How To Change A Fuel Injector On A Chevy Trailblazer

How to Change Fuel Injectors on a 2002 Chevy Trailblazer

past Melissa Kelly

fuel empty image by glgec from <a href='http://www.fotolia.com'>Fotolia.com</a>

The fuel injectors on your 2002 Chevy Trailblazer are role of the fuel-injection system that mixes fuel with air in the engine. Fuel-injection systems have replaced carbureted systems virtually completely since the 1980s. The injector itself is the nozzle, or valve component, that operates in conjunction with the fuel pump to deliver fuel to the engine. A bad or muddy injector can lead to poor fuel economy, a sputtering engine or weak and intermittent engine firing.

6-cylinder models

Stride i

Salvage the fuel system pressure by offset removing the fuel filler cap and so the fuel pump relay, located in the fuse box under the hood. Showtime the engine and allow it to stall, then continue to crank the engine an additional five to 10 seconds.

Pace two

Disconnect the negative battery cable from the terminal.

Step 3

Remove the intake manifold by first removing the throttle body and PCM. Disconnect the electrical harnesses from their brackets and the MAP sensor connector. Disconnect the front differential vent hose from its bracket clip. Disconnect the crankcase vent hose from its port on the manifold. Remove the engine harness bracket and alternator. Disconnect the vacuum hose from the power restriction booster so remove the intake manifold by unscrewing the bolts.

Step four

Clean the fuel runway/fuel injector expanse with degreaser. Blow the area dry with compressed air.

Footstep v

Disconnect the fuel pressure regulator vacuum line, the fuel injector harness connector and the fuel line fittings. Remove the fuel rail attaching bolts and apply gentle and even outward pressure level on the fuel rail to complimentary it from the cylinder caput.

Step six

Disconnect the electric connector from the injectors to be removed. Remove the retaining clips and remove the injectors from the fuel rail assembly. Remove and discard the O-rings and seals (two per injector).

Stride 7

Supervene upon the injector O-rings. Apply a calorie-free coat of clean engine oil to the O-rings and printing the injector into the fuel runway until seated. Install the injector retaining clips.

Step 8

Inspect the injector holes on the cylinder head and clean out if necessary. Lubricate the injector seal O-rings with clean engine oil and seat them on the injector holes. Reconnect the electrical connector to the injector.

Pace 9

Supervene upon the fuel rails assembly and tighten the mounting bolts to 89 in-lbs.

Continue with the installation in the opposite of removal. Once complete, turn the ignition switch to "On" but do not engage the starter. Cycle the ignition on and off several times to activate the fuel pump and build fuel pressure. Check the fuel lines, fuel runway and injector for leakage prior to full performance.

V8 models

Step 1

Relieve the fuel organisation pressure past commencement removing the fuel filler cap and then the fuel pump relay, located in the fuse box nether the hood. Kickoff the engine and allow information technology to stall, and so continue to crank the engine an boosted 5 to 10 seconds.

Step two

Disconnect the negative battery cable from the terminal.

Step 3

Remove the air intake duct and resonator by removing the diagonal brace and intake baffle. Loosen the captive screws and pull the housing encompass upward, and so elevator the air filter element out of the housing. Disconnect the headlamp washer hose and the electrical connectors for the windshield washer, headlamp washer, fluid level and water pump. Disconnect the forward lamp harness clips and washer fluid hose. Remove the housing mounting nuts and remove the housing.

Step iv

Disconnect any electrical connectors that will interfere with fuel runway removal. Detach the upper engine wiring harness from the retainers and position the wiring harness bated. Disconnect the accelerator cable and prowl control cablevision from the throttle body. Disassemble the cables from the bracket and position the cables bated.

Step v

Clean the fuel rail/fuel injector surface area with degreaser. Blow the area dry with compressed air.

Step 6

Disconnect the fuel injector electrical connectors by pulling the retainer up and pushing in on the tab. Tag each connector with a number that corresponds to the cylinder number. Disconnect the fuel supply and render lines from the fuel rail pipes. Disconnect the fuel vacuum line from the fuel pressure regulator.

Step 7

Remove the fuel rail mounting bolts. Loosen the crossover tube retaining screw at the passenger side of the fuel rail only practice not remove the tube. Gently rock the fuel rails and injectors to loosen the injectors. Remove the fuel track and fuel injectors as an associates.

Step 8

Remove the retaining clip and remove the injectors from the fuel track assembly with a forked tool. Remove and discard the O-rings and seals.

Stride nine

Supervene upon the injector O-rings and employ a calorie-free coat of clean engine oil. Press the injector into the fuel rail until seated. Install the injector retaining clips.

Step 10

Install the injector and fuel runway associates on the intake manifold and fully seat the injectors. Utilize a thread-locking compound to the fuel mounting bolts and tighten them to 89 in-lbs. Tighten the crossover tube retainer screw at the right fuel rail.

Pace eleven

Connect the fuel supply and return lines; verify they are securely installed. Connect the electrical connectors to each injector co-ordinate to the number as tagged.

Continue with the installation in the reverse of removal. Once complete, turn the ignition switch to "On" merely exercise not engage the starter. Cycle the ignition on and off several fourth dimension to activate the fuel pump and build fuel pressure. Check the fuel lines, fuel runway and injector for leakage prior to full operation.

References

• "Haynes Repair Transmission: Chevrolet Trailblazer and GMC Envoy"; Alan Ahlstrand, Ralph Rendina and John Haynes; 2009

Things You'll Demand

• Screwdriver
• Degreaser
• Compressed air
• Socket wrench
• Sockets
• Straight wrench
• Torque wrench
• Fuel injector
• Fuel injector O-rings
• Forked tool
• Engine oil
• Thread-locking compound

Writer Bio

Melissa Kelly is a freelance writer from Indianapolis who focuses on scientific and medical topics. Kelly attended Marian College where she obtained a Bachelor of Science degree in chemical science. Recently, she completed her Master'south in concern communications & project management.

More Articles

Source: https://itstillruns.com/change-injectors-2002-chevy-trailblazer-6725576.html

Posted by: gordonquamblus.blogspot.com

Share this post