Initial Inspection and Diagnostic Overview

Fig. 3 Spark Plug Cables:

NOTE: Resistance cables are identified by the words Electronic Suppression.

Spark plug cables are sometimes referred to as secondary ignition wires.
- The wires transfer electrical current from the coil pack to individual spark plugs at each cylinder.
- The resistor type, nonmetallic spark plug cables provide suppression of radio frequency emissions from the ignition system.

CHECKING
Check for brittle or cracked insulation.

Check the spark plug cable connections for good contact at the coil and spark plugs.
- Terminals should be fully seated.
- The nipples and spark plug covers should be in good condition.
- Nipples should fit tightly on the coil.
- Spark plug boot should completely cover the spark plug hole in the cylinder head cover.

Install the boot until the terminal snaps over the spark plug.
- A snap must be felt to ensure the spark plug cable terminal engaged the spark plug.
- Loose cable connections will corrode, increase resistance and permit water to enter the towers.
- These conditions can cause ignition malfunction.


Be sure that dual plastic clip holds #1, #2 cables off of valve cover and that PCV hose plastic clip holds #3 cable away from metal PCV clamp and edge of air duct.

SPARK PLUG TUBES
The spark plugs tubes are pressed into the cylinder head. Sealant is applied to the end of the tube before installation.