How to diagnose vacuum leak?

nick_sixx

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Hey guys, I am getting a CEL with P0171 (Bank 1 too lean), which apparently translates to a vacuum leak in the EA113 engine.

On initial inspection, the oil dipstick was badly cracked and was audibly leaking air, so I replaced it and reset the code. This helped for around 500km and now the same code is being thrown.

Are there any other common areas for leaks that I should look at?

The car is running a stage 1 superchips tune, intake, and HFC, so I'm not sure if there is a vacuum leak or an O2 sensor/tune-related issue

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I too have this problem at the moment, best to get a garage to use a smoke machine to find any leaks. It's generally one of the vacuum hoses that is split or perhaps faulty PCV valve