Hi I have a 2006 e55. When I got it it drove good seemed to have lots of power. But then randomly it would lose power, I would floor it and it’s as though the supercharger wasn’t engaging or something. And then at times it would be normal And quick. I did research and the most common thing I though was the problem was the inercooler pump so I changed that. But I still seem to have the problem, any ideas??

 

use a $5 ELM327 to monitor your IATs.

 

I had no idea they were that cheap. Are the YouTube videos accurate? It's looks pretty cool.