How to replace a spark plug on GMC Sierra 3500 Classic?

The first step to Spark Plug replacement begins with removing the wire by turning the boot half a turn before gently pulling the boot from the Spark Plug to break the connection. Before taking out the Spark Plug you should vacuum or brush off all soil in the area. Each new Spark Plug requires a dedicated tray which should bear the labeling for its destination cylinder number. During Spark Plug installation the washer needs proper positioning followed by a suitable check of the plug gap with necessary adjustments made. Begin with hand-starting the Spark Plug into its designated cylinder slot before fastening it to 15 n.m (11 lb ft). Reinstall the Spark Plug wire before checking the seating of each boot by gently pushing sideways. Replace any loose boot when necessary.

OEM GMC Sierra 3500 Classic Spark Plug

Ignition Spark Plug

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GMC Sierra 3500 Classic Glow Plug Part Number: 12639701
$25.20 MSRP: $45.00
You Save: $19.80 (44%)
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Product Specifications
- Other Name: Glow Plug, Glow; Diesel Glow Plug; Glow Plug, Spark Ignition
- Replaces: 97364968
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007 GMC Sierra 3500 Classic | SL, SLE, SLT, WT | 8 Cyl 6.0 L GAS, 8 Cyl 6.6 L DIESEL, 8 Cyl 8.1 L GAS

GMC Sierra 3500 Classic Spark Plug

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GMC Sierra 3500 Classic Spark Plug Parts Questions & Experts Answers

Glow Plug
12639701
Q: How to replace a spark plug on GMC Sierra 3500 Classic?
A:
The first step to Spark Plug replacement begins with removing the wire by turning the boot half a turn before gently pulling the boot from the Spark Plug to break the connection. Before taking out the Spark Plug you should vacuum or brush off all soil in the area. Each new Spark Plug requires a dedicated tray which should bear the labeling for its destination cylinder number. During Spark Plug installation the washer needs proper positioning followed by a suitable check of the plug gap with necessary adjustments made. Begin with hand-starting the Spark Plug into its designated cylinder slot before fastening it to 15 n.m (11 lb ft). Reinstall the Spark Plug wire before checking the seating of each boot by gently pushing sideways. Replace any loose boot when necessary.