M50Vanos idle with AC on too low

[Jean]

What to look for if the idle drops to almost/below 400 at stop signs/red lights if the AC is on.

93 525i.

[10Toes]

I think you are suposed to have a wire hooked up that tells the DME when the AC is on.

[Jean]

Stock car. Idle does go up when ac button is pressed.

Idle just drops too low when you slow down to 0 etc.

[samiam3356]

think it has something to do with the wires in the glovebox. I know there is a thread on tech that explains how to handle this. It was discussed on here in the last week or so.

[samiam3356]

here's one

http://www.r3vlimited.com/board/showthread.php?t=89460

I know there are more

[Jean]

Yeah I understand DME gets a signal from A/C and bumps the idle. I don't think thats the same issue my car is having.

This is a 100% stock e34 with m50 vanos engine, the idle GOES up when the A/C is turned on which leads me to believe DME gets the signal.

The issue is low idle with AC on when coming up to a stop.