covey Posted January 1, 2012 Share Posted January 1, 2012 i have a 2004 mack truck , model cx 613, with ac-460e engine, the truck , when driven for 15 minutes or 15 km`s , the check engine light comes on , flashes 3 times and the rad fans goes on high, the power drops, rpm`s around 1200, and if you push higher the truck shutters, also when you shut the truck down , the engine runs for about 5 seconds after key turned off. checked the codes at repair center, they said it is an, fmi 8 , which means abnormal response. but i have learned the code also is a communication for j1939, this has the truck in no work condition , also has had the engine control unit and j1939 , both replaced, any help will be appricated. you can contact me at my e-mail, coveydog_12@hotmail.com...thanks for help... Quote Link to comment https://www.bigmacktrucks.com/topic/22414-2004-mack-losing-power/ Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.