Aux. air regulator

maurice povey · 06-15-2010, 07:22 AM

Have just bought a new Bosch aux air regulator part no. 0208-140-171 and fitted it to my 73 2.4 CIS engine, which has cured my cold engine idle problem. But when the engine is hot the idle speed stays high. (If I pinch the hose to the aux. air regulator the engine drops to normal idle speed.)

I took it off again and tested it on the bench; the valve seems to close OK (I can't see any daylight through it) but I can still blow air through it when its in the closed position. Does this mean the valve is faulty, or should it still allow air through when in the closed position?

Cheers, Maurice (UK)

prebordao · 06-15-2010, 08:36 AM

It may sound silly, but where did you connect it to ? Did you use the hoses going to the decel valve ?

jjrowe · 06-15-2010, 08:58 AM

Have you connected the 12v power source? If not it won't heat up and close properly.

maurice povey · 06-15-2010, 10:15 AM

Quote:

Originally Posted by prebordao

It may sound silly, but where did you connect it to ? Did you use the hoses going to the decel valve ?

Hi Thanks for your quick reply, I connected the air reg in parallel with the decel valve by tee-ing into the hoses going to the decel valve. I can't see the point of fitting the air reg if it still allows air through although it does restrict the air a little when the its closed.
Cheers

prebordao · 06-15-2010, 11:42 AM

If they're in parallel, maybe air is going through the decel valve when the reg is closed. Try disconnecting (and plugging) the vacuum line going to the decel valve.

I'm interested in your findings cause I've been thinking for a while in doing the same. I even bought an air reg...

maurice povey · 06-15-2010, 11:55 AM

Hi again
I'll give that a try, but in the meantime could you connect your reg to 12v and see if when it closes, you can blow air through it?

Maurice

prebordao · 06-15-2010, 03:01 PM

I have it in a box, I didn't get to plug it in, but I tried it with 12V and it closes completely.

However, it might naturally allow some air to pass through as it doesn't seem to have any rubber seals that would make it completely airtight. But probably not enough to rise the idle.

Did you buy it new ?

maurice povey · 06-16-2010, 12:55 AM

Yes i bought it new last week, going on from what you said about your reg i've decided to take it back to the supplier and get them to change it. I may have been unlucky to have got a faulty unit! I,ll keep you posted on the result.

prebordao · 06-16-2010, 02:25 AM

I just remembered... did you waited long enough for it to close completely ? I think it takes about 6-8 min

maurice povey · 06-16-2010, 06:43 AM

when i had it fitted on the engine i took the car for a run for 30mins and it was up to full temp, thats when i started to investigate why the revs where too high on idle, so pinched the hose to the reg and down came the revs to normal, so it's got to be the reg.
cheers

prebordao · 06-16-2010, 07:51 AM

Yep, I agree. should be the regulator.

JFairman · 06-16-2010, 10:35 AM

you can make a manual one from a cheap water cooled 924 heater valve.

same overall size, exact same hose connection diameters, and you operate it with a cheap generic choke cable or lawn mower throttle control.

total cost is about $25 and works absolutely perfectly.

maurice povey · 06-16-2010, 11:49 PM

Hi JF
Thanks for the tip on going manual, i'm still trying to establish wether the reg i bought should close off completely or it allows a small amount of air to still pass through? if this is the case then the reg i have isn't faulty. If all else fails i'll go with your manual set up.
Cheers
Maurice

stlrj · 06-17-2010, 06:23 AM

There's nothing wrong with it. It is designed to be secured to an aluminum casting on a manifold to absorb heat from a warm engine. There is no place to mount it on your engine.

prebordao · 06-17-2010, 06:30 AM

Maurice, where did you put the reg ?
I was planning on bolting mine to an aluminum bracket that would sit between the WUR and manifold...

maurice povey · 06-17-2010, 01:52 PM

I made a bracket and fitted it to the existing ally mounting which takes the accelerator linkage (just inboard from the wur) so that it would pick up engine heat as well as eletrical heat, there are two threaded holes in the ally mounting bracket which don't appear to be used on my engine.

M
.

maurice povey · 07-12-2010, 02:13 AM

Hi
Following on from previous posts, i have now abandonded the the idea of using the air reg, and have fitted a 12v solenoid valve in parallel with the de-cel valve which is operated from a switch on the dash, this when open allows just enough extra air to lift the engine revs when cold. Not the solution for the "purists"but my car isn't original anyway (9146 2.4k-jet)
Cheers Maurice

prebordao · 07-12-2010, 02:18 AM

But why use that instead of the hand throttle ?
My idea for the air reg was to have a completely "auto" system...

prebordao · 07-12-2010, 02:26 AM

But why use that instead of the hand throttle ?
My idea for the air reg was to have a completely "auto" system...

maurice povey · 07-14-2010, 02:21 AM

Hi Short answer to your question is i don't have the hand throttle set up anymore, whilst i agree it would be nice to have a fully auto set up it's not as simple as just fitting an air reg which appears to work together with other componants, all getting a bit too involved/expensive!! After all it's only needed for a for a few minutes and works fine.
Cheers
Maurice.