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Trouble Shooting: Surging

  1. Check EGR valve operation. See CHART C-7 (2.8L and 4.3L ) or CHART C-7A (2.5L) in GENERAL MOTORS COMPUTER COMMAND CONTROL article in COMPUTERIZED ENGINE CONTROL section.
  2. Check ignition timing. Check fuel filter for restrictions. Check fuel pressure. Check alternator output voltage. Repair if less than 9 volts or more than 16 volts.
  3. Remove and inspect oxygen sensor for silicon contamination from fuel, or improper use of RTV sealant. Sensor may have a White powdery coating, and will result in a high, but false, signal voltage (rich exhaust indication). Check ignition system.
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