I've noticed this a couple of times that when I turn on my AC, and I'm stopped the RPM's start jumping. I've ran the AC Twice this summer. Any ideas on what might be causing this problem. I have no engine mods yet on my 2002 Cavalier 2200. Any information is appreciated.

Thanks,
Josh

Most likely normal. The engine is working harder when the AC is on.

Rob





Sold 2/2/05

Got a tach? A few hundred rpm's when the AC is firsr engaged is acceptable.

but to jump from like 800 to 1500-1800? Is that acceptable? And to make the engine surge forward when stopped?

thanks,
Josh

SgtCMofo wrote:but to jump from like 800 to 1500-1800? Is that acceptable? And to make the engine surge forward when stopped?

thanks,
Josh

No that isnt normal. If this car was my job to fix the first thing I'd do is use a scan tool and look at the IAC valve count at idle.

I know you dont have a scan tool, but thats the first thing I'd be looking at.

The reason being at idle the engine is under load from the trans, the A/C, and any other accessorics you have on.


- 2004 Cavalier - 124k, owned since new