How does the diverter valve of my 3.1 LH0 engine work?
 

Hi,

I need more information about the diverter valve, which is installed on the air pump of my 3.1 LH0 V6 engine.

I do not understand for what the vacuum line is.

I noticed that the O2 sensor detects more O2 when the engine is running while I press the little vacuum hose in order to close it.

It is this black part on the backside of the air pump:

Link

Thanks.

Re: How does the diverter valve of my 3.1 LH0 engine work?
 

The purpose of the vacuum line to the diverter valve is to make sure that the valve diverts to the atmosphere. This is during decel when the vacuum is high enough to do this.

If it didn't divert the additional air can cause backfiring in the exhaust system.

RBob.

Re: How does the diverter valve of my 3.1 LH0 engine work?
 

Thanks.

Yes, I red this explanation in my repair guide, but I think there is a difference between V8 and V6 engines.

My V6 engine has a catalytic converter which is not connected to the diverter valve. So I can't imagine that the air goes to the exhaust ports when the engine is warm.

I believe that the vacuum line closes the port which is going to the exhaust manifold when the engine is warm and when it runs in normal conditions. I don't know if I am right - this is why I asked for more information here.