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nramil
01-20-2008, 10:15 PM
I have 2000 528i that when I warm up in the morning (in park position) I notice the the rpm fluctuates from 9k to 5k. Sometimes it goes to low and engine shuts off. After it warms up it seems to be fine. Sometimes while at a stop light idling (in drive position) it also flutates. Anybody ever of this issue?

BillP
01-20-2008, 10:38 PM
Hopefully you mean 500 to 900 RPM.

Symptoms point to a dirty ICV (Idle Control Valve). Search here, bmwtips.com, and elsewhere for instructions how to clean it.

It could also be something else, including one of the sensors, such as the MAF or CPS, but the ICV is (IMO) the likely culprit.


Bill

Vipsa
01-20-2008, 11:14 PM
I'd take a guess on bad Vanos. I have the same thing happening and will be replacing the seals on the Vanos unit as soon as it gets warmer.

poolman
01-21-2008, 02:18 PM
Plus 1 on the Vanos as the problem--check out Beisan Systems for the complete write up on whats going on.

Rajaie
01-21-2008, 02:20 PM
I have 2000 528i that when I warm up in the morning (in park position) I notice the the rpm fluctuates from 9k to 5k. Sometimes it goes to low and engine shuts off. After it warms up it seems to be fine. Sometimes while at a stop light idling (in drive position) it also flutates. Anybody ever of this issue?

This is the classic failing vanos seals symptom on the i6 M52TU engine (99-00)
http://bimmer.roadfly.com/bmw/forums/e39/7494631-2.html
http://bimmer.roadfly.com/bmw/forums/e39/8705552-2.html

Captngeetch
01-21-2008, 04:30 PM
best case ....Dirty ICV...worst case...Vanos
Only happens in the cold weather ? Vanos
Happens all the time ? Poss. dirty ICV is one possibility

Garrison5
01-21-2008, 07:30 PM
Simple test - disconnect the solenoid connection on the VANOS, I belive it is the exhaust, on the left side of the VANOS. Start the car. No change in RPM, then you've got the VANOS issue.

Solution - Parts $65 from site listed above and about 4 - 6 hours of time following directions on the same site.

Result - No more fluctuating RPMs and better performance.

Jase007
01-21-2008, 07:42 PM
Only happens in the cold weather ? Vanos

Ditto. :)

Not a tough R&R.

poolman
01-21-2008, 07:49 PM
Vanos seals are a problem in every BMW on the road with single or double vanos systems
the 0 rings will not hold up to the demands of the engine--I only have what I've read in the past year to make such a statement-that reading and my own eyes that have seen the state of which my own Vanos seals were in when I removed them--they were crumbling.
I can also add that the new found power that the new seals have instilled in my 100k mile car is making it a great pleasure to drive again..The job to replace the seals will take around 5 hours but for me it was well worth it--damn car wants to fly up hill now --not just down hill.

tarek
05-05-2008, 10:46 AM
Guys, is the v8 engine has the same problem? i read almost all the posts here and all about 6 cylinders engine. i'm having the same symptoms of vanos seals failure!!

poolman
05-05-2008, 11:04 AM
i6 cars only have the fix as for now--Not sure what Rajie is working on for the v8 cars.

Neils528iM5
05-05-2008, 11:13 AM
Had the same issue for months with the idle fluctuating,
First I cleaned the ICV and Throttle Body but nothing changed then I change the Vanos seals about 3 weeks ago with some help from Rajaie and now its as good as new..
no more idle issues and the car runs better than before.

With the Procedures at Beisan systems the task is a lot easier and very straight forward.

Vanos Issues seems to be a very common thread.

TROME32
05-07-2008, 04:54 PM
I'm glad you made this post because my 00 528i is doing the same thing. Guess I'll get my Vanos checked also.

poolman
05-07-2008, 07:25 PM
There's no getting it checked--the seals are bad from the get go--BMW used faulty materials as a design in these units--further more the units they replace have the same seals---the only fix is the seals from Besain Systems---they stand up

PJB.
05-07-2008, 09:31 PM
I'm glad you made this post because my 00 528i is doing the same thing. Guess I'll get my Vanos checked also.

Just like poolman said, self-diagnosis is simple. As per the Diagnosis section of Rajae's VANOS write up (http://www.beisansystems.com/procedures/vanos_procedure.htm):

"With M52TU engine autos (98/99-00) with cold engine idle jolt symptoms, the vanos intake solenoid (metal cylinder) electrical connector can be removed. If the idle jolts subside then the problem is the vanos."

Just try that. It's really open and shut. 30 second diagnosis.

razzy530
05-07-2008, 10:11 PM
Its definately ICV :rolleyes:

poolman
05-08-2008, 01:35 PM
It may well be that the idle control valve needs a good cleaning--if thats never happened as of yet---needless to say--the change out of these Vanos seals will bring the engines back power that has slipped away so incrementally owners do not notice--until they make the change over.