DIAGNOSIS AND TESTING - INTAKE
MANIFOLD LEAKS
An intake manifold air leak is characterized by
lower than normal manifold vacuum. Also, one or
more cylinders may not be functioning.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS OR THE FAN.
DO NOT WEAR LOOSE CLOTHING.
(1) Start the engine.
(2) Spray a small stream of water (Spray Bottle) at
the suspected leak area.
(3) If engine RPM’S change, the area of the sus-
pected leak has been found.
(4) Repair as required.
INTAKE MANIFOLD - UPPER
REMOVAL
(1) Disconnect negative cable from remote jumper
terminal.
(2) Disconnect the Inlet Air Temperature (IAT)
Sensor connector. Remove air cleaner housing and
inlet hose (Fig. 121).
(3) Remove throttle and speed control cables from
throttle arm and bracket (Refer to 14 - FUEL SYS-
TEM/FUEL INJECTION/THROTTLE CONTROL
CABLE - REMOVAL).
(4) Disconnect electrical connectors from the fol-
lowing sensors and actuators:
• Short Runner Valve (SRV)(If Equipped)
• Manifold Tuning Valve (MTV)(If Equipped)
• Throttle Position Sensor (TPS)
• Idle Air Control (IAC)
Fig. 120 LOWER INTAKE MANIFOLD
1 - BOLT 6 - GASKET
2 - HEATER SUPPLY TUBE 7 - BOLT
3 - BOLT 8 - O-RING
4 - BOLT 9 - INTAKE MANIFOLD-LOWER
5 - KNOCK SENSOR
LH ENGINE 3.5L 9 - 159
INTAKE MANIFOLD (Continued)
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