CEL with a P0308 code - bad coil pack and spark plug

[Silver5.0]

Last Thursday, after I started my car (GT/PP with 22,000 miles) to leave from work, the CEL came on. The engine sounded fine and power seemed to be the same. I took it to the dealership the next day and they found a P0308 code (cylinder #8 misfire more than 100 times). So, the replaced the coil pack and the spark plug. Cool, that took care of that... until yesterday.

Once again, I left from work and at the approach of the first stop light, I down shifted a couple times and as I was almost stopped, (transmission in neutral), the car stalled and the start button light was flashing. After starting it, the CEL was back on again. WTF!

Now, full disclosure here - I honestly can't remember if I just forgot to take it out of gear when I was almost stopped and then it stalled or I popped it in to neutral as I always do, and then it stalled. But it happened so smoothly and the car didn't sputter or anything, it just quietly died.

So, I'm going back to the dealership Saturday to find out what's up. Anyone else having similar issues?

One more thing... The service manager said that TSB's are no good after 12,000 miles. Is there any truth in that?

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[S550 KID]

Same thing happened to me at 23k miles. It's still happening. Got p0300 and p0308 codes, checked my iridium plugs they are fine and switched the coils around. I've been Procharged since Feb 15 and the car is my daily and this randomly started up out of nowhere. I don't even have the time to take it in because I need the car to drive everyday to work etc. I have an sct x4 and just clear the codes when they pop up lol

 

[Silver5.0]

So a P0308 code is misfiring on cylinder 8. Not sure what 0300 is. I've never had a car that had issues with misfires. Is it something I would hear? I'm thinking the car might feel a little less powerful but I don't really know.

 

[GMB Racing]

p0300 is random misfire code , sounds like the tune could use some fine tuning

 

[S550 KID]

Even though it ran fine on this tune for over a year? It needs fine tuning? That doesn't make sense

 

[SmokedSS]

It could be a tank of bad gas or you may try "crank re-learn". That worked for me but I am not on stock tune.

 

[Driversound]

Last Thursday, after I started my car (GT/PP with 22,000 miles) to leave from work, the CEL came on. The engine sounded fine and power seemed to be the same. I took it to the dealership the next day and they found a P0308 code (cylinder #8 misfire more than 100 times). So, the replaced the coil pack and the spark plug. Cool, that took care of that... until yesterday.

Once again, I left from work and at the approach of the first stop light, I down shifted a couple times and as I was almost stopped, (transmission in neutral), the car stalled and the start button light was flashing. After starting it, the CEL was back on again. WTF!

Now, full disclosure here - I honestly can't remember if I just forgot to take it out of gear when I was almost stopped and then it stalled or I popped it in to neutral as I always do, and then it stalled. But it happened so smoothly and the car didn't sputter or anything, it just quietly died.

So, I'm going back to the dealership Saturday to find out what's up. Anyone else having similar issues?

One more thing... The service manager said that TSB's are no good after 12,000 miles. Is there any truth in that?

Engine stalling is another issue and most likely occur when slowing to a stop with the clutched depressed. You might want to read the thread here
http://www.mustang6g.com/forums/showthread.php?t=17972

 

[alimustafa23]

http://www.mustang6g.com/forums/showthread.php?t=59144

Same issue for me

 

[Silver550]

Check out TSB 13-6-15: https://latemodel.cachefly.net/downloads/tsb05-14/tsb13-06-15.pdf

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