Question about 1994 Mercury Sable
If you hold the gas pedal 1/4 way down wend u start the car.it stay running until you let the gas go and it will stall.
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Posted on Jan 02, 2017
SOURCE: 2001 Mercury sable bad idle
CHECK THE PCV VALVE HOSE THAT CONNECTS AT THE BOTTOM OF THE THROTTLE BODY, THESE HOSES ARE KNOWN TO DETERIORATE AND ALLOW UNMETERED AIR TO ENTER THE COMBUSTION CHAMBER, WHEN THIS OCCURS THE OXYGEN SENSOR'S SIGNAL TELL THE PCM TO INCREASE THE PULSE WIDTH OF THE INJECTORS CAUSING THE VEHICLE TO ALMOST STALL.
Posted on Feb 27, 2009
Common issue at the shop (i'm a ford technician), here is what I do to correct it.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Posted on Mar 11, 2009
It could be the TFI (thick film ignition) ignition module on the distributor. When it restarts warm, but dies right away, it has a cranking circuit to initially fire the engine. After that, it switches to run mode, which may be be the problem circuit. Often times, when you take the cover off a bad module, it will have a bubble in the jell where the open circuit has heated up. Heat is the enemy of all electrical components and when they get warm is when the problems show up. This is my first guess. If you have access to a fuel pressure gauge, you can hook it to the pressure tap on the fuel rail and watch for a drop in pressure. It needs around 40 psi to run. Even a clogged fuel filter causing low pressure and flow can shut you down, but it shouldn't run good cold in that case either since fuel demand is higher on cold start. I hope this points you in the right direction. If not, I'd be glad to continue assisting your diagnosis.
Posted on Sep 16, 2009
SOURCE: stalls when idling
This generally is your throttle position sensor or Idle speed control motor. The idle is controlled by the Power Conotrol Module/computer & shouldn't really require adjustment at the throttle body if the components are installed & working properly.
The symptom you are describing is a textbook example of a failure in one of the parts listed above.
As always, I suggest you do check your air filter & fuel filter if not changed recently, use an OBD II tester to provide you with any engine codes that haven't yet triggered the "check engine" light. Some single codes don't trigger the light & some do, just a good check you can usually have done at a local auto parts store. Free as a rule from some of them. They want to sell you the parts! Good luck.
Posted on Feb 07, 2010
Sounds like you might have a stuck open EGR valve. Is the check engine light on. I would replace the fuel filter if it hasn't been replaced, also check the air filter.
Posted on May 31, 2010
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