Rough idle 2004 Aveo?

[Nicholas A]

My Car idles rough. It also used to idle high. I knew it needed a tune-up, so I did that, replaced plugs, wires, air filter. Now the idle has gone down to where is should be, but is still a little rough, like there is a misfire. Any idea what could be causing this?

[j_bryon]

Is your "check engine" light on? If so, most likely you Oxygen (O2) sensor would be bad and could possibly be causing your problems. It's a cheap replacement and would be something you'd want to replace during a tune-up anyway.

You might also have a problem with your ignition module or your MAP sensor. Either one of those components could cause a misfire and/or a rough idle.

I once replaced my air filter but didn't seal the air box back properly and because of the increased and dirty air flow I caused a rough idle. Make sure this isn't happening to you.

All in all, you may want to take it to a repair facility and have it connected to a scope. That is the only surefire way to find and diagnose what is causing your problem.

I hope my answer helps you out!

[kirby242007]

i had one with a bad coil with di hope this helps