What is this piping for?

[otterstricks]

Hi folks, quick question for you; what are the two pipes that weave themselves through the intake manifold, one is connected to the underside of the throttle body intake and the other is connected to the rubber air intake boot via a small 90 degree elbow? I have an E30 3.18i with the M40 engine. They mate together half way down their length (although I don't think they are open to each other) and have numerous jubilee clips down their length, they are around a foot in length and just under an inch in diameter. Mine is split at the intake boot and I wonder what effect this would be having on my air/fuel mix.

Any help would be very much appreciated.

Murdo

[redcar]

It's to heat the throttle body. Hot water passes through the pipes.
Best to replace all the pipes in that sort of region as they split after a short while.

[balilu91]

it probably isnt water since he is saying its coming from the intake boot.

the one coming from the rubber intake boot is usually vacuum for the idle control valve

if its split and leaking you would probably notice that engine is not running well

[mwggriffiths]

The one attached to the intake boot is for the idle control valve. The ICV itself is located at the back of the engine, by the bulkhead on the intake/passenger side.

The split hose there may cause idle issues, stalling and so on If those are the issues you're having then that's your cause

[otterstricks]

Thanks for the replies fellas, I've been away all week so have just checked the post. Cheers for your input, it looks like it is the for the idle control as is does lead to a unit at the back of the engine. I've ordered new and hopefully this will help her run more smoothly.

Cheers folks

Murdo