When was the last tune-up?
Test the EGR valve transducer and the control solenoid-make sure it getting vacuum
Inspect/Test EGR Vacuum Modulator
Disconnect the vacuum hoses from ports P. 0 and R from the EGR vacuum modulator.
Block ports P and R with your finger.
Blow air into port 0. Check that the air passes through to the air filter freely.
Start the engine and maintain speed at 2,500 rpm.
Repeat the above test. Check that there is a strong resistance to air flow.
If a problem is found, replace the EGR vacuum modulator.
Reconnect the vacuum hoses to the proper locations
Wednesday, March 2nd, 2011 AT 6:17 PM