I don`t want to set off any alarms nor give false hope to thers with a ix. I have been having this misfire problem for some time now.After making my third trip to the dealership and contacting mitsubishi headquaters, the dealer called me today and said they found the cause of my p0300 problem.They said it was a faulty mass air.Now i am going to pick my car up tomorrow so i will let you guys know if that was the fix.The service manager told me that my old mass threw the code every time he tapped it and their testing equipment could not find the source of the misfire. So,to the guys with this code issue give your dealers a tip of what to check if they are having the same issue ,providing my issue goes away with this new mass air sensor.

 

keep this thread updated, there are quite a few of us in the NW with this problem (0300).

 

I will.Aparently mitsubishi is aware of this problem and told me they are seing alot of evos in the NE having the same issue.At first they tried to tell me i had a contaminated fuel system.Well 6 tanks of fuel later from different gas stations i still had the issue.

 

Well i pucked up the car from the dealership this morning and drove it all day.So far no issues. I am keeping my fingers crossed. I will post another update by the weekend.

 

One of the local guys here noticed that his issue was compounded by advanced timing, but even going back to a stock map it would set the SES every couple of weeks. Mine is on more or less all the time.

 

Well the light came on tonight. I am going to call the dealer on monday again.And you are ok with the light on?

 

My car is bone stock

 

I assumed that the minute the misfires started occuring, the CEL came on? Did you attach an OBDII reader to determine that it was in fact a PO300 code?

Reason I ask is ever since I bought my IX MR, I notice that my idle is a bit rough at times.. similar to a cam lope shudder, or a tiny misfire. No CEL though, and no codes or freeze frame data caught by my scanner...

 

i am going to check the code tomorrow .I was too pissed to ckeck it.The idle was very lumpy just before the light came on. Also i bought gas like 5 min before this happened

 

Where in New York are you... if you're close, maybe I can help over the weekend.

 

I live in the bronx