I actually had this happen several times with my 03..

It was weird because I had never gotten a P0300 while cruising, I had gotten it on occasion with the ECU+ but the new firmware fixed that.

When I did get it, I noticed I heard a noise, turns out it was my downpipe clunking the tie bar. When I insulated it, it went away.

My point is, look for stuff that may have just loosened up and is clunking thats directly connected to the engine.

 

Yea Ill check around. Its funny to get this code after 50k I put on this beast. Oh well. Wish we could find a fix for it in the stock ECU. That person could sell that flash for alot of money


Find it Jack. Find it

 

I know if you are running a cat you don't want to run race gas but you can get some relatively high octane unleaded.

A log of regular gas knock voltage overlapped on a log of race gas knock voltage (same environment) might tell you if you have a mechanical knock or actual.
iow, the race gas map will still show mechanical noises but will likely not show the same engine knock as you have with regular weak gas.
by this method you should be able to "see" where you can disregard the ecu's knock sensor's worries.

You would want to remove your wideband o2 sensor for this test.

 

i use to have the same problem, everyday, day after day. It would come on and feel ike the car was mising so bad it was so annoying. THen i got a new clutch and an Ivey tune and it went away.

 

Hi Adam, this is another Adam. :-)

I too am once again throwing the dreaded P0300 code, even after flashing back to the latest 05 Evo Mitsu firmware available. I see that the ECU+ folks have released a supposed P0300 fix and am intrigued by Jack's ideas here, though I have to say, my car has been through about every conceivable fix for this including the Mitsu recommended reflashes, a piggyback, multiple new plugs and new gapping settings, and even a full transfer case rebuild, and it has come back. The only thing I haven't tried is new injectors and a completely new transmission, which has been suggested.

I am inclined to agree with Shep that there is absolutely a massive defect with the manner in which the drivelines of early 2003 Evo's at highway speeds and RPMs produce certain frequencies of sound that are so close to the knock sensor's "trigger sound" that it triggers constant false positive knock detection when there is actually no knock (misfire).

I also suspect that Mitsubishi knows this, and rather than recall every 2003 Evo and gut the engines to replace faulty knock sensors or rework the drivetrains, they chalk it up to bad firmware and deny, deny, deny.

That's my theory anyway.

And Jack! Long time no see, love to see you weighing in with your "Dr. ECU" ideas. At least, that's what you should be called :-).

Mike@ Atlantic -- hope you guys can help!

Cheers,
Adam

 

My car does exactly what Evo8dad and M2 described. I am looking foward to having my trans rebuilt as soon as I can find a car to drive for two weeks.

This sounds like Class-Action Lawsuit type stuff. A group of people did one against Apple for the 3rd Gen iPod and I ended up with a new battery after all was said n' done. Anything is possible. All we need is a decent lawyer and enough evidence to move forward.

 

I now enough high powered attorneys here in Philly but, is it really worth hassle and expenses? Also, a decision wouldn't be handed down and action wouldn't be taken by Mitsu until probably '08.

I guess what I'm saying is that I would need to hear from everyone on this forum and any other Evo related forum whether or not they are interested in participating in a possible action against Mitsu for this problem.

Maybe I should start a seperate thread on this issue?

 

Is there an out of pocket cost for class-action suits? I wouldn't think there would be since the Apple iPod case was all about battery life and you can have them replaced for $99. Who on earth would spend a ton of money if they could just bite the bullet and spend a C-note?

The hard part would be gathering all the data from everyone who's had this problem. You'd need to make sure you have this problem documented by every stage of modified Evo so that Mitsu can't claim that "X modification could cause this". With iPod it was easy to prove...play your iPod continuously till it shuts off. Battery didn't last as advertised.

 

To be completely honest with you I am not sure if there is a cost or not but, I have never met an attorney who works for free, regardless if they will see the money in the end.

 

To be completely honest, the only people who get anything out of a class action lawsuit is the lawyers. Typically they take on the expense for the lawsuit, and the participants in the class action get the "satisfaction" that had been negotiated to satisfy the judgement.

 

MJ is right. Although jusdgements that are handed typically benefit the plaintiffs. In this case it is possible, so long as a significant amount of transmissions can be documented to have this problem, that Mitsu will be forced to take action to rectify the problem.

Their counsels will undoubtley argue that Mitsu has taken action, however, it must be shown that their actions have yet to resolve the problem.

Again I am not sure it would be worth the hassle unless their are a significant amount of people that are willing to participate and can document their issues.