Lebaron Sedan V6-181 2972cc 3.0L SOHC VIN 3 MFI (1994)
Throttle Body: Testing and Inspection
Minimum Air Flow Air Metering Fitting
WARNING: Apply parking brake and/or block wheels before performing any engine running test with the vehicle on the ground.
PRELIMINARY CHECK
1. With vehicle in PARK (A/T) or NEUTRAL (M/T), START the engine, turn all accessories off, and allow engine to run until the cooling fan cycles
at least once.
2. Remove intake air hose from throttle body.
3. Cover Idle Air Control by pass passage with finger.
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If engine dies, clean throttle body and retest. SEE MAINTENANCE PROCEDURES.
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If engine does not die, proceed with Minimum Air Flow Test.
PREPARATIONS
1. Remove air cleaner, and plug heated air door vacuum hose.
2. With vehicle in PARK (A/T) or NEUTRAL (M/T), START the engine, turn all accessories off, and allow engine to run until the cooling fan cycles
at least once.
3. Shut OFF engine. Connect scan tool, timing light and tachometer.
4. Adjust basic timing. SEE IGNITION SYSTEM/ADJUSTMENTS.
Idle Purge Hose
PROCEDURE
1. Disconnect PCV valve and plug PCV valve nipple.
2. Disconnect the idle purge hose from vacuum tube under the intake manifold.
3. Install metered orifice no. C-5004 (or equivalent 0.125 inch orifice) in the idle purge hose.
4. START engine and allow to idle for at least one minute.
5. Using scan tool [1], access MINIMUM AIRFLOW IDLE SPEED TEST.
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The Idle Air Control (IAC) motor should close the bypass passage fully.
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Idle spark advance should become fixed.
6. Compare idle speed to specifications below.
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If idle rpm is within range, Minimum Air Flow is set correctly.