BCDD Operating Pressure
- To check pressure, engine should be at normal operating temperature, idle speed set to specifications and transmission in Neutral. Connect a tachometer to engine and a vacuum gauge to intake manifold.
- Run the engine under no load and note vacuum reading. Increase engine speed to 3000-3500 RPM on Maxima models, or 2000 RPM on Pickup models, then quickly close the throttle.
- Manifold vacuum should increase 23.6 in. Hg or more on Maxima models, or 24.0 in. Hg or more on Pickup models. Gradually decrease to idle level. Operating pressure should be 21.6-23.2 in. Hg on Maxima and 23.8-24.2 in Hg. on Pickup. If pressures at idle are not to specification, proceed to ADJUSTMENTS .