m40 316i intermittent idle when cold

[dan2241989]

Hi all, pretty new to this scene! recently bought a 85k 316i with an m40 engine. Ive noticed when its cold it really struggles, so have done the obvious things like plugs ht leads, rotor/distributor. The idle still fluctuates and the car still isn't that happy cold. Ive noticed that the hoses from the throttle body warmer + idle control valve are split. This is on order.

Out of interest, if this doesn't solve this, does anyone else have any ideas / thoughts to what it could be?

Thanks in advance!

[soul4t]

Welcome,

Usually vacuum leak is most likely, worth checking blue coolant temp sensor reading at cold and hot at the ECU.

Have a read of the wiki page on it, very useful info on the wiki!

How is it when hot? What temp does it get to on the temp gauge when 'hot'?'

[dan2241989]

When it's hot / warm it idles lovely. The gauge sits right in the middle too.

[soul4t]

Great,

Let us know how it behaves when you change the icv vacuum hose...it's the one moulded to a coolant hose right?

Also worth checking the Throttle position switch...also on the wiki...all you need is a multimeter!

[dan2241989]

I've ordered the hose that comes out of the icv to the air duct / inlet hose, which also as you says is moulded to another Pipe which is the throttle body warmer? So hopefully this does the trick.

I've checked the ohms resistance on the icv which is all good.

Thanks for your advice dude, fingers crossed it's nearly sorted!

[soul4t]

I know this is really old but did you get it sorted?