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Home >> Chevrolet >> 1985 >> Impala 5.0 H >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - Dual Unit TBI >> Trouble Shooting >> Surging

Trouble Shooting: Surging

  1. Ensure customer understands Transmission Converter Clutch (TCC) and A/C compressor operation. Perform trouble shooting preliminary check. Check alternator output voltage, repair alternator if output is less than 9 volts or if output is greater than 16 volts.
  2. If ALDL tool is available, check that VSS reading matches vehicle speedometer. Check for intermittent EGR at idle using CHART C-7 or CHART C-7a. See COMPUTER COMMAND CONTROL SYSTEM in ENGINE PERFORMANCE section. Check for plugged EGR filter.
  3. Check for proper operation of ESC using CHART C-5. See COMPUTER COMMAND CONTROL SYSTEM in ENGINE PERFORMANCE section. Check ignition timing. Check in-line fuel filter and replace if necessary.
  4. Check fuel pressure using CHART A-7 in this article. Check oxygen sensor for silicon contamination from fuel, or use of improper RTV sealant. Oxygen sensor may have a White, powdery coating resulting in a high but false signal voltage (Rich exhaust indication). This will cause the ECM to reduce fuel delivery to engine, causing surging problem.
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