How to Replace the Spark Plugs in a GMC Safari 4.3L V6

by Ryan Long
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spark-plug wrench image by Aleksandr Ugorenkov from

Changing the spark plugs on the GMC 4.3L V6 can be a tricky job and requires the removal of the front tires to get to all of the spark plugs. If you have the right tools changing the plugs yourself can be a simple procedure if you're not afraid of getting in there and getting your hands dirty. This procedure applies to several variations of the GMC 4.3L V6 and the engines it has descended from since the first V6 introduced in 1978.

Spark Plugs

Step 1

Loosen all lugnuts on the wheel but do not remove the wheel.

Step 2

Jack the GMC Safari up on the front driver's side. Set jack stands to support vehicle weight and remove the jack.

Step 3

Use the tire iron to remove the lugs. Keep lugs in safe place where they will not get lost and the internal threads will not get dirty. Remove the tire and set flat on the ground.

Step 4

Remove the rubber flap over the ball joint to access the underside of the engine block. Slide the spark plug socket over the first spark plug and turn counterclockwise until the spark plug loosens. Remove the spark plug. Gently remove wiring. Repeat the procedure for all spark plugs on the driver's side.

Step 5

Attach wiring to new spark plugs or replace wiring. Insert new spark plugs. Use the ratchet to tighten the spark plugs by turning clockwise. Do not over tighten.

Step 6

Put the tire back on and tighten the lugnuts down with your fingers then with the tire iron. Be careful not to rock the vehicle off the jack stand when tightening the lugnuts. Jack the vehicle up above the jack stand. Remove the jack stand and lower the vehicle to the ground. Remove the jack. Tighten the lug nuts while the vehicle is firmly on the ground.

Step 7

Repeat this procedure on the passenger side. Remove two screws on the oil dipstick to access the middle plug. Dispose of old the spark plug appropriately and double check security of the lugnuts.

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