525ix idle problem

[Rory525]

Hi Folks

My friend has a 1992 525ix auto , which idles strangley.

When in drive it idles at about 1300rpm, in neutral 2000rpm. Can anybody give any idea wat might cause this ?

Thanks
Rory.

[DaveVoorhis]

I'd suspect a massive vacuum leak on the engine side of the throttle body, and/or a failed Idle Control Valve, or somebody's screwed with the throttle stop screw in an attempt to solve a stalling problem.

[colo525i]

Check for cracked or loose hoses under the intake manifold. everything that hooks into there can cause a vacuum leak if it is unplugged. If not, clean out that ICV