Question about 1999 Mercury Mystique

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1999 mercury mystique check engine light - 1999 Mercury Mystique

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Why my Check Engine light comes on?
The engine computer or PCM/ECM
All modern vehicles have a computer or the ECM (Electronic Control Module) that controls the operation of the vehicle powertrain (the engine and transmission). The main purpose of this is to keep the engine running at top efficiency with the lowest possible emissions. With constantly growing demands for better fuel economy and new strictest emission regulations it's not very easy to achieve. The engine parameters need to be constantly and precisely adjusted according to various conditions such as speed, load, engine temperature, gasoline quality, ambient air temperature, road conditions, etc. That's why today's cars have much more electronics than in early days - there is a large number of various sensors and other electronic devices that help the vehicle computer or ECM to precisely control the engine and transmission operation and monitor emissions.
The vehicle computer system has self-testing capability. When the computer senses that there is a problem with some of the components it stores the correspondent trouble code(s) in its memory and lights up the "Check Engine" or "Service Engine Soon" light to tell you that there is a problem and your car needs to be looked at. To properly diagnose what is wrong, you need to take your car to a mechanic or a dealer. The technician at the dealership or a garage will then hook up the scanner to the car computer and retrieve the stored trouble code(s). Then he (she) will look it up in the service manual provided by a car manufacturer. The service manual contains the list of possible codes (about few hundreds) and describes what each code means and what needs to be tested. The code itself doesn't tell exactly what component is defective - it only indicates where to look, what engine parameter is out of normal range. The technician will have to perform further testing to pinpoint a defective part.

Posted on Oct 06, 2009

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Check the computer for engine fault codes

Posted on Oct 06, 2009

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1999 mercury mystique started making screeching sound then smoke came out from under hood..now the serpentine belt wont turn..what could it be


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Smelled mild burning, lost antifreeze - engine temp Hot. I looked under car and noticed a serverly frayed Belt - NOT the big surpentine belt - another small belt on the driver's side. 1999 Mercury Mystique...


For the 1999 Mercury Mystique Water Pump Belt on 2.5L V6 Engine:

Probable Causes: Belt: worn out, started slipping. Overheating caused by failure of Belt. Lost antifreeze: caused by failure of belt, not turning Water Pump Pulley, not circulating anitfreeze, which resulted in overheating.

Click on the following free direct Link. It has the Serpentine & Drive Belt Diagrams and Tensioners for your 2.5L Engine.
Scroll down the Page (about 1/3rd down) to Diagram #G99H08189, it shows the specific Water Pump Belt.
Note the Tensioner.
http://www.2carpros.com/car_repair_information/year/1999/make/mercury/model/mystique/1999_mercury_mystique_drive_belt_routing_diagram.htm

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!

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1 Answer

Timing degree


I have it all for you with pics but it is too large to post here.

Please email me at hydro83282@gmail.com and I can email it to you. Title it Timing.

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