What does this pipe do?

BX Tech talk
adamskibx
BXpert
BXpert
Posts: 950
Joined: Fri Jul 22, 2005 9:26 pm

What does this pipe do?

Post by adamskibx » Mon May 19, 2014 7:04 pm

Hi - I just prepared my car for it's journey to the new owners house and noticed a split rubber pipe which leads from below the carb to after the air filter. I have fixed it by clipping off each bad end and making up the length with a piece of electrical cable outer as that's all I had to hand, but what does it do? It certainly doesn't run right without it connected. As far as I can tell it would suck in extra air when idling, and comparatively less air when running flat out as there would be a more of a vacuum between the air filter and carb at high speed. Is it called an idle correction pipe? It sometimes comes loose which is why I checked it, and the car is a bit hesitant in traffic when it's loose.

User avatar
JayW
1K Away
1K Away
Posts: 1590
Joined: Thu Dec 07, 2006 6:40 pm
Location: Now listen here you mullet...
x 13

Re: What does this pipe do?

Post by JayW » Mon May 19, 2014 9:26 pm

It recirculates crankcase gasses to the inlet manifold under vacuum i believe.
I have zero patience for your tedium.

rutter123
Over 2k
Posts: 2175
Joined: Sun Sep 02, 2012 9:54 pm
Location: South Lincs
x 53

Re: What does this pipe do?

Post by rutter123 » Tue May 20, 2014 6:04 pm

And if its loose or disconnected or broke it will upset the idle, causes low speed running issues.
90 BX Tzd turbo 294k SORN undergoing major surgery
90 BX Tzd turbo estate 46k awaiting surgery
65 Peugeot Boxer Van the new workhorse
52 Toyota Rav4 180k Bulletproof Jap reliability

adamskibx
BXpert
BXpert
Posts: 950
Joined: Fri Jul 22, 2005 9:26 pm

Re: What does this pipe do?

Post by adamskibx » Tue May 20, 2014 8:06 pm

OK, thanks, well the botch seemed to do the trick and it idled well with it connected up.