OEM 2004 Buick Regal Spark Plug

2004 Buick Regal Parts Questions & Experts Answers

• Q: How to ensure the correct spark plug is installed and functioning properly to avoid driveability issues on 2004 Buick Regal?

  A: Check the Spark Plug type installation to avoid driving problems and ensure the plug heat range matches the engine requirements to stop fouling due to cold plugs or overheating from hot plugs. Twisting and pulling the terminal post will reveal any damage or bending or looseness. A secure attachment should remain in place. Electrical charges will arc through any cracks found on the insulator since they bypass the electrodes (3, 4). The Spark Plug boot system should be evaluated for any sign of damage while the recess area of the Cylinder Head should be checked for water or oil or coolant residue. Check the distance between the center electrode and the side electrode to guarantee the operational specification range because wide gaps create operation limitations. Correct Spark Plug torque must be verified since weak torque will generate operational problems but excessive torque may break the insulator. Examine tracking indications near the insulator tip while checking side electrode wear along with center electrode looseness or damage through its associated rattling sound. The inspection should include testing for electrode (3, 4) deposits which might reduce the gap or eliminate it completely and examining electrodes (3, 4) for platinum pad wear or absence when pads are used. Also inspect the Spark Plug recess area for any damaged or dirty threads because improper seating issues during installation can occur. Numerically controlled operation generates a brown to grayish-tan color and light white powdery deposits during normal operation, yet carbon fouling produces dry, fluffy black carbon when operating with rich fuel mixtures, leaking fuel injectors and excessive fuel pressure, blocked air filters, improper combustion, weak ignition voltage, weak coils or worn ignition wires or incorrect Spark Plug gaps and excessive idling-periods. Deposits originating from oil and coolant along with additives create spark intensity reduction through their formation of electrode-glazing films.