Question about 2004 Mitsubishi Lancer Evolution

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Random Misfire The service engine light is on and it throughs a random misfire code. Spark Plugs have been changed, and the wires, vacuum hose to the fuel pressure regulator also. The PCM have been reflashed. All work was done by a Mitsubishi dealorship, whom couldn't figure out the problem. I took it to a separate shop and his final conclusion was all systems are working fine, working just like the computer is telling it to. So he doesn't know the answer either. I also did a fuel injection system cleaning. If all systems are working fine, what could be the problem? I personally think its the ECU itself. Your thoughts? Thank you.

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  • dadurtysway Oct 02, 2008

    i currently have a evo 7 2001 import 4g63 turbo, im getting the engine light also. ive checked all fluids hoses etc etc, i was advised to reset by d'c battery. but that was for 1 min.. ive since doen it for half an hour and still early to tell yet. lets hope it dont come on. ive also made enquiries with a mitsubishi service place, to get a diagnosis.



    but for now lets hope the damn light stays off.

  • hungm3vo Mar 11, 2009

    i have an evo 8 fq300 2003 and the engines lights comes on, which i have checked is a misfire and there is a strong smell of petrol. sumtimes it lose power with a jerky start or even stall.

  • Anonymous Apr 17, 2009

    I also have a problem like this, have changed everything, my misfire is only in 5th and before its on boost, found info that says if 5th gear wears out it can cause a random misfire.

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I recently had the issue too. There's a newer version of the ECU code that fixes it. Your local dealer should be able to do it for free.

Posted on Oct 22, 2009

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It could be numerous things missfire can only be bad ignition or a boost leak? check your maf sensor give it a good clean make sure plugs are gapped right if all fails could have cracked head do a compression test

Posted on Nov 05, 2009

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I had the same problem, and i did everything as urs, finally got to a conclusion that i had a problem with my cylinder or piston or gasket. if i had replaced those , it would had been fine.

Posted on Dec 19, 2008

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Look if al your boost hoses are ok.if a hose hase a hole it wil have a wrong reading and then to much fuel wil enter the engine

Posted on Jul 09, 2008

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Try resetting the computer yourself by leaving disconnected from battery for at least 30 min! Then see if it comes on! You might want to buy a OBD2 reader from auto zone to troobleshoot your codes and see exactlly what your computer is saying!!! But if your not feeling the missfire/miss or hearing it then it could be the ECU itself..But try resetting it your self see if it goes off!

Posted on May 15, 2008

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Hi Jason:
A Random/Multiple Cylinder Misfire Detected unfortunately doesn't tell you specifically which cylinder(s) is/are mis-firing, nor why.

A code Random/Multiple Cylinder Misfire Detected may mean that one or more of the following has happened:
Faulty spark plugs or wires
Faulty coil (pack)
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Faulty fuel injector(s)
Burned exhaust valve
Faulty catalytic converter(s)
Stuck/blocked EGR valve / passages
Faulty camshaft position sensor
Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.

Random misfires that jump around from one cylinder to another (read: P030x codes) also will set a P0300 code. The underlying cause is often a lean fuel condition, which may be due to a vacuum leak in the intake manifold or unmetered air getting past the airflow sensor, or an EGR valve that is stuck open.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

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1 Answer

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