Pontiac Fiero 1984-1988 Repair Guide

Spark Plug Cables

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INSPECTION



Visually inspect the spark plug cables for burns, cuts, or breaks in the insulation. Check the spark plug boots and the nipples on the distributor cap and coil. Replace any damaged cables. If no physical damage is obvious, the cables can be checked with an ohmmeter for excessive resistance.

REMOVAL & INSTALLATION





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Fig. Fig. 1 Checking plug wire resistance through the distributor cap with an ohmmeter



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Fig. Fig. 2 Checking individual plug wire resistance with a digital ohmmeter



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Fig. Fig. 3 Mark the spark plug wire and its position on the distributor cap ...



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Fig. Fig. 4 ... then remove the wires from the distributor tower and the spark plug

When installing a new set of spark plug cables, replace the cables one at a time so there will be no mix-up. Start by replacing the longest cable first. Install the boot firmly over the spark plug. Route the wire exactly the same as the original. Insert the nipple firmly into the tower on the distributor cap. Repeat the process for each cable.

 
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