Pontiac Fiero 1988 Service Manual page 561

6E2-C7-4 D R I V E A B I L I T Y
A N D
EMISSIONS -
FUEL
INJECTION (TBI)
CHART C - 7
EXHAUST GAS RECIRCULATION
(EGR) VALVE CHECK
(NON-ECM C O N T R O L L E D )
2.5L "P" SERIES ( T B I )
• HOLD TOP OF EGR VALVE AND
TOY TO ROTATE TOP OF VALVE
BACK AND FORTH.
NO LOOSENESS FELT.
IF LOOSENESS IS FELT.
• PLACE TRANSMISSION IN P/N.
• RUN W A R M ENGINE AT IDLE. ENGINE TEMP.
ABOVE 90°O195°F.
© PUSH UP ON UNDERSIDE OF EGR VALVE
DIAPHRAGM. RPM SHOULD DROP.
REPLACE VALVE.
RPM DROPS.
NO RPM CHANGE.
CHECK FOR MOVEMENT OF EGR VALVE DIAPHRAGM AS RPM
IS CHANGED FROM APPROX. 2000 TO IDLE.
E
DOESN'T MOVE.
CHECK VACUUM AT EGR VALVE AS ENGINE
RPM IS CHANGED FROM APPROXIMATELY
2000 RPM TO IDLE.
UNDER 20 KPA (6 INCHES)
CHECK V A C U U M HOSES FOR RESTRICTIONS,
L E A K S , AND CONNECTIONS.
OK. NO TROUBLE FOUND.
CLEAN EGR VALVE OR PASSAGES
OR REPLACE VALVE AS NEEDED.
MOVES
NO TROUBLE
FOUND
OVER 20 KPA (6 INCHES)
REPLACE EGR VALVE
1
NOT O K - R E P A I R
* 4 S 1325-6E
CLEAR CODES AND
CONFIRM " C L O S E D L O O P " OPERATION AND WO "SERVICE ENGINE S O O N " LIGHT. 6-07-85