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Home >> Oldsmobile >> 1985 >> Calais Base, 2.5 U, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - PFI >> Trouble Shooting >> Rough, Unstable Idle

Rough, Unstable Idle

  1. Check throttle linkage for sticking. Check idle speed. Check IAC system. See Idle Air Control Test chart. Check alternator output voltage. Repair if less than 9 volts or more than 16 volts.
  2. Check injector balance. See Injector Balance Check chart. On all 3.8L V6 engines, check EGR. There should be no EGR at idle.
  3. On all engines, inspect O2 sensor for silicon contamination from fuel or improper use of RTV sealant. Sensor is defective if it is coated with a white, powdery coating.
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