Section04ENGINEMANAGEMENT(15034-TEC)
Subsection 03 (COMPONENT INSPECTION, REPLACEMENT AND ADJUSTMENT)
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R1503motr160A
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4
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2
TYPICAL
1. Throttle body
2. Throttle cable attachment
3. Throttle plate
4. TPS
5. Idle bypass channel
6. Idle bypass valve
Mechanical Inspection
Check that the throttle plate moves freely and
smoothly when depressing throttle lever. Take
this opportunity to lubricate the throttle cable.
IMPORTANT: The throttle body is designed to be
tamper proof. Changing the idle stop or modify-
ing it in any way will not increase performance or
change the idle speed but may cause poor starta-
bility and erratic idling.
Before replacing any part, check the following as
these could be causing the fault. Perform the test
while the engine is not running.
– Throttle cable adjustment too tight. Not return-
ing fully to idle stop.
– Throttle body idle set screw is loose or worn.
– TPS is loose.
– Idle bypass valve is loose.
– Corroded or damaged wiring or connectors.
– Throttle body has been replaced and the Closed
Throttle and Idle Actuator reset has not been
performed.
– ECM has been replaced and the Closed Throt-
tle and Idle Actuator reset has not been per-
formed.
Electrical Inspection
Refer to THROTTLE POSITION SENSOR (TPS)
and IDLE BYPASS VALVE further in this section.
Replacement
Removal
To remove the throttle body from engine, proceed
as follows:
– Disconnect air intake silencer from throttle
body. Move boot away.
– Remove retaining screws of throttle body.
R1503motr205A
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4-TEC NATURALLY ASPIRATED MODELS
1. Throttle body
2. Screws
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R1503motr269A
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ALL 4-TEC SUPERCHARGED MODELS
1. Throttle body
2. Screws
– Slightly pull throttle body out.
– Disconnect connectors from idle bypass valve,
and TPS.
– Disconnect throttle cable.
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