RPM's Dancing

[bluelightning]

Hello everyone, im just wondering if anyone here has experienced the following. Once my truck heats up with the air condition on my rpms dance around at idle causing vibration through the steering wheel. I even had to get my custom exhaust tail pipes rebracketed because the tips where shaking so much from engine vibration that the noise was annoying. Much help appreciated. Ive already taken it to two GM dealers that dont service Hummer and both said this is normal for the vehicle, maybe a hummer dealer will say something different.

[Big Dad]

I notice mine vibrates somewhat while sitting at idle w/the A/C on...I think it's just the compressor taxing the trusty 5 banger. Nothing out of the ordinary though. I run the A/C practically year around in the Emerald city!

[bluelightning]

well when im at a stop light or stop sign i look at my rpms and it sits at about 600 then it will jump up and fall below 600 then go back every 8 to 15 seconds. And even passengers notice.

[Big Dad]

I'm gonna take a cruise and check it out again.

[Kaiser Souza]

My dealer said that the K&N system is what is causing it. Nasty idle vibration, I feather the idle in slow traffic.

[Big Dad]

At full stop with the A/C on, blower on high, I believe the compressor is on max with recirculation, my idle cycles from aprox 700-750 every 3 or so seconds. Minor vibration. 2006 H3.

[bluelightning]

yeah i had a k&n filter and removed it hoping it would help which i did two weeks ago, as of today it seems that the truck is slowly improving, another thing i was running platinum plugs, a service guy said that it wasnt a good idea so i took them off about a week ago. thanks everyone. more help greatly appreciated.