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2026. 6. 30. 작업

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How can I diagnose intermittent low boost on a turbocharged diesel?

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Based on what you're stated in the question, it sounds as if your turbo is basically working – so the question is how to figure out what, if anything, is wrong and causing low/absent boost at times. Ideally, you'd have access to a tool that would plug into the diagnostic port and enable you to compare the requested boost from the ECU with the actual boost being delivered by the turbocharger. For VW diesels (which is what I'm familiar with) the tools of choice for this is VCDS , BMW diesels are (as best I can tell) nonexistent in the US, but there appear to be similar tools available for them as well. If you have access to a diagnostic tool, start by checking for any turbo related DTCs. Then, take a look at the requested vs. actual boost (either by logging the data or having somebody monitor the computer as you drive) to see how they match up. It would be interesting to see if the ECU is asking for boost and not getting it, or if there is some reason why it might not be asking for it. W