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Home >> Oldsmobile >> 1986 >> Toronado >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - PFI >> Diagnostic Testing >> Rough, Unstable Idle
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Rough, Unstable Idle

  1. Check throttle linkage for sticking. Check idle speed. Check IAC system. See IDLE AIR CONTROL TEST chart. See Figure . Check alternator output voltage. Repair if less than 9 or more than 16 volts.
  2. Check injector balance. See INJECTOR BALANCE TEST chart. See Figure . Check EGR system. There should be no EGR at idle. Check fuel pressure regulator operation. See appropriate article in COMPUTERIZED ENGINE CONTROLS. Check ignition system.
  3. Disconnect MAF sensor. If condition persists, replace sensor. Check park or neutral and power steering pressure switches for proper operation. 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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