M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => Engine management => Topic started by: offroadfan on February 25, 2013, 06:49:13 PM

Title: Very low idle when cold
Post by: offroadfan on February 25, 2013, 06:49:13 PM: Hello!
Sorry for my english but i'm Polish and i have a little problem with my '93 BMW E36 1.8is M42.

So, when i try to start my engine after night, the car won't start unless I press the throttle. When im stop pressing it, the car engine is stopping or have 500rpm. When i ride 5-6km and the car temperature get higher, the idle are around 650rpm. The car engine stopping when i give him a 4000rpm and leave to fall dawn.

The fuel consumption is high, the car is very poor (it accelerate like vw golf mk2 1.6).

I check car on the computer, there is no any error. MAF is OK, spark plugs and ignition cable changed to new one.

I have a question, in the IAC valve there is a small plunger, how it should look?
Look at my video:
http://youtu.be/_3jlkimoUQE
Is it work proper? It's move only a little bit, 1millimeter. When i try to get it fully opened, the plunger dont move. Is it normal?
And when I pull up the 2-pin connector from IAC nothing happen.

Thank you in advance for your attention, and any help.
Title: Very low idle when cold
Post by: keflaman on February 25, 2013, 10:35:30 PM: Hello and welcome to the forum. It's always a pleasure to welcome another member from the international community into our little circle.:)

The E30 and E36 M42 use the same ICV and according to the BMW manual you should hear and feel a click from the valve when you turn the ignition on and off.

If I remember correctly, I pulled my valve off and watched the plunger rotate considerably more than 1mm when I cycled the ignition. You can squirt a solvent/lubricant or light oil into the valve to try and free up some more movement.

Check your temperature sensors for proper resistance as well. It sounds possible that the DME isn't getting a signal that the coolant is hot and is compensating with more gas.

I hope this helps a little and by the time you test and check my suggestions other, more knowledgeable members will be up and reading the day's new posts over their breakfast.

At least that how I start my day out!:D
Title: Very low idle when cold
Post by: offroadfan on February 26, 2013, 12:59:23 AM: I checked temperature sensors. It seems to be okay, when it's cold there is a 2500 ohms, when warm the ohms fall down.