is this normal?

when i have the AC on and im around 900rpms at a redlight the car vibrates a little. if i just lightly push on the gas and get to 1,100 rpms its fine

if i turn the AC off at idle its fine

 

do you have engine/transmission mounts?

I have stage 1 ottp mounts and mine vibe with the AC on. tiny vibes though.

 

Mine does it stock... Doesn't really bother me.

 

Yeah seems to be the norm. Mine does it too. It almost seems hit or miss because I know some dont notice it and some do.

 

It's a 4 cylinder engine. They do that.

Mine did it stock, stage II, tuned, etc.

 

loosen the 3 side passenger mount bolts by 1 turn each. Then re-tighten to 45lbs. may help.

 

solid motor mounts here.... I HATE my AC. Vibrations? Horrible. Not a "little vibs". Dash, steering wheel, everything shaking. Huge noticable driving difference. Sucks.

 

It's normal. You've got a large load on the engine when it's not making very much power at all at idle. Basically, it's slightly "lugging" the engine. It's normal though, so nothing wrong with it.

You may notice something similar when both of the cooling fans for the radiator turn. Once again, an engine load when the RPMs are low.

 

my sc gets it really bad with the AC on like when you ease into it the steeringing wheel will shake from 900-1100 rpms. polly tranny mounts FTL lol

 

Normal in just about every car I've driven, except Hondas.

 

^^ this

i just don't use my ac unless im cruising on the highway and not stopping.

 

my bosses 95 vtec civic does it. He even commented on it without me saying a word.

High load, small engine.