I was drving on the freeway and my cel went on and engine became weak and very rough. I scanned the code and it is P0303( cyl 3 misfire). I changed my spark plugs about 5k miles ago so I don't think they are bad. The car has 90k miles on it. Any reason why this would happen? Or any known issues at 90k miles like coils going out? Any input would help me out a lot. Thanks guys.

 

bump

 

Coil pack possibly.I would remove it,inspect it,add some dielectric grease to the tip of the sparkplug and check coilpack connections,re-install and see if it comes back.

 

anyone know which is cylinder 3?

 

Alright, I found out that cyl 3 is passenger side close to firewall(thx Gino) so I took out the spark plug and swapped it with cyl 1 to see if the cel would go on (p0301) but it still said P0303 so It isn't the spark plug. Anyone know if I can swap the coil off of a different cylinder to check it or are the different?

 

Ok, I fixed it, it was the coilpack. Went to the dealer and droped $127.00 for a new 1 and took about 5 min to replace the old 1, works like new now thx Donkey

 

Sweet!Glad that was the problem!

 

hijacking thread even though u already solved the problem.... right now i have a CEL and its p0303 .. misfire of cyl #3. im txs stg2 and my friend said to reset the ecu first, its an 05 wrx with a lil over 10k on the odometer. is it ok to drive the car normal or should i not be boosting at all?? ive read what to replace, but its a brand new car and i dont exactly how to take everything out that needs to be replaced

 

the same thing happened to my 04 wrx. since it was still under warranty, i took it to the dealer and they shipped the ecu out to soa to be reprogrammed. drove a renter for a few days.