Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
Sorry I can not help on this post. Last time I assisted i was never compensated. Opting out now.
Hi,The battery and brake lights could well be related to the poor running... these coming on is indicating that the system voltage is too low. This is usually due to a failing or aftermarket alternator on this model.I would start by supplying auxiliary power (charger etc) to the battery while running and see if it clears any... if it does, then address the charging problem.If it does not, then you will need to get back to basics and check the individual spark on each coil output to make sure all six are operating... obviously if not then you have a strong direction to head (isolating coils, checking belt timing for computer controlled coil shut down), and if you do have solid spark on all six outputs then I would move forward with compression testing the engine, checking the individual injector flows in case you have one injector that is sticking etc.
Yeah check that first... with the symptoms you have being pretty broad it may be something that is better seen in person for best interpretation.
Yes, it is possible to have the coils be weak, that is not unusual particularly with certain aftermarket coils that are of poor quality.I would try rotating the coils around and see if the strong one moves with the coil or if it stays on the same position (swap another coil in that position and it becomes strong for example).
If you are dropping spark entirely on those two coils and the coils themselves are not the issue (same positions drop when rotating the coils) your only possible causes would be PCM, ignition module, wiring, or belt timing. Since it comes and goes it seems, belt timing is out.The coils can be swapped, you just can't bolt one of them down in the wrong position, still works fortesting though.
Did you use a new genuine igniter? This is a common failure point on these so used ones are not a safe bet, and aftermarket electronics in general on Mitsubishis are a disaster most of the time.The fact that it went from nothing to running makes it sound like you were right the first time, you just may have gotten a bad part.
I would be trying a genuine Mitsubishi igniter first. Aftermarket ones rarely work even when brand new. Working for a dealer we see these towed in from other shops with aftermarket igniters and sensors on them all the time where all they needed was a "good" part and not just a "new" part. Aftermarket electronics and Mitsubishis do not mix... at all.