Erratic Idoling

[Epoc]

Hi Guys,

Anyone experiencing erractic idoling problems? This is on my E46 325i.

When driving for example and you put into neutral coming to a red robot, the idoling bounces up and down from 800 to 500 and back for a short period.

Then when parked and idoling, I tap the accelerator slightly and as the needle drops and you consistenly do the tapping it evenly drops below 500 and wants to cut out as the needle bouces up and down ????

This only started happening when the dealership replaced the alternator and it is also making a whizzing sound from the alternator.

Any ideas?

 

[E36_325i]

Sounds like your idle control valve needs a clean...

 

[Budleigh]

Switch deities?

 

[applehero]

Switch deities?

Perhaps that will make the whole process alot less erratic. :rofl:

 

[firaz]

Where does one locate the idle control valve and how do you clean it?

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Where does one locate the idle control valve and how do you clean it?

 

[Spy007]

search e46 forum.

http://forums.bimmerforums.com/forum/showthread.php?t=454501


http://www.bimmerfest.com/forums/showthread.php?t=248979


I have posted aswell as I have the same problem on the gopher. (318 e46 A/T)
I have gone thrugh a list and with the big Z's help we are norrowing down what it might be.

Code it gives us is 2D29.

Also that it running rich. As I narrow down and solve I will post.

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Things we HAVE Checked.

MAF
Throttle body
Pipes for leaks. Need to take cover of to chack back pipes.)


We currently susspect a vacuum leak.

There is a DIY that I did on my throttle body removal and cleaning.


http://www.bmwfanatics.co.za/showthread.php?tid=8342
PS ignore the heading as only afterwards I realized I said Iddle valve instead of Throttle body. ))

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If it's a E90 your car doesn't have a ICV, it has valvetronic which varies the lift of the intake valves to control the idle as well as engine speed.

 

[Epoc]

Dealership had changed the DISA valve last week so that can be included on your list and still the same problem. Car is back in the shop today and spoke to the floor manager. So we shall see and will update as to how they fix the problem if it is fixed, hopefully.