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3

I found the issue. A small vacuum hose that goes from the vacuum pump to the turbine (waste gate, I assume) was disconnected during the emissions test and just left hanging. It's in a difficult-to-see spot underneath a bracket located between the engine and the battery. The hose is dirty and grimy, while the end of it was shiny and clean. It fits snugly and ...


2

You don't adjust the air flow meter, the meter's job is to give accurate air flow readings to the engine computer to it can adjust the fuel-air mixture. If the air flow meter isn't delivering accurate information to the computer then it needs to be cleaned/repaired, not adjusted. Most allow no type of adjustment anyway. It may be it just needs a clean, how ...


2

I got the car to a shop, and they found the cause for the humming. I guess it can be useful to others with the same issue. What happened, was that the LPG expansion chamber (this particular model, at least) has an approximate lifetime of 100'000 km and, while it works quite well during that span, it gets clogged with residuals from the gas. Once (well, a bit ...


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