How to replace spark plugs in an engine on Chevrolet Trailblazer?

It is essential to begin the Spark Plug replacement by first turning off the Ignition Switch and then removing the ignition coils. Wait until the engine temperature sinks to safe levels before taking out spark plugs for protecting the Cylinder Head threads from harm. Use a thread chaser to clean the Spark Plug recess area before new install while also removing any debris from the threads to prevent contamination that will affect plug seating. Replace the spark plugs by using engine-specific spark plugs exclusively because plugs with different heat levels cause severe engine deterioration. A round feeler gauge should be used to check the gap of new and reconditioned spark plugs to verify their fit specifications. A thread chaser should be utilized when installing spark plugs to achieve full seating and prevent cross-threading issues that could result in overheating or thread damage. Sticky substances and paints must be avoided on fasteners because they interfere with their clamping force while only acceptable when suppliers specify their use. Correct fasteners should be installed in designated spots using matching required part numbers. Replace the spark plugs to the engine so tighten them to 18 nm (13 lb ft). After that reinstall the ignition coils.

OEM Chevrolet Trailblazer Spark Plug

Ignition Spark Plug

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Chevrolet Trailblazer Spark Plug Part Number: 12683541
$9.41 MSRP: $16.80
You Save: $7.39 (44%)
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Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug,Glow
- Replaces: 55490097
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | L, LS, LT | 3 Cyl 1.2 L GAS
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Chevrolet Trailblazer Spark Plug Part Number: 12681663
$9.22 MSRP: $16.46
You Save: $7.24 (44%)
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Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug, Spark Ignition; Spark Plug,Glow
- Replaces: 12598004, 12625058
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2009 Chevrolet Trailblazer | Base, LS, LT, North Face | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer Spark Plug Part Number: 12688094
$10.33 MSRP: $18.44
You Save: $8.11 (44%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Spark Plug Assembly-Gasoline Engine Ignition; Spark Plug, Spark Ignition; Spark Plug,Glow
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | ACTIV, LS, LT, RS | 3 Cyl 1.3 L GAS
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Chevrolet Trailblazer Spark Plug Part Number: 25334145
Product Specifications
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2003 Chevrolet Trailblazer | LS, LT, LTZ, North Face | 6 Cyl 4.2 L GAS

Chevrolet Trailblazer Spark Plug

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The Spark Plug in Chevrolet Trailblazer is very important since it ignites the mixture of fuel and air that are required to combust in an automobile. It produces a spark that transmits an electric current from the ignition system into the combustion chamber with the aim of burning the fuel/air mixture. This consequently impacts on power, fuel consumption, and emissions which categorize Spark Plug as a vital element for the performance of the vehicle. There are different models of the Spark Plugs that have been used in Chevrolet Trailblazer and depending on the type of the engines, different type of Spark Plug with different design and material have been used. Some of the differences include more than one ground electrode and the surface-discharge plugs that helps in getting better ignition and longer life of the spark plugs. Proper servicing and frequent substitution of Spark Plugs are essential because the deterioration of the later may result in misfire and other engine problems. Other important factors relating to the efficacious and durability of Spark Plug in Chevrolet Trailblazer includes the gap sizes as well as the heat range.

Chevrolet Trailblazer Spark Plug Parts Questions & Experts Answers

Spark Plug
25334145
Q: How to replace spark plugs in an engine on Chevrolet Trailblazer?
A:
It is essential to begin the Spark Plug replacement by first turning off the Ignition Switch and then removing the Ignition Coils. Wait until the engine temperature sinks to safe levels before taking out spark plugs for protecting the Cylinder Head threads from harm. Use a thread chaser to clean the Spark Plug recess area before new install while also removing any debris from the threads to prevent contamination that will affect plug seating. Replace the spark plugs by using engine-specific spark plugs exclusively because plugs with different heat levels cause severe engine deterioration. A round feeler gauge should be used to check the gap of new and reconditioned spark plugs to verify their fit specifications. A thread chaser should be utilized when installing spark plugs to achieve full seating and prevent cross-threading issues that could result in overheating or thread damage. Sticky substances and paints must be avoided on fasteners because they interfere with their clamping force while only acceptable when suppliers specify their use. Correct fasteners should be installed in designated spots using matching required part numbers. Replace the spark plugs to the engine so tighten them to 18 nm (13 lb ft). After that reinstall the ignition coils.