Aux Air Valve.... Is this it??

Hello all!

I've read lots of posts about the aux air valve causing cold idle problems.

When started from cold my engine really wants to stall. Idles fine once warm. Have tried squezing the pipe from the air box to the thottlebody so see if the revs drop, but not 100% sure if i am sqeezing the right pipe and whether i know were the aux air valve is….



If it, then i think it is broken as the revs do not drop when the pipe is sqeezed.

Thanks

Liam

The Aux. Air valve is right at the back of the inlet manifold almost running underneath it

I can get a pic of it if you need it?

the pipe that goes to the airbox from the rocker (top one from that 'T' peice you've circled) is the breather pipe

Cheers for speedy reply phill!
Oh well, will go out and have another look for it before it gets dark!!
Back in a mo

Liam

no problem  :y:

I've got the same cold idle problem so probably should go check mine before it gets dark but had enough of working on it for today  

I have found it now cheers,
Has a pipe feeding it from the big air pipe before the throttle and an electical connection? Right behind the inlet manifold.
I can't be bothered to stand out in the cold any longer either, so its gonna have to wait til next weekend now!

Cheers  

Liam

yeah that's the one. roll on summer so we can tinker with our Mk1's all day long!

heard they're not cheap for a new one though  :cry:

Yeah, can't wait til summer! Won't be long now!  8)

Will let you know how i get on next weekend.

Might invest in a volt meter too? So i can check a few other things too!

Cheers mate, I'm just deciding if I should sort out the cold idle problem or warm starting problem next (which is leaking injectors)  

I've had a look on GSF's website but can't find the aux. air valve listed (probably under a different name as usual!)  :cry:

Phil, Liam,

I have some used Aux Air valves

Cheers

Rich

Ah, I'll add one to my list for you  :wink:

I replaced mine (and it fixed a similar problem to yours). I think I did a search around for comparitive prices and found that GSF don't do them. ECP do, they list it on their website as around ?30 but it turned out to be nearer ?40 once the correct one (they vary, I think, between different years?) was determined and ordered, etc.

Its not too hard to test, luckily.

Hi,
Checked my aux air valve today….
Seems to work fine….
Engine cuts out when the pipe is blocked off.

So that makes me wonder what else could be wrong. :dontknow:
Any ideas on what could be causing a very low idle when cold?
I'm gonna need some new engine mounts soon otherwise!

It idles fine once the engine is warm.

Cheers,

Liam

Hmmm, this is a bit of a strange one because the car behaves properly when warm. It could be worth checking other parts, such as the fuel system (fuel filter, warm up regulator, tiny little fuel filter at tank side, fuel pump flowrate) as it may be that you're running really weak at cold, then once the car warm up it gets into normal running.