For 1990-2009 cars only
- 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 reinstallation.
- Inspect the fuel injector nozzle tip (1) for cracks, dents, or other damage.
- Inspect the nozzle tip (1) for any signs of discoloration - dark yellow, tan, or blue due to excessive heat.
- Replace the injector if any damage is found.
- Clean the fuel injector high pressure line.
- Inspect the fuel injector high pressure line for excessive corrosion or damage to the sealing surfaces (1, 2). Replace the line if any damage is found.
Caution: The fuel injector must be cleaned with the proper cleaning equipment. DO NOT use abrasive cleaning methods, such as a metallic brush, to remove deposits. Cleaning an injector with improper tools will damage the fuel injector.
