Fuel Injector Balance Test
WARNING: This page is about a different car, the 1997 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Connect Tech 1 scan tool and select INJ BALANCE TEST. Start engine. Record change in engine speed and idle quality as each cylinder is disabled. Engine speed and idle quality changes should be equal for all cylinders. If changes are not equal, check ignition system or perform further diagnostics. See the TESTS W/O CODES or the TESTS W/CODES article.
CAUTION:
To avoid possible vehicle fire, wrap shop towel around fitting to absorb fuel spillage. NOTE: If injectors are dirty, they should be cleaned using approved injector cleaning procedure before performing FUEL INJECTOR BALANCE TEST.
FUEL PRESSURE RANGE CHART
| Application | psi (kg/cm2 ) |
|---|---|
| 4.0L | 48-55 (3.4-3.9) |