Rep Power: 0

I have an 03 EP3.

When I'm idling at a red light or just in my driveway, the car is fine. But when I A. Turn the headlights on B. Turn the A/C on, or C. Turn the rear defroster on, the car shakes. When I do any combination of those, it shakes even more, especially the A/C being on. I dont know if it does when window motors are being used, I forgot to try that.


It's like whenever theres more power being used than just normal running, it shakes no matter what.

I can't tell if the shaking is still there when the car is actually moving.

Any ideas?

 
Rep Power: 233

You have a power problem, when you turn something on it pulls enough amps to where the engine stumbles because it doesn't have enough power to cause spark. Take it down to Autozone and have the alternator checked. They will check it for free.

 
Rep Power: 811

this happens when the IAC valve is clogged as well. it is tied to several systems and should bump the idle up when intensive accessories are used. if it doesnt, the car can rumble and sometimes stall.

 
Rep Power: 233

^^ +1. You learn something new every day.

 
Rep Power: 811

i cant remember everything thats tied to it. i know the brake light switch and a/c for sure, but there are a few others. that valve has lots of responsibility lol