quaddump Posted May 8, 2010 Share Posted May 8, 2010 can anyone help me out with this probblem i drive a 2007 mack granit with the E-7 AI427 in it the probblem is when accelerating hard loaded or empty the turbo will be going like normal then at like 900 to 1000 rmp it seems like the turbo boos is being cut back for like 300 to 400 rpm the it will hit back in like nothing happend it onley does it some time but not all the time any body got any ideas what the probblem could be the truck and engine onley have 55000 mi on it and i drive to trucks with the same probblem but the other one is a 350 in it Quote Link to comment Share on other sites More sharing options...
Mackpro Posted May 8, 2010 Share Posted May 8, 2010 can anyone help me out with this probblem i drive a 2007 mack granit with the E-7 AI427 in it the probblem is when accelerating hard loaded or empty the turbo will be going like normal then at like 900 to 1000 rmp it seems like the turbo boos is being cut back for like 300 to 400 rpm the it will hit back in like nothing happend it onley does it some time but not all the time any body got any ideas what the probblem could be the truck and engine onley have 55000 mi on it and i drive to trucks with the same probblem but the other one is a 350 in itLook back for to other post about same problems. There is a software and datafile for this problem, we do it all the time, it's called the "step 12B program with throttle pedal calibration". A good Mack dealer should know how to do it. Free download from Mack but you will have to pay for the labor to install it. Check out this post/thread http://www.bigmacktrucks.com/index.php?showtopic=11429 Quote Link to comment Share on other sites More sharing options...
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