All Other Engines

Disconnect the PCV valve hose from the PCV valve.

Start engine and run at approximately 2000 RPM. DVOM should indicate less than 0.4 volt within 30 seconds. If not, replace HEGO sensor. Reconnect vacuum hoses and repeat QUICK TEST. If voltage is to specification, HEGO sensor is okay. If engine has sequential PFI, fuel delivery is okay, problem is in an area common to all cylinders, such as a vacuum leak, fuel contamination, EGR system, MAP frequency, etc. Service as necessary. For all other engines, go to step 1) of this test.