Need help with low rpm when a/c on

Louie55 · 05-30-2002, 05:18 PM

Hey everyone,
When the car is on and warmed up i turn the a/c on and the rpm's seems to drop. it drops low enough that the car shakes but not enough for it to stall. This is a 92 gs-r. Can someone tell me whats the problem or what i can check?

kev-inc · 05-30-2002, 10:14 PM

Is your AC working ok...cold air, clicking sound for AC compressor...?
How low is the idle? It can't be that bad... it's somewhat normal for the idle to drop... you can turn your idle control screw up a tiny bit and see if that helps with the shaking

Louie55 · 05-30-2002, 10:27 PM

Yeah the a/c works fine. no clicking sound either. the idle seems to be around 400 when i turn the a/c on. I tried the idle screw but that screw dont help at all. it dont even move the idle higher when the a/c is off.

ULTRA911 · 05-31-2002, 01:58 AM

did you disconnect the eacv sensor when you adjust the idle screw? my idle won't move unless i disconnect the eacv sensor. make sure when you perform this with nothing else operating except the engine, has to be at normal temp. once everything is set, turn off car, plug in eacv, reset ecu, then turn car on, should give a better idle with a/c on. if it bogs down, set the idle a little bit higher. doesn't solve your case?--your eacv is off and might need to be replace even though it's not shooting out any codes. i got a similiar engine as you, but in a 1.6 size.

Fooser · 05-31-2002, 07:05 AM

You A/C should actually make your RPMs go up a little.

Louie55 · 05-31-2002, 06:25 PM

Wheres the eacv sensor? i know the rpm suppose to go up when the a/c is on. Thats the problem, that its going down.

Anymore suggestions?

ULTRA911 · 06-01-2002, 02:58 AM

electronic air control valve (iacv, cold start sensor, etc, tons of name for it)...located behind the intake manifold. it's common for being off, but not breaking. if you know anybody with a 92+ Integra, 92+ Civic Si or EX, 99-00 Si coupe, 97-98 CRV...you could try switching it and see how it runs. two main bolts, two coolant lines to take it out and that's all. their sensors are the same.

99gsr · 06-29-2002, 07:48 PM

DONT USE YOUR AC. IT JUST SLOWS YOU DOWN. JUST OPEN YOUR WINDOWS

Fooser · 07-01-2002, 06:28 AM

You know the other day I turned my ac on right when I started the car and it made the rpms go down. Does this happen when you only turn the car on and warm up or is it always lower when your AC is on?

Louie55 · 07-01-2002, 06:32 AM

when u turn on the a/c the rpm's suppose to go a little higher.

Fooser · 07-01-2002, 06:38 AM

Quote:

Originally posted by Louie55
when u turn on the a/c the rpm's suppose to go a little higher.

This is true when your car is at operating temperature. when my car is warmed up the rpms rise a little. Only when my car is not warmed up the rpms drop slightly.

Integra2000LS · 07-02-2002, 10:57 PM

When I have my AC on my car is horrible, it is so much slower and there is a huge difference in power. My RPM's do drop a little but it's not to bad.

icando · 11-16-2012, 04:05 PM

my 04 honda crv idles rough when my ac is on. the mechanic said i should flush the system in case anything was clogged and blocking air flow, hence bogging down the engine. it blows cold and seems to be working well, except it sounds like its messing with the idle. Any thoughts? He said if that didnt work it could be something with the coils or something expensive.