Fuel Injector Cleaning and Inspection

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: If reusing the old injectors perform the following:

Use a soft bristle non-metallic brush and top engine cleaner, GM P/N 1052626 or equivalent, to remove any deposits from the nozzle tip (1) and the copper washer sealing area (2) before re-installation.
Inspect the fuel injector nozzle tip (1) for any signs of discoloration (dark yellow, tan or blue) due to excessive heat.

Fig 1: Identifying Fuel Injector Nozzle Tip And The Copper Washer Sealing Area
Courtesy of GENERAL MOTORS CORP.
Replace the injector if any damage is found.

Fig 2: View Of Fuel Injector High Pressure Line

Courtesy of GENERAL MOTORS CORP.

Clean the fuel injector high pressure line.
Inspect the fuel injector line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.