[Yguildl]

at a stop if i roll my window down my cars RPMS drop a little and the car kinda vibrates.. any ideas?

[Elixir]

Please remove this reply from me, if you can.

[mooses]

Your rpms drop because of the power draw required to roll the window down. At idle, your rpms are low so when they drop even lower, you get that vibration where the engine almost wants to stall.

[Yguildl]

Originally Posted by mooses Your rpms drop because of the power draw required to roll the window down. At idle, your rpms are low so when they drop even lower, you get that vibration where the engine almost wants to stall.

Why would it draw that much power just to roll the window down, ive drove the car a year and its always done it never causing a problem--will it in the future?

[Yguildl]

Not would it, because obvioulsy no one really knows if it would but

COULD it cause a problem

[00BlueMustang]

Originally Posted by Yguildl Not would it, because obvioulsy no one really knows if it would but COULD it cause a problem

Not really. Next time your in the car turn your overhead light on and move your seat and you will notice that the light dims. Also try it with the car on and the same thing will happen.

[Yguildl]

Originally Posted by 00BlueMustang Not really. Next time your in the car turn your overhead light on and move your seat and you will notice that the light dims. Also try it with the car on and the same thing will happen.

I had a sound system in it but everytime the bass hit the lights dimmed in the interior, so i took it out.. i guess its the same concept.

[mooses]

Originally Posted by Yguildl Why would it draw that much power just to roll the window down, ive drove the car a year and its always done it never causing a problem--will it in the future?

It's because your alternator doesn't provide a lot of electricity at idle. What rpms does your car idle? Mine will drop when I lower the windows, but I don't think it's ever dropped the rpms enough to shake the car.

[mooses]

Originally Posted by Yguildl I had a sound system in it but everytime the bass hit the lights dimmed in the interior, so i took it out.. i guess its the same concept.

Exactly. Do you have a UDP?

[00BlueMustang]

Yeah mooses is right, you need a better alternator

[Yguildl]

Originally Posted by mooses Exactly. Do you have a UDP?

UDP??
Under Drive Pulleys?

and idles at 1250ish

[Yguildl]

But that is a pure guess.. I mean it idles fine, doesnt seem high or low,. I dont think its 2grand. and its not 1k

[mooses]

Originally Posted by Yguildl UDP?? Under Drive Pulleys? and idles at 1250ish

wow. Maybe something is wrong. A 1250 rpm idle is fairly high, and shouldn't drop far enough to make your engine shake. I assumed you had an idle around 800ish, you might need to get another opinion.

[Safi]

Originally Posted by Yguildl UDP?? Under Drive Pulleys? and idles at 1250ish

Holy shit bro...why you idleing at 1250?
You should be around 720-900

[Yguildl]

Originally Posted by commandersafi Holy shit bro...why you idleing at 1250? You should be around 720-900

Like i said i have No idea, Sadly ive neve rreally paid attention to it--ill make sure i check tomorrow. i fill retarted-because i dont know, but oh well. better to ask questions and learn then to just not no at all...

i guess i dont really pay attention to things like that?


ill try to remmeber to see what my RPM at idle is tomorrow,

[1REASUN]

Same thing happens to me. I actually just posted on a similar topic too about this.


my car idles real low and shakes my car when im at stop lights while holding down the brakes (i'm not pressing hard on them either). when i roll down the windows, i get the same effect. i have a sub woofer in the trunk, 12inch 800 watt, and hits hard, but it doesnt make the rpms drop unless i crank it so loud it hurts my ears. but with the "brakes" problem, i just put it in neutral while at stop lights and my rpms stay fine around 780-950rpm.


GL, i hope both of our problems get solved

[mrsinister2424]

Same thing happens to me. I actually just posted on a similar topic too about this. my car idles real low and shakes my car when im at stop lights while holding down the brakes (i'm not pressing hard on them either). when i roll down the windows, i get the same effect. i have a sub woofer in the trunk, 12inch 800 watt, and hits hard, but it doesnt make the rpms drop unless i crank it so loud it hurts my ears. but with the "brakes" problem, i just put it in neutral while at stop lights and my rpms stay fine around 780-950rpm. GL, i hope both of our problems get solved

Sounds like run of the mill load being placed on the alternator. Wouldn't worry about it much. Do you have a capacitor hooked up to your system? That would certainly help your lights not dim as much when the bass hits.

[joparrett]

if your car idles at 1250 you need to check it out something is wrong vacuum leak or something

[1REASUN]

Originally Posted by joparrett if your car idles at 1250 you need to check it out something is wrong vacuum leak or something

+1

[willis6er]

lol i notice the exact same thing yesterday about the lights dimming and shaking. the car itself isnt shaking its the motor that rolls the window down inside the door that is "shaking". at least i think thats what does it because only my door shakes.