E36 m3 evo idling problem

[Lennym3]

Hi all

Can any one help me out
I have a 1996 m3 evo, when I can the car sometime she idles fine then after
awhile starts to run rough. After heating up I rev her abit and she runs smoothly
then after awhile starts to run rough.
Any suggestion on where to start?

[Schermerhorn]

Idle control valve

Ignition coil


Try some injector cleaner first

[Output Flange]

Start by reading the codes. I'd put money on it being a Vanos solenoid.

[_Neal_]

Definitely get it on a diagnostic, but add a possible air leak to the list - perished hose under the airbox or similar. Probably not the MAF, but worth checking that too.

[lord trumpton]

A failing exhaust camshaft solenoid valve within the Vanos.

The soldered joints fracture

[Schermerhorn]

I had mine diagnosed.

2 lambda sensors and an air leak from the air box I believe.

Get it on the diagnostic machine.