Hey guys! Let me give you a little background to what I've exprienced. For the last 10,000 miles I've been experiencing terrible misfire b/w 3-5K rpms in 5th gear. The misfire would be so bad that the engine would stutter until I got off the throttle. It typically occured b/w 70-80 mph...right where I do 90% of my driving. It would occur at least 10x a day. I didnt want to bring it to mitsu b/c thier "reflash fix" seems to work for only some people, and whats worse is that it will lock you out from doing any other reflashes in the future. I changed the plugs and that seems to clear it up of a little while, but the stuttering returned.

Then I saw a post from shiv and how he uses a $40 Creader to clear up the problem.

He recommended that I leave the Creader plugged in all the time. I've been driving like this for 6K miles and NO MORE STUTTERING! I cant believe the difference! I was about to blow 2K on the AEM EMS b/c the misfires were driving me crazy! BTW, I am in no way affiliated to Creader and neither is Shiv. I bought mine off of ebay. I will report in another 10K miles as to weather this continues working!


Bobby

 

Strange, I had a P0300 misfire problem with my 04 RS and never had a driveability issue. The light would just come on in fifth gear about 3k rpm under slight load conditions. You may have a problem that can be fixed. A bad PCM or maybe the program needs to be re-flashed. I was told that the problem is usually the gears in the transmission pulling apart when the trans case expands, due to the expansion of the case when heated up. This resulted in residual noise the the PCM logged as a missfire condition. So Mitsubishi tightened up the specs on the Trans. That is why usually a trans replacement will cure the P0300 problem.

In your case the problem sounds electrical, maybe a bad coil pack or bad sensor. You actually have a missfire. My car ran perfectly but the light came on.

 

Update: The Creader does work! When I disconnect it, the stuttering comes back. I havent had one case of misfire when I had the Creader plugged in!

 

ive thought about buying the creader, i just hate taking the obdII out of the loop.

 

Wow this is amazingly coincidental considering my situation (also contemplating the aem ems).

zmeli, I think it gets down to a wear issue. Depending on the wear of those gears (or whatever in the tranny is causing this problem) the misfire may or may not constitute real knock control on behalf of the ECU. I have had both conditions: just get a CEL, or get a stutter until I release the throttle. It's happened in all gears for me, always under steady or increasing load. It's quite freaky when it happens in 2nd @ 6k rpms, to say the least.

Hwang, do you have a link to this creader product? This is the first I've heard of it.

edit: _not_ ironic

 

Do a search, this is a known problem with the 03 Evo that many of us have either had trannies replaced or returned our vehicles under lemon laws.
Leaving the Creader in is the dumbest thing I ever heard. Almost as dumb, was Mitsubishi replacing my transmission to fix the problem only to come out with a code update a month later. The issue is that the knock sensor is too sensitive and is retarding timing when it detects vibes at those speeds. If you take it back to Mitsu they will fix it.
Also, do a search you will find a plethora of information on this.

 

Dude what is up!!

I'ma PM you in a bit...

 

Dud, what's up with you? Didn't they buy your car back because of this? Does anyone use the search feature anymore.

By the way the creader is an OBDII compliant code reader/resetter it is available on eBay for about $40-$50, I have one and it works great for reading and resetting codes. It is NOT made to be plugged in all the time. This will give you no codes and possibly allow serious damage to the car if you miss a real code.

 

Hey man, no I didn't, in fact I'll have more details about that soon but suffice it to say it's finally all over. And yes I'm still misfiring.

edit: edited because you remembered me.

 

I HAVE done a search

1) I have over 80K on the clock, Mitsu WILL not do anything for me.
2) My TC and tranny are FINE as evidenced by my high mileage.
3) The code IS NOT a fool proof method of getting rid of the p0300
4) The Creader is only a $40 investment.
5) If it is such a dumb idea, then why does vishnu do this?
6) The Creader does allow other MAJOR codes to come through.

 

"The CReader seems to interfer with the test PO300 test cycle. It does not constantly "reset" the ECU. If the test cycle never completes, the code wont be thrown. Fortunately, primary codes are still functional so your OBD2 system is still useful as ever. Resetting the ECU doesn't really have any benefits. It does, however result in a the car running the conservative fuel and timing maps for the first several seconds of on-boost driving.

Shiv"

This is a quote from a thread in the vishnu forums

 

http://cgi.ebay.com/ebaymotors/ws/eB...spagename=WDVW

 

OK here is my story

I purchased a used 2003 evo with 21,000 miles on the clock
mods are
cat back exhaust
hks intake
perrin cat delete pipe

the car drives fine until I take it on the highway 5th gear above 3000 and bam misfire and CEL

this freaks me out because it sound like a massive lean condition

I take car to dealer and they tell me it is because the exhause and intake and the exhaust
has no back pressure LOL it's a turbo the turbin creates back pressure.

anyway I take it to a local tuner and leave the car for 5 days, he tried everything he could and then called the mitsubishi service rep and asked him what it might be and the rep tells him I need to have the ecu flashed by the dealer, he also said it is a fuel starvation problem
or a vapor lock issue, the ecu isn't telling the fuel pump to pump enough fuel which is causing a lean condition which causes the engine to misfire and triger the cel.

I tried the creader fix but it did nothing for me.

the dealer also replaced all four callipers because clear coat was pealing off. when I got the car back and drove out of the parking lot the brake pedal went to the floor so I stopped and checked to see if the master cylinder had any fluid and noticed that the cap was next the the windshield wippers.

f----- scary techs working on our cars.

 

http://search.ebay.com/creader_W0QQfkrZ1QQfromZR8


try this creader and let us know

 

I was talking with a friend of mine who used to be a crew chief on a lemans endurance team and he said they had a problem with transmission harmonics in there porsche.

he said they put in some really high end transmission lube and it took care of the problem

he said it was some kind of molly lube but didn't remember the name but he suggested that I try some red line multi viscosity lube

has anyone tried this