The vehicle will start when pushed and run for a while, fairly far if you are not too heavy footed, but will not start off the key. There is no diesel coming out of the injectors when the engine is cranked. The fuses are all ok. The agent, 2000kms away, says that the high pressure pump and injectors require replacing - very costly and as I am in a country not covered by the warranty and it looks like I'm paying. The vehicle has done just over 40 000kms. Not a very good example for Mazda if I have to replace the pump and injectors. Help please.
I don't think there is any problem with injectors but the cause could be pump
just loosen the pump bolts a little bit so that you can move the pump with leverage to advance
check the heater plugs as well
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What kind of idling problem ? An what year Mazda ? Idle is controlled by the engine computer via a IAC motor , idle air control valve or motor, what ever Mazda calls there set up ! Or if a fairly new vehicle, they use drive by wire or electronic throttle control . With the idle air control set up passages get plugged an don't allow enough air to by pass the throttle plate causing stalling problems . A vacuum leak can cause a ruff unstable idle an stalling also . A dirty throttle plate can cause idle problems as well ! A scan tool ,not a code reader is a very use full tool to check engine data parameters. With the scan tool you can view idle air control counts . To see if the engine computer is actually controlling the idle air control valve . Idle Air Control Valve
Also an engine misfire can cause idle problems , also clogged fuel injectors can as well . A good diagnostic technician would start with hooking up a professional grade scan tool , checking for DTC'S - diagnostic trouble codes , misfire data , engine sensor data , IAC counts ! Section 20 Idle Speed Controls lecture preview
If the vehicle has a diesel engine and it starts with black smoke that clears you should put some injector cleaner in the fuel tank, a couple of treatments should clean the injectors.
If the smoke is grey/white perhaps you should have the engine checked for issues.
If the vehicle has a petrol engine maybe the valves need some attention.
Ideally you should have the people who supplied you with the vehicle take a look at it . The problem wit himports is that some elements of a vehicle need modification to run correctly, this sounds as though something more serious may be ammiss
The oil level is reducing quickly, that needs investigation.
I would say that the person who supplied you with the vehicle needs to take a very close look at the engine.