Mercedes Repair Questions? Ask a Mechanic for Answers ASAP
Were the fault codes read out from Engine Control Unit? If yes, which ones were strored?
i have requested the fault codes of the computer, as soon as i get them i will let you know
Ok, let me know once you have the codes.
Apparently all the fault codes have been removed from the computer, thats a good way to stop somebody else knowing what is wrong. They now tell me that number 4 injector is faulty and that a faulty injector will stop the engine dead. I find that hard to believe but my mechanical experience is 30 years old as that is when I left the trade. They say that the only fault code still on the computer is a low pressure one. amazingly only 2 weeks ago they told me that all the injectors were ok.
Also the vehicle will sometimes go for 6 to 7 hundred kilometres before any trouble and sometimes only a couple of hundred metres
I would be looking for a bad electrical connection or a problem with the ignition switch, what are your thoughts?
According to the symptoms, and if the fault codes confirm electrical fault of the injector- that would cause the engine to shut down.
CDI injectors are actuated by a high-voltage signal produced by a single condenser for all of them in ECU. If one injector shorts out - all others are switched off.
But a common problem on Sprinters is injector wiring harness rubbing through at the intake maifold support. So due to a vibration, the damaged injector wire comes into contact with engine ground and shuts the engine down intermittently. So i suggest to start with a thorough wiring inspection starting from injectors and up to the ECU.
But the common failure spot is at the metal intake support.