2003 Mitsubishi Lancer Evolution: misfire or rough idle

Filed Mar 28, 2007 · Electrical · 16,000 miles · CA

My vehicle had repeatedly shown a check engine light for a misfire code. Every time I get the check engine light,the car vibrates and loses at least 45% power. I feel that the car is very unsafe to drive. I have brought the car for diagnosis 7 plus times. Hell, they even rebuilt the engine in an attempt to fix the problem! That obviously did not cure the problem. Now I am out of warranty.

Filed Jun 23, 2006 · Engine · 7,019 miles · CA

P0300 multi-cylinder random misfire. After many attempts made my mitsubishi, this problem has never been fixed. On average, this happens 3-4 times daily, everyday and hinders driveability. Mitsubishi has issued parts to be warranted and has denied all responsibility. Mitsubishi has quoted that the ses (check engine light) in no way, when illuminated, affects driveability, value, mechanical functions of the vehicle. Therefore, in short, they are claiming that the light is just for show. I have written proof from mitsubishi with that statement denying all claims and not taking any responsibility.

Filed Jan 14, 2005 · Engine · 17,000 miles · VA

Chronic p0300 random misfire in 5th gear under partial throttle. Build date of vehicle is feb 03.

Filed Jan 7, 2005 · Engine · 15,000 miles · IL

P0300, random misfire code. Mitsubishi dealers claim no record of issue and no fix. Continuous and repeatable situations.

Filed Jan 7, 2005 · Engine · 15,000 miles · IL

P0300, random misfire code. Mitsubishi dealers claim no record of issue and no fix. Continuous and repeatable situations.

Filed Jul 1, 2004 · Transmission · 13,000 miles · CA

Ecu registers p0300 (multiple cylinder misfire) obdii error code. Error code is thrown, ses light comes on, and car stumbles until throttle is released. This typically occurs at light throttle or cruising (steady) throttle. It can occur under load (acceleration) but never occurs on deceleration. Known facets of this problem thus far are: 1) mitsubishi is aware of 2 issues: sticky (dirty) injectors and a transmission harmonic resonance, which throws the knock sensor 2) the car is undriveable when this occurs until the throttle is released. 3) my vehicle in particular is almost 100% undriveable on the highway due to this problem recurring every 10-15 seconds during any sort of highway driving period. 4) it _is_ a safety issue as I have had this occur under light acceleration attempting to merge into traffic, only to be met with what feels like a wall when the error code is thrown and the ecu retards the timing because it is detecting knock (which is not actually occurring). 5) mitsubishi (mmna) is apparently aware of an ecu reflash fix for this problem (the harmonic resonance issue, not the injector issue). They have claimed that the flash will be out "within 3-6 weeks" since november 2003, and it is still not out nor available. I have been told it is held up in epa certification. This problem has occurred for me literally hundreds of times, and no dealership has been able to fix it because mitsubishi will not authorize any warranty work on my vehicle for this problem, citing that "a fix is already on the way, wait for it."

Filed Jun 22, 2004 · Electrical, Engine · 19,000 miles · CA

1. This car is completely stock and driven by an adult who does not race or abuse any of the cars mechanical systems. 2. The issue I have is with a obd-ii 'engine warning' code cell 0300 I repeatedly get while driving on the freeway. I experience this warning up to 5 times a day during my 20 mile freeway commute. The cel warning comes on most often during very light acceleration inputs (5-15% throttle) while attempting to maintain speed with the other traffic on the road. While gently touching the throttle, there is a sudden and violent engine misfiring that slows the car down considerably. This makes me a safety hazard on the streets because the car will not accelerate again until I let off the throttle completely then jab it violently (50% or more throttle). This error repeats each time I use gentle throttle inputs on the freeway. As a result, I drive around with my "check engine" light lit almost 100% of the time. In the state of ca, if your engine light is on when you go for your annual smog/emissions test, you are instantly failed! My car would fail an emissions test in this state because the equipment is not operating properly. 3. I approached the dealer with this issue. They replaced the coil packs and the spark plugs to see if that would fix things. And while they were very cordial about finding the source of the problem, and fixing it under warranty, they were not able to fix my car. They also don't know what is causing the ecu to throw this error code. So I am currently driving a 1 year old car that is still shuddering violently at highway speeds, creating a rolling roadblock when shuddering, and is an instant fail when it comes time to do a smog check. This problem obviously effects the safety of my vehicle and the resale value of my vehicle and needs to addressed right away.