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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Troubleshooting - No Codes - 3.1L >> Symptoms >> Cuts Out, Misses >> Additional Checks

Additional Checks

  1. Check the exhaust system for possible restrictions:
    • Check the exhaust system for damaged or collapsed pipes.
    • Check the mufflers for heat distress or possible internal failure.
    • Check for possible catalytic converter restrictions by testing the exhaust system back pressure.

      See EXHAUST SYSTEM CHECK under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - 3.1L CENTURY, GRAND PRIX & MALIBU article.

  2. An engine miss condition can be caused by Electromagnetic Interference (EMI) on the reference circuit. EMI can usually be detected by monitoring engine RPM with a scan tool. A sudden increase in RPM with little change in actual engine speed indicates EMI is present. If a condition exists, check the routing of secondary ignition wires, or high voltage components near the ignition control circuits.
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