DrewJ2016 Posted June 12, 2020 Share Posted June 12, 2020 I have a 06 AI-350 with the Allison automatic that has low power. Flatbed, empty truck. It pulls okay on flat ground but falls on its face when going up hills. Have to hold it flat on the floor to maintain speed it seems like. Fuel filters have been changed, checked for codes using tech tool, only has brake ecu codes. Fuel pressure at idle is 62 psi, 68-72 psi under load. Put a boost gauge on, needle was erratic hit like 30lbs and broke my gauge. Boost seems to come up really slow. Haven’t had a chance to pressure the charge air cooler, but boots appear good and no visible or audible boost leaks. Not sure what parameters I could possibly change, torque limit, speed, etc. Compression test shows good, injector cut out test feels good, did the injector/ unit pump run up test good as well. Asking for any help please, thanks Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted June 12, 2020 Share Posted June 12, 2020 7 hours ago, DrewJ2016 said: I have a 06 AI-350 with the Allison automatic that has low power. Flatbed, empty truck. It pulls okay on flat ground but falls on its face when going up hills. Have to hold it flat on the floor to maintain speed it seems like. Fuel filters have been changed, checked for codes using tech tool, only has brake ecu codes. Fuel pressure at idle is 62 psi, 68-72 psi under load. Put a boost gauge on, needle was erratic hit like 30lbs and broke my gauge. Boost seems to come up really slow. Haven’t had a chance to pressure the charge air cooler, but boots appear good and no visible or audible boost leaks. Not sure what parameters I could possibly change, torque limit, speed, etc. Compression test shows good, injector cut out test feels good, did the injector/ unit pump run up test good as well. Asking for any help please, thanks Mack had issues with that vintage of tier 3 engine. If you have all your vital signs then you need to take it step further to get it to perform. It's very fixable.... click on link. Quote Link to comment Share on other sites More sharing options...
storkmack Posted June 12, 2020 Share Posted June 12, 2020 12 hours ago, Mack Technician said: Mack had issues with that vintage of tier 3 engine. If you have all your vital signs then you need to take it step further to get it to perform. It's very fixable.... click on link. We did this to an 05’ 427 granite and now it’s a beast! 1 Quote Link to comment Share on other sites More sharing options...
Mack Technician Posted June 13, 2020 Share Posted June 13, 2020 37 minutes ago, storkmack said: We did this to an 05’ 427 granite and now it’s a beast! We wouldn’t trade that AI 460 in for an E-Tech. My buddy hauls 110K all day moving equipment and loves it. I do wince a little when I see a 12 liter pounding that much horsepower/torque & payload. 2 Quote Link to comment 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.