idle rpms too low, excessive vibration
Quite often when the engine is idling with the foot off the pedal, rpms get so low as to cause my inner door panels to vibrate excessively. I'm not talking about the interior panels, but the door frame that the window motor is mounted to. You can typically only hear the vibration because the panel covers it, but I have had my panels removed quite a bit lately from doing custom speaker and dampening sheet application, so watching them flex like a giant subwoofer with about a half inch excursion is sort of unsettling.
I noticed if I give it just a wee bit of throttle and get the rpm's up by a couple hundred, it goes completely smooth again and vibrations disappear. Engine idle speed is a basic function and I assume the computer controls it. Is there any easy-ish way to adjust it a notch higher? Maybe just a simple mechanical adjustment on the throttle assembly?
I have a very new rear motor mount, as of the day I bought it last year in April. I'm wondering if I should go ahead replace the other 2 anyways, even if they don't play a part in this but I'm guessing they probably do.
'03 Blue 5 spd with 900 watts of hifi audio, Matiz springs & Monroe dampers