Purge Valve off Carbon Canister

[red325ix]

When doing my mototronic 1.3 swap on my eta, I noticed that I had an extra plug on the harness.

A little researched showed that it was for the purge valve in between the carbon canister and the throttle body

Right now I just have a vacuum line going from the canister to the throttle, with no valve.

Car seems to be running good, although I haven't been able to drive it much yet as I haven't had the exhaust done.

Can I leave this valve deleted? Its just going to be venting the vapors all the time now as apposed to sometimes. And if so should I loop the wires on the harness?

I think on older models its only a check valve and newer models its electronically controlled?

- a picture of said valve (courtesy of strictlyeta.net)

[jlevie]

You need the valve. A line straight to the canister is an intake leak.

[red325ix]

Thanks jlevie.

Do you think I can get away with a mechanical valve (way cheaper) instead of the electronic purge valve and leave the harness unplugged? Would the absence of an electronic valve cause the DME to react unfavorably in any way causing performance issues? Want to get it done right but would like to avoid spending an additional $100 if I can.

The car is a 325es that I think originally came with the mechanical valve. I have since converted to 2.7i (valve electronically actuated on motoronic 1.3).

The bentley states that the valve is closed at idle but open during normal driving. Strange enough the car idles like top.

[jlevie]

Spend the money and get the valve. The Bentley is partly correct. The valve is controlled by the DME and only opened when the additional unmetered air will not affect engine operation and learned fuel trim.

You should be able to find a good used valve for less money than a new part.

[SpecM]

^ yes. the valves rarely fail, so good used ones go for pretty cheap