Stall Test

Stall Test






Refer to Fig. 13.

The stall test checks converter clutch operation and installation, the holding ability of the forward clutch, reverse clutch, the low-reverse bands, the planetary one-way clutch and engine performance.
The test should be done only with the engine coolant and transmission fluid at proper levels and at operating temperature, and with the TV linkage set properly.
Apply the service and parking brakes firmly for each stall test.

1. Find the specified stall RPM for the vehicle by refering to the Technical Service Bulletin-Special Specifications Issue. Use a grease pencil to mark the RPM on the dial of a tachometer.
2. Connect the tachometer to the engine
3. In each of the following ranges for Automatic Overdrive (D), D, 1, R; for C6, C5-D, 2, 1, R; press the accelerator to the floor and hold it just long enough to let the engine get to full RPM. While making this test, do not hold the throttle open for more than five seconds at a time.
4. Note the results in each range
5. After each range, move the selector lever to N (neutral) and run the engine at 1000 RPM for about 15 seconds to cool the converter before making the next test.
6. Refer to Fig. 13 for corrective actions.

IMPORTANT:If the engine speed recorded by the tachometer exceeds the maximum limits given in the Specifications, release the accelerator immediately because clutch or band slippage is indicated.