Ignition Coil and plug wire Inspection GM engines
This is what the coil towers should look like.
A common reason for missfires, hesitation, and
stumble is a corroded ignition coil and/or plug wire.
This example is from a 3.1 / 3.4 litre engine.
1- Burned / corroded coil tower
2- Burned / corroded plug wire
This can cause misfires under hard acceleration, or
when cruising at a steady speed (45-65 mph) then
accelerating to pass. Also will missfire at idle on
wet, damp mornings. Causes a code p0300.
stumble is a corroded ignition coil and/or plug wire.
This example is from a 3.1 / 3.4 litre engine.
1- Burned / corroded coil tower
2- Burned / corroded plug wire
This can cause misfires under hard acceleration, or
when cruising at a steady speed (45-65 mph) then
accelerating to pass. Also will missfire at idle on
wet, damp mornings. Causes a code p0300.
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