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Home >> Oldsmobile >> 1978 >> Starfire Base, 2.5L Eng VIN 1, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Electronic Fuel Control >> Testing & Diagnosis >> Pre-Diagnosis Checks

Pre-Diagnosis Checks

  1. Before starting any diagnostic routines, make the following general checks first: check all vacuum hoses for proper routing and connections. Check for kinked, cracked or plugged hoses. Inspect all electrical wiring for cracked, frayed or broken wires.
  2. Make sure the ignition system has proper amount of available voltage. Ensure engine is in good mechanical condition, exhaust system is clear and good quality fuel is present.
    NOTE: The ECU wiring harness may be difficult to plug into the unit. A locator clip is provided on the harness and it must be aligned with slot on ECU. Check this connection.
  1. 2) If any of the following vehicle symptoms are noticed, the Electronic Fuel Control system should be checked:
    • Detonation
    • Stalls or rough idle
    • Missing
    • Hesitation
    • Surges
    • Sluggish performance
    • Poor economy
    • Hard starting
    • Excessive exhaust odor
    • Cut outs
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