Fuel Injector Check
WARNING: This page is about a different car, the 1997 Volkswagen Passat. However, it is still accessible from the selected car via links, so may be relevant.
- To check for defective fuel injector, start engine and allow it to idle. Loosen high-pressure fuel line banjo bolt at first fuel injector and listen for decrease in engine speed (RPM). Re-tighten bolt to 18 ft. lbs. (25 N.m). Repeat procedure for each fuel injector.
- If fuel injector is operating properly, engine RPM should decrease when high-pressure fuel line banjo bolt is loosened. If a faulty fuel injector is suspected, check fuel injector and circuit. See FUEL INJECTORS & CIRCUITS under FUEL SYSTEM in I - SYSTEM/COMPONENT TESTS - 1.9L article.