pmansson
Well-Known Member
this vital part on one of my cars is not working properly. The idle won´t go below 1500 rpm.
new ones seem impossible to find...
new ones seem impossible to find...
Cold start valve for a CSi
- Thread starter pmansson
- Start date
@sfdon rebuilds these to as new condition.
e9coupe.com
Any interest in rebuilt air slide valves for csi engines?
Im now making these in the shop. New bulb installed and tested individually. 220.00
e9coupe.com
Is the issue you're seeing the cold start valve or the aux air valve?
I think of the cold start valve as the 7th fuel injector, which dumps extra fuel into the manifold on a cold start
The aux air valve (aka the slide valve) is the extra air intake, controlled by the wax bulb stat.
Your issue sound like aux air valve, which often causes issues as you describe, i.e. the extra air intake can either jam wide open, or not fully close when engine is up to running temp
Can be rebuilt. I've done a temporary fix on my car by carefully squeezing the wax stat bulb in a vice, just a wee bit, to move the "closed" position on the AAV. I suspect if your AAV is jammed open then this temporary fix is not going to help.
I think of the cold start valve as the 7th fuel injector, which dumps extra fuel into the manifold on a cold start
The aux air valve (aka the slide valve) is the extra air intake, controlled by the wax bulb stat.
Your issue sound like aux air valve, which often causes issues as you describe, i.e. the extra air intake can either jam wide open, or not fully close when engine is up to running temp
Can be rebuilt. I've done a temporary fix on my car by carefully squeezing the wax stat bulb in a vice, just a wee bit, to move the "closed" position on the AAV. I suspect if your AAV is jammed open then this temporary fix is not going to help.
I also used to take the hose that goes to the manifold off at the auxiliary valve when the car was warmed up, and block the opening with a large cap.
I also did remove the auxiliary valve and boiled it in pan to free up the movement and or see if it closes fully at hot temperature.
I also did remove the auxiliary valve and boiled it in pan to free up the movement and or see if it closes fully at hot temperature.
Simufly
Well-Known Member
It sounds to me like a stuck AAV. Asimple check with a warm engine is to put you hand over the intake on the filter/silencer for the AAV. If there is suction and the revs drop its the AAV. You can then either block off the input on the plenum or replace the AAV!
I just shipped units to Carl Nelson at La Jolla Independent
He may a few left.
He may a few left.
pmansson
Well-Known Member
Thanks to all. Yes, it is the AAV. I just removed the filter and put my finger tip against the tube , and the revs dropped to normal (with hot engine?
how important is the filter? How about replacing it with a wine cork?
how important is the filter? How about replacing it with a wine cork?
Simufly
Well-Known Member
As the name suggests its a cold start valve so when the engine is warm it is not is use. without the filter there is a direct path for any debris to go straight into the cylinders. If you can do without the cold start then just block off the inlet on the plenum until you get the system refurbished or replaced.
Available on Swiss ebay....
And dealer
www.getbmwparts.com
And Carl
Carl Nelson La Jolla independent
And Pelican
And me
Or you can re-build your own. I don’t recommend it.....
In Norway: kit with instructions
And dealer
Genuine BMW 11-61-1-263-200 | Additional Air Slide Valve H11520 | FREE Shipping on Most Orders $499+ OEMG! | getBMWparts
Shop Genuine OEM BMW Additional Air Slide Valve H11520 - Part # 11-61-1-263-200 - & Enjoy FREE Shipping on Most Orders $499+ OEMG!!
www.getbmwparts.com
And Carl
Carl Nelson La Jolla independent
And Pelican
Air Slide Valve Genuine BMW/MINI 11.61.1.263.200 11611263200 11-61-1-263-200 11 61 1 263 200 | Pelican Parts
Genuine BMW/MINI Air Slide Valve Call (310)626-8765. May Qualify For FREE SHIPPING. Parts# 11 61 1 263 200 11-61-1-263-200 11.61.1.263.200 11611263200.
www.pelicanparts.com
And me
Or you can re-build your own. I don’t recommend it.....
In Norway: kit with instructions
AAV element for Bosch Auxiliary Air Valve | eBay
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