GM Service Manual Online
For 1990-2009 cars only

Tools Required

J 39200 Digital Multimeter

  1. Check the routing of the wires. Improper routing can cause crossfiring.
  2. Check each wire for any signs of cracks or splits in the wire.
  3. Inspect each boot for signs of tears, piercing, arc through, or carbon tracking. If the boot needs to be replaced, twist it a half turn in either direction to break the seal before pulling on the boot in order to remove the wire.