2003 Eclipse GT Tachometer Gauge (Hunting Idle) P0300 Random Misfire

[EricTheCarGuy]

You might want to do a power balance test to see if you can verify that it actually is cylinder #3 that is the problem. If you find that it is you might check the fuel injector for that cylinder as it may be having issue, I say this because by your description you seem to have covered everything else. Keep me posted.

[aceofstyle]

@EricTheCarGuy Thanks for taking a look at my problem Eric. I can't verify which cylinder is misfiring (I thought P0300 was random), and I just tried cleaning the IAC, and did the power balance test you suggested. The power balance test showed to me that there was an equal amount of power loss with each cylinder coil unplugged, and not one weak cylinder.

I'll try and stay on top of this until I find out what's wrong.

[EricTheCarGuy]

@aceofstyle Just for the heck of it you might want to look into an injector cleaning, not the kind that you get in a can and dump into the tank but a professional job done with an injector cleaning kit. Also make sure you are using the recommended plugs for that engine, cheep spark plugs can cause all kinds of problems.

[aceofstyle]

@EricTheCarGuy I think I'm going to have to do that as my next step. Here's a video of the idle with the o2 sensor before the CAT unplugged. Just looking to see if my CAT is plugged up or not. I can't tell if it's fixed. I "think" it's idling better but I don't know if that's 100%. What do you think? (I'm not sure how to send it but it's titled "2003 Eclipse GT Tachometer Gauge (Hunting Idle) P0300 w/ CAT UNHOOKED") I appreciate it Eric!

-Mike