Initial Inspection and Diagnostic Overview

CHECK CONDITION: Coolant temperature 85-95°C (176-203°F)





1. Disconnect the vacuum hose (green stripe) from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.





2. Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum remains fairly constant.

NOTE: If there is a problem with the change in vacuum, it is possible that the throttle body EGR port may be clogged and require cleaning.