Vehicle health monitor ELM327 is working but most of the numbers are wrong

Just got my new ELM327. Pluged in, paired. But the figures are totally wrong. It reads random positive numbers for turbo pressure although I have a NA engine. The speed keeps jumping back to 0 while I am driving. The coolant temp randomly jumps back to 32F also. The only right number is RPM but there’s serious delay. I’ve tried different phones and cars, can’t figure out why.

What car / model / make / year do you have? And in what market (Asia, US, Europe, etc…)?

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