Having problems with your 2003 Mercury Mountaineer ?
Reasons why 2003 mountaineer who stall when coming to a stop
The\012following are the general instructions on the start of diagnosing any\012electronically controlled engine or transmission problem.
The\012engine and the automatic transmission (transmission control is\012only for automatics, engine is still computer controlled no matter\012the transmission type) in this vehicle are computer controlled and in\012most cases when a fault occurs a fault code is stored in the memory\012of the computer control module. There are exception to this, such as\012the Mass Airflow Meter and fuel pressure problems. What must be done\012is to have all the basic testing done such as a scan of the system\012for fault codes as well as a check with a live data scanner tool for\012engine functions that are not within range of normal, a trained\012technician is required to know what is correct and what isn't, then\012based on careful diagnostics done from a factory repair manual the\012correct part is replaced or the wiring repaired or the computer\012replaced (known as the PCM or ECM,ECU), which is very rarely the\012problem. Other basic checks must be done as well such as mechanical\012problems with the engine as well as engine state of tune and mileage\012on the engine. The transmission can have mechanical issues as well\012such as no gear engagement at all or a failed pump or other pressure\012related problems. Also engine mechanical problems can and do cause\012many drive-ability related problem such as rough idle and other\012symptoms.
Tips for a great answer:- Provide details, support with references or personal experience .
- If you need clarification, ask it in the comment box .
- It's 100% free, no registration required.