Whenever you descend below a certain speed your car begins to slow down and sometimes even the engine stops for no apparent reason?
It seems obvious that this is unusual. In this article we will try to give an answer so that you can see more clearly before perhaps going to the garage and get a steep bill to mend your Mazda CX 9.
However, if this happens while driving at rather high speeds, do not take any more pointless risks. Call a professional urgently. Imagine that this happens to you on the ring road or highway….
First thing to consider, and it may seem odd, but it has happened to some people before: Do you get fuel all the time at the same pump for your Mazda CX 9? In this case, it could come from there. Try changing gas pumps, and observe what happens. This is unlikely but it doesn’t cost much to try it. The fuel you get from here might contain dirt or impurities that damage your Mazda CX 9’s engine.
If nothing changes, let’s look at the more technical causes you are exposed to on your Mazda CX 9.


Electronic part of your Mazda CX 9 :

The first element is the MCU (Motor Control Unit) box. You may want to know what this piece is. In a few words , it is a metal box made of a multitude of electronic elements whose purpose is to receive electrical signals, developing these data, and sending information to the various parts of your Mazda CX 9. It is a platform to manage your car’s information.
As you have understood, if it were to not work properly, the consequences could be serious for your Mazda CX 9. A motor that stops can be a indication.
Apart from that, look at the engine speed sensor side, or the onboard computer. It is a platform for swapping calculations and is consequently essential to the engine.

Another potentially targeted box is the built-in systems interface, which centralizes all the information from the multiple sensors throughout your vehicle. It operates as a relay platform for all your calculators. It is similar in some ways to a computer motherboard. So you understand the importance of this on your Mazda CX 9.
Regarding sensors, also consider your TDC sensor.Its role is to send information to the calculators regarding the position of the pistons in order to determine the engine speed, which will then assess the fuel injection.
Last but not least, consider your alternator, which would not anymore allow your Mazda CX 9 to be powered. Same concern if it originated from the ignition coil.
Finally, because this case is much rarer, it might occur that a wire or connection is harmed, and your computer could no longer perform properly.
So here’s for the electronic causes. Let’s now look at the mechanics on your Mazda CX 9.

Mechanical part of your Mazda CX 9 :

First, only a blocked filter can affect the life of your engine. Remember to clean it regularly. The injection pump, or also the pressure regulator, are also parts to be inspected.
The idle actuator could also very well be involved .
Its purpose is to regulate the engine speed as part of the all around idle control of the engine management system. Thereforedirectly affecting the engine .
Another factor, more rare but also possible, is Neiman’s contactor. It is what allows to lock the steering wheel for security when the ignition is turned off. It is related to the engine so a failure may well also have effects on the Mazda CX 9’s engine.

Here are the main causes, whether electronic or mechanical, that could cause your Mazda CX 9 to slow down.
In a few words, first verify the simplest things, dirty pieces, then identify about the electronic parts that may be involved.
If you were about to start fixing on your own, be really cautious on what you do, there is no substitute for the expertise of a professional.

Whenever you have any further questions about the Mazda CX 9, do not hesitate to consult our Mazda CX 9 category.