cam phaser replaced which seemed to do the trick. I wonder if that's the problem with mine. I'm really not looking forward to taking it back to the dealer but I have to get this fixed.

 

[Tommy V]

It backfires under light acceleration.

Thats what mine is doing and missing at light accel,my problem was the right side imrc plate was stuck open,only difference was mine had the misfire code and the imrc code.

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