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Matt
Matt, Mechanical Engineer
Category: Car
Satisfied Customers: 20615
Experience:  BEng hons Mech engineering, in auto industry 22 years
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I have an automatice car, the ingine starts but thiers a

Customer Question

I have an automatice car, the ingine starts but thiers a noise when it starts it runs well baut the problem is when it stops, it well not run and in the ash board the ingine management light is on and the AT lughts as well.please if you have any idea how to fixed this or recomend any garraged it will be most appriciated.
Submitted: 19 days ago.
Category: Car
Customer: replied 19 days ago.
Do you think the gearbox is fault? I have problem as well i have changed the radiator in one of the gararges and the water does not circulate properly, do you think this is one of anothwr reason why it starts and run but when the car put on break or stop it lose its power to move.
Expert:  Matt replied 18 days ago.

Hello

you don't say what make and model this is but as you have a check engine light or other fault light this typically means one or more of the sensors has failed or has a faulty connection.

The fault can be something quite simple and nothing that’s going to stop the car to something quite major that will reduce engine power and possibly stop the engine

The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage

The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious.

You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.

Customer: replied 18 days ago.
Sorry my car is a mazda 5 seven seater Reg 2008. The engine still running but its loose its power to move when it stop, where can locate the sensor of the car to check them one at a time if thiers any fault? i bring this already to auto electrician garaged and they told me that the fault is lose communication control and it does not communicate with the gearbox.
Expert:  Matt replied 17 days ago.

Hello

do you happen to know the fault code that was extracted by the garage?

if there's a communication issue then its quite possible either there's a wiring / connector fault or something like a faulty body control module

if the fault code was extracted with a delaer level scan tool then this can really help pinpoint the location of the fault

Expert:  Matt replied 12 days ago.

Hi

do you still need help?

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