Pontiac Fiero 1988 Service Manual page 696

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) 6E3-C7-5
ASSUMES NO CODE 32 IS STORED
©
• DISCONNECT EGR SOLENOID VACUUM HARNESS .
• ROTATE HARNESS AND REINSTALL ONLY THE EGR
VALVE S I D E .
• CHECK PORTED VACUUM SOURCE TO SOLENOID (IF
NOT O K , R E P A I R ) .
© INSTALL A HAND HELD VACUUM PUMP WITH GAGE
ON MANIFOLD SIDE OF EGR S O L E N O I D .
• IGNITION " O N " ENGINE S T O P P E D .
© DIAGNOSTIC TERMINAL NOT GROUNDED .
• APPLY V A C U U M .
• OSBSERVE EGR V A L V E .
© VALVE SHOULD NOT MOVE .
VALVE DOES NOT MOVE
©
e GROUND DIAGNOSTIC TERMINAL .
® REPEAT T E S T .
©
VALVE MOVES
~"1
VALVE DOES NOT MOVE
START AND IDLE ENGINE.
LIFT UP ON EGR VALVE AND
OBSERVE IDLE .
I E
REPLACE EGR
V A L V E .
IDLE ROUGHENS
©
• RECONNECT EGR SOLENOID .
• CONNECT VACUUM GAGE TO VACUUM
HARNESS AT EGR VALVE ,
® ENGINE AT NORMAL OPERATING TEMP.
• IN DRIVE (AUTOMATIC TRANS.)
• HOLD BRAKES AND ACCELERATE
MOMENTARILY UP TO ABOUT 1800 RPM.
® OBSERVE GAGE
•
SHOULD HAVE OVER 2" VACUUM BUT
LESS THAN 10"
OK
IE
NOT OK
NO TROUBLE
FOUND.
EGR S Y S T E M OK
CHART C-7
EXHAUST GAS RECIRCULATION
(EGR) CHECK
2.8L "P" SERIES (PORT)
VALVE MOVES
ri:::::::::::
• DISCONNECT EGR SOLENOID
ELECTRICAL CONNECTOR.
• REPEAT T E S T .
VALVE MOVES
I
VALVE DOES NOT MOVE
REPLACE
S O L E N O I D .
NO CHANGE
u
1
I
CHECK CKT 435 FOR SHORT TO
G R O U N D . IF NOT SHORTED IT
IS A FAULTY ECM . REFER T O
ECM Q U A D DRIVER CHECK
(CHART C-1).
REMOVE EGR VALVE .
CHECK PASSAGES FOR BEING P L U G G E D .
IF NOT PLUGGED, REPLACE EGR VALVE .
OVER 10" VACUUM
_ w _ :
R E P L A C E E G R
FILTER.
NO VACUUM OR
LESS THAN 2 "
I I I
IF THERE ARE NO RESTRICTIONS
IN VACUUM LINES , PERFORM
P/N SWITCH C H E C K . CHART C-
1A A / T O N L Y .
CLEAR CODES AND CONFIRM " C L O S E D L O O P " OPERATION AND NO "SERVICE ENGINE S O O N " LIGHT.
7-7-87
8 S 4 6 5 1 - 6 E