Pontiac Fiero 1988 Service Manual page 600

DRIVEABILITY AND EMISSIONS - FUEL INJECTION (PORT) SE3-A-17
I . . . . . . . .
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Q S B
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• NOTICE- EFI SYSTEM UNDER PRESSURE. TO
I A VOID FUEL SPILLAGE, REFER TO FIELD I
• SERVICE PROCEDURES FOR
TESTING
OR
I MAKING REPAIRS REQUIRING DISASSEMBL Y
I
• OF FUEL LINES OR FITTINGS.
• . . . i
CHART A-7
(Page 1 of 4)
FUEL SYSTEM DIAGNOSIS
2.8L "P" SERIES (PORT)
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• INSTALL FUEL PRESSURE G A G E , J-34730-1 OR EQUIVALENT
• IGNITION " O F F " FOR 10 SECONDS. A/C " O F F " .
• IGNITION " O N " . FUEL PUMP SHOULD RUN FOR ABOUT 2 SECONDS.
• NOTE : FUEL PRESSURE WITH PUMP RUNNING SHOULD BE 280-325
KPA (40.5 - 47 PSI) AND HOLD STEADY.
• NOTE: THE IGNITION MAY HAVE TO BE CYCLED ON MORE THAN ONCE
TO OBTAIN THIS PRESSURE. ALSO IT IS NORMAL FOR THE PRESSURE
TO DROP SLIGHTLY WHEN THE PUMP STOPS. * *
IF CONTINUING .
FROM CHART A-3 1
(1of2) START AT I
THIS POINT ON |
CHART. „
©
OK
START AND IDLE ENGINE AT
NORMAL OPERATING TEMP.
PRESSURE SHOULD BE
LOWER BY 21-69 KPA
(3-10 PSI).
OK
m
NO TROUBLE
FOUND. REVIEW
SYMPTOMS
SECTION " B " .
OK
H
REPAIR
VACUUM
SOURCE T O
REGULATOR
©
NOT OK
APPLY 10 INCHES
OF VACUUM TO
PRESSURE
REGULATOR.
FUEL PRESSURE
SHOULD DROP
21-69 KPa (3-10
PSI).
NOT OK
REPLACE
REGULATOR
ASSEMBLY
NOT OK
PRESSURE BUT
NOT HOLDING
PRESSURE BUT
LESSTHAN 280
KPA(40 PSI).
IGNITION " O F F " FOR 10
SECONDS.
IGNITION " O N "
BLOCK FUEL PRESSURE
LINE BY PINCHING FLEX
HOSE, PRESSURE
SHOULD HOLD.
ABOVE 325
KPA (47 PSI).
NO PRESSURE
S E E
C H A R T A 7
( P A G E 4 O F 4)
SEE
CHARTA-7
( P A G E 2 O F 4)
NOT HOLDING
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——^|
• BLOCK FUEL RETURN
LINE BY PINCHING
HOSE.
• RECHECK PRESSURE.
HOLDS
1 _
FAULTY FUEL
PRESSURE
REGULATOR
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HOLDS
C H E C K :
• LEAKING PUMP
COUPLING HOSE OR
PULSATOR LEAKING.
• FAULTY IN-TANK PUMP.
NOT HOLDING
i _ _ Z Z
LOCATE AND CORRECT
LEAKING INJECTOR., ALSO
CHECK COLD START VALVE
7-7-87
5 S 1 9 0 1 - 6 E