ive got a vaccum hose coming from the canister and coming to a T at the throttle body, from the throttle body it goes to the egr solenoid, i cant seem to find it. It says it is just left of the fuel pressure regulator but i cant seem to find it, any ideas?

 

It's under the coil. Next to the distributor. (if you have a TPI)

 

is there any way somebody could have removed it, like the previous owner?

 

Holmes,

It sounds like you have a TPI, and you are describing the vacuum line from the timed port on the underside of the throttle body. That line has a 'T' which routes vacuum to both the EGR solenoid and the purge control solenoid on the EVAP canister:



You should have a similar label affixed to the underside of your hood.

Yes, this hose could easily have been removed. The EGR solenoid is mounted on a bracket just to the right of the distributor (passenger side). There are only two hoses connected to the EGR solenoid. The third port is an atmospheric vent that should have been covered with a small foam cube to act as a filter. Most cars no longer have the foam "filter", but it isn't a major problem.

The rear (top) black tube connects to the EGR valve itself. The front (lower) gray tube connects to the 'T' fitting at the throttle body.

 

thanks, things are alot clearer now, but i noticed on the diagram, there is a port coming from the plenum that reads "to HVAC," what is this? Also apparently the guy who owned the car before me removed all of the EGR w/ the exception of the valve. He also removed everything associated with the AIR w/ the excetion of the tubes. What kinda affect will this have on my car/performance? Once again thanks for all your help.

 

Holmes,

That rear vacuum fitting on the plenum connects to all the other vacuum devices on the car, like the cruise control servo, heater controls (HVAC), EVAP canister purge line, and others. There should be a single vacuum hose connected to it.

As for the lack of EGR and A.I.R., the EGR can help lower the combustion chamber temperatures and allow the EST to advance timing more, thereby producing more power at medium loads and preventing detonation at heavy loads. GMTech has a very good article on the system at www.sethirdgen.org.

As for the A.I.R. system, there is really no performance loos from NOT having the system, nor from having the system fully functional. What a functioning system can do is to allow the O² sensor to produce signal sooner, getting you into closed-loop operation sooner after starting the engine. This can save fuel, reduce emissions, and reduce contamination of the cat converter and O² sensor.

 

will lacking any of the above mentioned cause my check engine light to come on?

 

Without a vacuum source to the EGR system, you can generate a code '32'.

 

is there any way around it other than putting the egr back on?

 

You can write a custom EPROM with no EGR functions or just disable the error code in the programming.