Subaru WRX Forum banner
1 - 6 of 6 Posts

·
Registered
Joined
·
4 Posts
Discussion Starter · #1 ·
Hi. Anyone help with this issue? Car has real rough warm up after not being started for 8 hours. Been to Subaru 3 times but they don't know what the issue is. Starts up and then runs rough for 20 seconds, popping, farting and so on then sometimes an air noise from the engine bay on the drivers side and then the check engine light with code PO300. It starts rough every time but code only shows every 3 or 4 days.
Subaru updated the computer firmware about 3 times, changed the air cleaner and sent me on my way.
Any ideas or experiences?
 

·
Super Moderator
Joined
·
11,417 Posts
I believe that is a misfire code. If you hear air check for boost or intake leaks.
 

·
Water.....sometimes waves
Joined
·
1,612 Posts
The 'every 3 or 4 day' thing is normal. Depending on the code, it can take several "drive cycles" to set a code or to turn one off. As for your problem, it is as XJ says - could be many things; diagnose.
 
1 - 6 of 6 Posts
Top