I hook a vacuume pump up to the EGR, try to give it vaccume, and just here a hiss noise come from it, and nomatter how much I pump, I cannot get it to do anything. I tried holding it up, then giving it vacuum, nothing. Should I replace it?

I'm failing emmissions (high hydrocarbons), and I have a code 32, a mechanic looked in a little book today and said it was the EGR so I had to replace the mapp sensor, because a bad mapp sensor can make it run rich. Ive never heard about that before, but earlier today when I was running my car with the exhaust after the cat taken off it smelled of gas.

My cat also rattled around, today I pulled a big chunk of loose honeycomb out, I know that that could definatly effect emmissions, but i'm more concered about the other stuff right now.

 

Pyro,

Your EGR valve is likely a negative backpressure pilot operated type, so connecting a vacuum source to it will have no effect, even on a brand new EGR valve. The hissing you are hearign may be completely normal because the pilot valve is venting the vacuum rather than operating the EGR.



Your high HC is probably going to be easier to correct with a good cat converter than a new EGR. It's easier to pass with a good cat and bad EGR than bad cat and good EGR. And since your EGR may not be bad, replacing it might be a complete waste of time and money.

Try this instead:

 

Where is the EGR located?

 

On the intake manifold, left side twords the back.