How do you perform a stall test?

Stall test procedure

Drive car or run engine until engine and transmission has attained normal working temperatures.
Check the level of fluid in the transmission box and correct if necessary.
Apply the hand brake and chock the wheels.
Connect a tachometer via leads to the coil ignition terminals.

What is a transmission stall test?

Stall test consist of determining maximum engine speed obtained at full throttle in “D’ and “R” positions. This test checks torque converter stator overrunning clutch operation, and holding ability of transaxle clutches and low-reverse brake. Check transaxle fluid level.

What precautions should be taken when stall testing?

Do not allow the transmission fluid to exceed 174° F. During a stall test, make sure that no one is standing in front of or behind the vehicle. During a stall test, the torque converter’s impeller is spinning at maximum speed while the turbine is held stationary.

What is a stall in a transmission?

Stall is when the transmission is in gear, but the brakes prevent the car from moving. At stall, the torque converter can produce maximum torque multiplication, called stall ratio, if sufficient input power is applied. That’s stall speed.

Can an automatic transmission stall?

An automatic transmission can also cause a car to stall, but that’s a much bigger problem. If the torque converter isn’t engaging and disengaging correctly, or if the automatic transmission fluid is old or leaking, the transmission could slip and cause your car to stall.

How does a stall converter work?

When your torque converter prevents the power transfer from your engine to your transmission, it increases the engine’s RPM stalls. For example, when you press down on your gas pedal, the stall speed is the gap between where your vehicle ideals and begins to move.

What to do if your Ford Expedition is stalling?

Before troubleshooting any automotive issue, including stalling issues with the Expedition , make sure that you check the vehicles trouble codes with an OBD2 scanner. Trouble codes are always a great place to start diagnosing problems on today’s modern computer controlled vehicles. Without them, you are in the dark.

What is the problem with my Ford Expedition?

If this is happening to your Ford Expedition, the problem is likely a clogged fuel filter. However, a more serious problem could be uneven compression in the cylinders. This happens primarily as the Expedition ages. Mileage, not years, will measure how old the SUV is.

Why does my Ford Expedition starter not crank?

35 people found this helpful. In my 2004 Ford Expedition the starter would not crank when I turned the ignition on. I tested all the fuses, went to auto zone to have them test the starter it was fine I took out the old volt meter and began checking the connections from the battery all were working.

How is the transmission of a Ford Expedition controlled?

Electronic transmissions are controlled by a computer, otherwise known as the powertrain control module (PCM). Troubleshooting the PCM is a complex job that requires some special test equipment that the average do-it-yourselfer does not have—nor is cost effective for them to purchase.

Is there a problem with my Ford Expedition?

WE GOT A CALL BACK, SAYING THAT THEY STILL HAVE NO IDEA WHAT IS WRONG, AND THEY ARE DONE LOOKING FOR THE PROBLEM, AND TO COME PICK UP YOUR VEHICLE. SO WE ARE NOW DRIVING AN UNSAFE VEHICLE, AND THEY DO NOT CARE. WE ONLY HAVE 40,000 MILES ON THE VEHICLE.

How does the transmission work in a Ford Expedition?

The Powertrain Control Module (PCM) and its input/output network control the following transmission operations: Torque converter clutch operation. The transmission control is separate from the engine control strategy in the powertrain control module, although some of the input signals are shared.

How does the ignition control module work on a Ford Expedition?

The ignition control module operates by sending crankshaft position information from the crankshaft position sensor to the ignition control module. The ignition control module generates a profile ignition pickup (PIP) signal (engine rpm) and sends it to the PCM.

How do you perform a stall test?