Trouble Shooting: Surging
- Check EGR valve operation. See appropriate EGR SYSTEM CHECK chart in GENERAL MOTORS COMPUTER COMMAND CONTROL article in COMPUTERIZED ENGINE CONTROLS section.
- Check ignition timing. Check fuel filter for restrictions. Check fuel pressure. See FUEL SYSTEM PRESSURE TEST . Check alternator output voltage. Repair alternator if output voltage is less than 9 volts or more than 16 volts.
- Check Torque Converter Clutch (TCC) operation. See appropriate TORQUE CONVERTER CLUTCH ELECTRICAL DIAGNOSIS chart in GENERAL MOTORS COMPUTER COMMAND CONTROL article in COMPUTERIZED ENGINE CONTROLS section.
- 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.