EGR System (On Vehicle): Notes
Ensure that all vacuum hoses are not crimped, cracked or broken and that hose routing is in accordance with the emission decal for each calibration. There should be no vacuum at the EGR valve at idle. If so, recheck for proper hose routing. At normal operating temperature, there should be vacuum to the valve at 3000 to 4000 RPM.
NOTE:
On all EEC equipped vehicles, EGR solenoid function and operation must be verified before performing other tests.