Hombre S Regular Cab 4WD V6-4.3L (1999)
Check for high fuel pressure, leaking or sticking injector. Silicone contaminated HO2S scan voltage will be slow to respond.
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Throttle Body - Remove IAC valve and inspect bore for foreign material.
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IAC Valve Electrical Connections - IAC valve connections should be carefully checked for proper contact.
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Crankcase Ventilation Valve - An incorrect or faulty crankcase ventilation valve may result in an incorrect idle speed.
Refer to Rough, Unstable, or Incorrect Idle, Stalling.
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A/C Compressor - Refer to A/C Compressor Control Circuit Diagnosis if circuit is shorted to ground. If the relay is faulty, an idle problem may
exist.
Refer to Rough, Unstable, or Incorrect Idle, Stalling.
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If intermittent poor driveability or idle symptoms are resolved by disconnecting the IAC, carefully recheck connections, valve terminal resistance
or replace IAC.
An intermittent may be caused by any of the following conditions:
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A poor connection
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Rubbed through wire insulation
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A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint Refer to Intermittents and Poor Connections Diagnosis.
If a repair is necessary, then refer to Wiring Repairs or Connector Repairs.
Step 1
