OEM Chevrolet Astro Spark Plug

Chevrolet Astro Spark Plug Parts Questions & Experts Answers

• Spark Plug
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  Q: How to ensure optimal performance by verifying the correct spark plug installation and inspecting its components on Chevrolet Astro?

  A: Refer to ignition system specifications to obtain proper Spark Plug information before confirming installation because a mismatched Spark Plug might damage the driveability performance. It is important to verify that the Spark Plug heat range matches the correct specifications because both incorrect temperature settings can cause fouling or pre-ignition conditions leading to engine damage. Check the terminal post for all signs of damage while making sure it stays fixed in place by twisting and pulling. Also inspect for any potential bending or breaking of the post. Check the insulator for electric charge path abnormalities that result from terminal post-to-ground electrical connections and examine both the Spark Plug boot and Cylinder Head recess area to detect moisture which can lead to arcing. Examine the insulator region for open areas which potentially enable electrical charge arcing instead of electrode contact (3, 4). The operational efficiency of the Spark Plug is determined by the correct measurement of the center electrode-side electrode distance and correct torque adjustment based on ignition system specifications to prevent operation issues. The insulator tip must be checked for tracking indications while side electrode wear and breakage and center electrode looseness and damage are assessed through a rattling sound. Check for electrode bridges (3, 4) because of accumulated deposits and examine platinum pads on electrodes (3, 4) for wear symptoms when such pads exist and assess excessive fouling amounts. Ending the examination by checking the Cylinder Head Spark Plug recess area for debris since damaged threads or contaminants can lock the plug in place during installation. The correct color of normal operation is brown to greyish-tan and indicates small white powdery deposits, but carbon fouling shows up as dry black flaky carbon which stems from rich fuel mixtures, leaking fuel injectors, excessive fuel pressure and restricted air filters and incorrect combustion conditions. Additional carbon fouling sources include weak ignition coils alongside broken ignition wires and improper Spark Plug gaps and prolonged engine idling and driving periods under low power demands. The spark intensity decreases when deposits resulting from oil or coolant or particular additives form glaze on electrodes.