Wheels Posted January 26, 2019 Share Posted January 26, 2019 (edited) Bought 2009 Mack run first trip has no power! Prior owner took truck back to fix it been three weeks can’t figure it out no codes and low boost , any ideas? Edited January 27, 2019 by Wheels Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/ Share on other sites More sharing options...
0 JoeH Posted January 26, 2019 Share Posted January 26, 2019 Clogged fuel filter..... You didn't give us much info... What model, what engine... Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414195 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Changed fuel filter put in Howe’s and new fuel Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414236 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Engine is a mp8 Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414237 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Tested air to air was good Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414238 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Changed actuator on turbo Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414239 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Checked fuel line pressure Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414240 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Replaced turbo Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414241 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Checked injectors and cups Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414242 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 No codes Changed ecm no change Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414244 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Boost runs top of 15 Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414246 Share on other sites More sharing options...
0 Wheels Posted January 27, 2019 Author Share Posted January 27, 2019 Any ideas. Been in 3 different shops one week per shop need advice! Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414248 Share on other sites More sharing options...
0 Mackpro Posted January 28, 2019 Share Posted January 28, 2019 Does any of the shops have the PTT premium tech tool program? If not your just wasting your time and money unless you luck out and find a obvious problem. Million possibilities, from incorrect tire size in the ECM , wrong boost pressure sensor. Wrong turbo mouning gasket. Stuck open EGR valve. I’ve seen the “spoon” on the EGR cross ovee pipe broken off and down in the intake manifold. Fuel pressure should be around 55 psi at idle and 65 at 1150 rpm. You really need to check it going down the road and should be in the high 60’s to 80psi. Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414281 Share on other sites More sharing options...
0 Wheels Posted January 28, 2019 Author Share Posted January 28, 2019 Don’t know all the technical stuff been on computers reprogrammed the ecm checked fuel pressure going down the road they said over 70 psi the truck has had some deletes don’t know exactly what that means! Quote Link to comment https://www.bigmacktrucks.com/topic/55413-mp8mack/#findComment-414300 Share on other sites More sharing options...
Question
Wheels
Bought 2009 Mack run first trip has no power! Prior owner took truck back to fix it been three weeks can’t figure it out no codes and low boost , any ideas?
Edited by WheelsLink to comment
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