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post #13 of (permalink) Old 6th August 2008
Technical Supremo

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Chugging can be for a number of reasons and many of the faults don't seem to be detected by diagnostic equipment although it seems many mechanics seem to think if there is nothing showing on diagnostics then it must be OK. When are they going to wise up and use their eyes and ears - I would hate to think if the diagnostioc equipment didn't detect a flat tyre they would say there is no problem. For some reason some don't even want to believe the customer. Let's be honest would the customer come for assistance if he didn't think anything was amiss.

Damaged or worn injectors or fuel pumps tend to cause fuel pressure problems which would tend to show up on the ECU . I have seen situations where diagnosis doesn't detect duff EGR valves and also TDC sensors. If it were mine I would ensure the EGR valve and its housing were clean and then move on to the TDC sensor and its connections. Sadly in many situations its a process of elimination especially when it comes to intermittent faults. There are also a number of visual checks that can be carried out such as checking wiring connections to various engine sensors and the state of the intercooler, etc.
I all honesty it may be better to seek advice from a diesel specialist rather than throw more money at the same garage.
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