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Home >> Mercury >> 1981 >> Lynx LS, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> MCU Engine Control System >> Diagnosis & Testing >> Functional Test >> Engine Running Test (V8)

Engine Running Test (V8)

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  1. Check to see if engine has knock sensor. If so, have steel bar (socket extension) and tap hammer handy. Start engine and run at 2000 RPM for 2 minutes. Turn engine off, then immediately restart.
  2. Observe voltmeter for 4 initial pulses. As soon as pulses appear, hold steel bar against manifold near knock sensor and tap bar lightly with hammer for 15 seconds.
    NOTE: If more than 4 pulses appear, check for open circuit between coil and pin 8 of MCU module connector.
  3. Observe and record service codes. After 4 second pause, code(s) will be repeated. Stop engine and reconnect PCV valve. Refer to code chart to locate appropriate test.
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