Engine For 2002 Trailblazer


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The engine for a 2002 Trailblazer‍ is a powerful and reliable machine that provides the necessary⁢ power to propel this SUV through various terrains. It is designed to offer a balance between performance and fuel‍ efficiency, making it suitable for‍ both ‍city driving ​and off-road adventures.

The engine for the 2002 Trailblazer is a 4.2-liter ​inline six-cylinder engine. This engine ‍is known⁣ for its durability and smooth performance. It has a​ robust power output of around 275 horsepower and 275 lb-ft of ‍torque, allowing the Trailblazer to accelerate swiftly⁢ on highways and climb steep hills effortlessly.

One of the notable features of this engine is its‍ variable valve ‍timing (VVT) technology. This system optimizes the opening and closing of ⁣the engine valves, resulting in improved fuel efficiency and enhanced power delivery. ‌It also helps to

Product Description for Engine For 2002 Trailblazer

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Product Description



Automotive-leader Brand

Our have own professional R&D design team dedicated to creating quality products, providing customers with affordable products and a good shopping experience. Automotive-leader Brand’s products are 100% brand new aftermarket products.The Automotive-leader brand has cooperated with many foreign factories and directly purchased the original chips. After the development and processing by domestic professional teams, accuracy meet the professional specification as OEM standard, making it easy to installation & direct plug-in replacement and use high temperature corrosion resistant materials can extend the life of the product.



Replace Part Number :

25317671, M883
FJ319, 4G1661


Please confirm the part number and your vehicle information (e.g Year, Make, Model) & Engine Fit Product Description before placing an order.

Vehicle Compatible

2004 Buick Rainier 4.2L-l6

2002-2004 Chevrolet Trailblazer 4.2L-l6

2002-2004 GMC Envoy 4.2L-l6

2003-2004 Isuzu Ascender 4.2L-l6

2002-2004 Oldsmobile Bravada 4.2L-l6

Package Content :

Pack of 6Pcs 25313185 fuel injectors

25313185 Fuel Injector Specifications

Color :

Fuel Injector Type :
MFI Injector

Fuel Type :

New or Reman :

O-rings included :

System Type :
Top Feed

Terminal Gender :

Terminal Quantity :

Terminal Type :

Orifice Type :
4 holes disc

O.E.M. Replacement :

Injector Design :
Metal composite plastic

Filter Design :
Basket filter design at inlet

Fuel Injector

Fuel Injector

The working principle of the gasoline injector !

The fuel injection nozzle is a simple solenoid valve. When the solenoid coil is energized, suction is generated. The needle valve is sucked up and the injection hole is opened. The fuel is ejected at high speed through the annular gap between the needle and the injection hole on the needle valve head. Mist, good for full combustion.

Fuel Injector

Fuel Injector

What are symptoms of a problematic injector ?

Check Engine Light/Misfiring engine caused by a change in the injector’s flow
Noticeable fuel odor caused by leaky injector
Reduced gas mileage caused by an incorrect injector spray pattern
Inconsistent engine idling, hesitation or stalling caused by dirty injectors due to low quality fuel
Check Engine Light (CEL);Starting Issues;Bad fuel economy;Engine RPM/ Performance issues

Fuel Injector

Fuel Injector

Should you replace all injectors at once ?

If an injector is faulty on a vehicle with high mileage chances are the remaining injectors are in a similar condition, or will be in the near future. Replacing your injectors as a set ensures each cylinder is receiving the same amount of fuel leading to better performance and improved fuel economy. Since the time required to replace a single injector is about the same as replacing all the injectors it is recommended to replace them as a set.

Fuel Injector

Fuel Injector

Installation instructions for fuel injectors

First disconnect the plug from the injector. Then disconnect the vacuum tube and fuel return tube from the fuel pressure regulator, and then disconnect the fuel hose from the distributor.
Remove the retaining nuts on the distributor and harness rack.
Remove the distributor ,then remove the injector from the distributor
First insert the injector into the distributor. Then attention should be paid to applying a clean oil layer to the new seal ring and then pressing the fuel injectors into the intake manifold .(Pay attention to the damage of the 0-ring,and the injector should be installed on the distributor first, and then on the intake manifold)
Replace the fuel hose with a new washer and connect it to the distributor. Then connect the plug on the injector and harness, and connect the vacuum hose and return pipe to the fuel pressure regulator. And then install intake manifold and intake manifold cover.

Fuel Injector

Fuel Injector

Fuel Injector

Fuel Injector

Fuel Injector

Fuel Injector

Fuel Injector

Fuel Injector

Diagnose Fuel Nozzle Injector Faults and Resolve Faults









Fuel Injection Hole Blockage

The needle can be used for dredging, and it should be carefully cleaned after dredging.

Poor Sealing of Needle Valve and Needle Valve Body, Resulting in Poor Atomization or Dripping of the Injector

This kind of failure can be applied to the sealing tape at the end of the needle valve with fine chrome oxide or toothpaste, but never put it on the cylindrical part, then insert the needle valve into the needle valve body and knock it until it closes.
The chromium oxide or toothpaste must be washed away after grinding.

Air in the Oil Circuit

Simply remove the air from the oil circuit.

Poor Oil Supply

Repair the oil pump. If the oil pipe joint leaks, try to connect it so that it does not leak.

Insufficient Spring Force of the Piston Spring or Spring Break

Replace the spring.

Piston Wear, Affecting Oil Supply

Replace the piston.

OE Part Number
23209-62040, M717, 4G1597, 1580561, FJ585
23250-0H030, 23250-0H060, 842-12303
M1410, 2173412, 4G2252, FJ10736
16450-RDA-A01, 16450-RCA-A01, FJ485, 4G1709
12632255,12611545, 4G2259, M1209

Direct Fit Application

Pin Count

Orifice Type
2 Hole Disc
6 Hole Disc
12 Hole Disc
4 Hole Disc
8 Hole Disc
6 Hole Disc

Pre-Installed O-rings

Package Quantity

【Feature】▲2-pin Count ▲4 Holes Disc Engine ▲Fast response ▲Stable performance and durable ▲Made of High robust metal and composite plastic, improve your pre-installed O-rings ▲Not easy cracking, ultra durable for long time use.
【Direct Fit Application】25313185 fuel injector replacement for 2004 Buick Rainier 4.2L-l6, for 2002-2004 Chevro-let Trailblazer 4.2L-l6, for 2002-2004 GMC Envoy 4.2L-l6, for 2003-2004 Isuzu Ascender 4.2L-l6, for 2002-2004 Oldsmobile Bravada 4.2L-l6
【Interchange Part Number】25313185, 17113794, 12569573, FJ10578, 19244623, 832-11178, 25317671, FJ319, 4G1661, M883
【Service Guaranted】100% must pass a rigorous professional practice loading test before sale and shipment. Please rest assured to purchase. If you have any questions, contact with us, we will reply you in 24 hours and offer the solve way for you.



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