OEM 2002 Chevrolet Corvette Spark Plug

2002 Chevrolet Corvette Parts Questions & Experts Answers

• Q: How to verify that the correct spark plug is installed and functioning properly on 2002 Chevrolet Corvette?

  A: Driveability problems may occur if you install the wrong Spark Plug or use an improperly selected heat range Spark Plug. Check that the Spark Plug has a proper heat range because using the wrong heat will either foul from cold spark plugs or damage from hot plugs. Inspect the terminal post for damage by checking both its condition and its resistance to twisting and pulling motions because it must not move away from its position. Both flashover and carbon tracking issues in the insulator and damaged Spark Plug boots or wet recess areas of the Cylinder Head should be checked. Electrical charge between terminal post and ground leads to these issues while moisture can cause arcing problems. The insulator should be checked for any signs of damage that could allow electric charge to arcing through the gaps instead of reaching the electrodes (3, 4). A proper gap reading between the center electrode (3) and the side electrode (4) needs to be measured to prevent operational issues caused by an inappropriate gap width. The Spark Plug torque needs verification because inadequate torque can damage the system but excessive torque may lead to insulator breakdown. Ensure that tracking points do not exist near the insulator tip then examine the side electrode for damages and the center electrode for indicators of looseness or damage which produce a rattling sound when shaken. Inspect the electrodes (3, 4) for bridged connection (3, 4) caused by deposits that might eliminate the gap and investigate electrode (3, 4) platinum pads for wear or absence. The test procedure includes two inspections: first verifies the Spark Plug recess area of the Cylinder Head remains free of debris while checking secondly that the threads in this area are not damaged because damaged threads prevent proper seating. The standard operating condition produces brown-gray tannish colors interspersed with minimal white powder deposits yet carbon fouling manifests itself as light black dry carbon deposits which stem from fuel-rich mixtures, leaky fuel injectors, high pressure fuel delivery and blocked air filters alongside incorrect combustion processes and reduced ignition system voltage as well as weak coils, frayed ignition wires, and improper Spark Plug gaps. The burning off of normal combustion deposits fails because of both engine idling beyond limits and slow speeds. On the other hand deposit fouling that begins from oil or coolant or additive presence weakens spark intensity when it develops an electrode-glazing film.