I went to smog the Iroc and failed I am not sure what I should troubleshoot any suggestions would be greatly appreciated.

Car Pecs:
1989 Iroc 5.7 w/rebuilt motor 30,000 miles ago.

New Parts on the car with less than 3,000 miles.
Spark Plug and Wires
Magnaflow CA Catalytic Converter
Recent Oil Change
195 Thermostat




]

 

What is your timing at? Also check your egr. The high NO levels suggests your egr isn't functioning properly.

 

Timing is at 6 degrees, I guess new egr is in the new parts list to buy.

 

I would target the EGR valve.

 

Another part that fails is the egr vacuum solenoid by the distributor.

 

Game plan is removing the plenum and replacing the EGR valve, solenoid, and fuel regulator since I am already their and its the original 240,000 mile one, replace the manifold air temperature sensor (spontaneously received a code 25 SES), and verify all vacuum lines. Fingers crossed.

 

Double check the egr passages as well to make sure they are clear.

 

Max in CA is 500? geez here its like 1500. CA is strict af
And an 89 still has to get tested? How old before it no longer has to?

 

It will require emissions testing forever, anything 1975 and newer requires emissions. It will never matter how old the car gets.

 

The EGR solenoid looks to be missing a vacuum hose.

 

The missing line runs to the bottom of the throttle body. So your egr wasn't getting any vacuum to work. Looks like you found the problem

 

Fingers Crossed.