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Questions and Answers

Ford Taurus Stalls When Slowing And Stopping

Q. Hello, I own a 1993 Ford Taurus. I am the second owner of the car and had known the original owner. The problem is that the car stalls almost regularly whenever I am stopped at a light or stop sign and also when I am slowing down. I have had the idle air checked, also I have had the EGR valve cleaned.
Ford Taurus Stalls When Slowing And Stopping

All to no avail. My mechanic even disconnected the EGR valve tube in order to see if the car still stalled, and it does indeed. This is frustrating and of course, dangerous. Can you help?

Greenvale, NY

A. Greenvale, that's on the north shore of Long Island if I remember correctly. I grew up on the south shore, Massapequa to be precise.

Anyway, Has your mechanic checked the computer for any Diagnostic Trouble Codes (DTCs)? If there are any stored that will help us to determine where the problem is. For the moment I will assume he did and that there were none. I wish you included the engine size, it would have been most helpful.

First things first, how is the engines state of tune? If you don't know when the last time it was tuned up, then it would be a good idea to do it before anything else. We have to know the basics are good before we go looking for other problems. New spark plugs, distributor cap, distributor rotor, ignition wires, air and fuel filters will eliminate a bunch of cause for the stalling.

An oil and filter change along with a transmission fluid and filter change would be a good idea as well. At the very least you will have a base for future maintenance scheduling.

All that aside, if the are any of these DTCs stored in the computer, see the articles listed below.

  • 181, 189 (Fuel system lean, Bank 1 or 2)
  • 179, 188 (Fuel system rich, Bank 1 or 2)
  • 171, 172, 173 (HO2S11 lack of switching, Bank 1)
  • 175, 176, 177 (HO2S21 lack of switching, Bank 2)
  • 184, 185 (MAF higher/lower than expected)
  • 186, 187 (Injector pulse width higher/lower than expected)

Ford F150 Codes P0171 & P0174
Ford Expedition P0171 & P0174
Ford Mass Air Flow Sensors

Another possibility, if it starts this stalling after the vehicle has gone above 45 or 50 mph, is the Torque Converter Clutch (TCC) solenoid is sticking. When this happens you are, in essence, driving a car with a manual transmission and since there is no clutch to depress at a stop, the engine will stall. This can be checked by unplugging the connector going into the transmission and driving the car for a while. If the staling goes away, then we know it's a bad TCC solenoid.

There are a number of other causes of stalling as well. The throttle body may be dirty and need cleaning, there may be a broken vacuum line or PCV line. There may be a bad Coolant Temperature Sensor (CTS) sending incorrect data to the PCM. Another thing to check is the connector of the PCM. I have seen water get into them and cause all kinds of problems.

I hope I was able to help you in some way.

Additional Information provided courtesy of AllDATA and Warranty Direct

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© 2006 Vincent T. Ciulla

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