holemi 0 Posted June 25, 2008 my Question is regarding the ACAV system of the 405 MI16 2.0 engine ..i have the common problem of a flat spot , the flat spot seems to hit at 4000 rpm all the way to 5200 rpm , at which point it flys...I am going to strip down the whole ACAV System early next month , i will be doing it blind as i havent a clue what to expect does anyone on here have experience of this sysytem that could advise ??? cheers Les Share this post Link to post Share on other sites