Hello boys.... This is nutnbutturbo4's fiance. Well I can honestly say that Mitsubishi is full of $H$T. I took our car into the dealorship today....waited nearly two hours for the service forman and the mechanic to tell me..."the reason why your check engine light keeps turning on is because you are running too high of fuel, such as racing fuel". I just about fell to the ground laughing. I know... as well as you might know... of many owners of an Evo 8 that spend lots of money a week to run 101 octane and have not had the check engine light appear. They told me that they have a post about why this is happening and why they have to reprogram the pcm..... BULL $H$T. Not only was I offended by the comment about the racing fuel... I then decided to ask "what fuel should I run then?" they said " reg. unleaded"... I then walked to my car, pulled out my owners manual and began to read them the sentence out of it that stated on page 1-2 " Your vehicle is DESIGNED to operate on premium unleaded gasoline having a MINIMUM OCTANE OF 98" Not only have I personly not put 101 octane in our car, but have always put in 91 octane but the one time that I accidently put 89 octane our car had detination. They asked me if I put a octane boost in the car and I told them that even if my fiance had put some in at one time it would not even add up to the factory recommendation of 98 octane. By this time I was getting un easy because I was thinking that this forman and the mechanic were giving me a line of $H$T and I gave them the ok to work on our car. So I let them know before I left that when the engine light does come back on I will be giving them a call. So I was wondering if anyone knows where or if we can find this so called "post" they were talking about. Whats also funny about all of this is they put on my statement that our car had an cold air intake (which is just a nice looking air filter)and a turbo timer (which is our boost controller). Man the idiots some places hire. Let us know if anyone has any info on the so called "post"

 

You know, when I took my car in for the P0300 code the first thing the service manager asked me was "have you been using any type of racing fuel or octane booster?"

Good ol' Mitsu, once again trying to blame their problems on someone else.

 

I think this may be true to some Evos. A friend of mine put a bottle of Redline fuel cleaner and his CEL went on. I am not not if it was a P0300 code because as far as I know if you have the P0300 code and you reset the ECU via disconnecting the battery cable that the CEL would still be on. But on his, the CEL light went out and never came back. Go figure? Oh BTW it is true that if you have a flash already(dynoflash,works or vishnu) it will overwrite those maps.

 

My fiance put a half of tank of 101 octane and the light did not appear... I believe the Evolution 8 is a high performance vehicle... Anyone who knows sqaut about high performance vehicles, should know that you will get better performance out of your vehicle if you put a high octane fuel in your car. The thing that rubbed me the wrong way when I took it in this morning is they told me to run 89 octane. Do they not read their own manuals? Do they not have packet that they need to read before they attempt to tell the owners what octane to run or something they give to the mechanics when the car comes out to let them get to know the car before they work on it or give advise? When our clutch went out we called Mitsubishi and they told us the drive train was not covered in the warrenty...ok I can deal with that... yet when we asked them if they can put our clutch in...not only did they say it would cost us $900 in labor but they have only done once before and it took them two days to complete. Thank God there are shops out there who like to perform the $H$T out of high performance cars and know how to replace the clutch in a matter of hours. Road Race knew what they were doing and did a awesome job in putting in our new clutch and it was only $500... Mitsubishi as far as I am concerned can shick it up their A$$ if they think they are going to convience me that our gas is causing the problem. Yeah blamming it on someone else and not taking responsibility.

 

The P0300 appears to be totally random. Some guys are getting it with fuel additives and high octane, others are not. This thread with poll has the P0300 occurring more on EVOs that did not use high octane or octane boosters. https://www.evolutionm.net/forums/sh...ad.php?t=81925

I blame bad gas for my p0300. I have a through-the-mail Dynoflash and did not get the P0300 until after I had put about 4000 miles on my car. Al was going to look into the p0300 and what affects, if any, the flash fix would have on an ECU that had been Dynoflashed. https://www.evolutionm.net/forums/sh...ad.php?t=89007

For now, I am leaving my car as-is. I have not had the p0300 in about 1,000 miles.

You should open the EVO gas door and show them the sticker that clearly says "Premium...Only."

 

I think you're right. Specifically I think the loud low fequency noise disrupts the MAF or the MAF's ability to sense the vortices as they pass by the sensor. No vortices, no air or so the ECU thinks, so engine goes dead.

I bet the guys with this problem are running open element air filters and/or intakes.

 

Please feel free to PM me if you want more info regarding how my experience went. I'd rather not talk about it on the public forum yet.

SC~

 

Hey all-

Just had the reflash done. Took appx. 15 mins. I went yesterday and the process failed at 90%, so I had to go back today to get it done again. 30 miles later down the highway at all kinds of speeds from 5-90mph in every gear, I have no p0300 gremlins yet. Still waiting for the true test of time, but for now, I am pleased because normally I would have had a 'misfire' about 10x on the way back.

W0rd.

 

i still cant get my question answered, does it plug into data port? if not how is it done? will it see that an emange is changing signals?

 

Yes it plugs into the data port under the dash. No clue about the emanage, but it matters not since this is a vehicle-wide TSB.

 

Secret Chimp,

I did a reflash but the P0300 code came back after 1 day of driving. I checked the receipt, it actually said TSB 0413007 being perform. Is it the same as the billing code 13850113 that you have?

 

Welp, 90 miles after the reflash I threw the p0300 again. Just got off the phone with Will @ Veracom Mitsu and he wants me to bring the car back so they can run the full gamut of diagnostics on the thing (waste of time I know, but I have to start here). He is contacting the district rep to see if there is any additional info on this, and has a guy (George) who is apparently well-versed in the workings of the Evo who will be checking out my car. He's looking into a rental reimbursement for me right now so hopefully I can get the car in tomorrow.

I am pissed.

 

It will. I just had mine reflashed today. XFlash = gone.
Shiv will look into the dealer's reflash tom. I'll PM you tom on his "findings."

 

I am bringing my car back at 7:30am tomorrow morning to Veracom so they can run these supposed diagnostics. I got a rental and I contacted MMNA to get this on my record with them. The DR is supposed to give me a call this week sometime I guess.

I am at the point now where I want a new car, because this is obviously not going to get resolved.

 

I had a P0300 problem (lots of them, confirmed) but no CEL ... the dealership reflashed, well tried to, and something went horribly wrong. I have a new ECU, and it would appear as if several other components connected to to the ECU have been replaced as well. My car is now idling better than it has since I got it (March 03) and acceleration is significantly smoother, no stutter in 3rd between 3500 and 4000 any more.

Don't know if I had the same problem originally, but the new ECU seems to have fixed whatever was causing it ....