Cowart Tractor Posted January 23, 2021 Share Posted January 23, 2021 I recently purchased an 05 Mack ch613 with the 427. Runs great. Fuel economy towing my equipment seems a little low. Average of 5.3mpg. Has a check engine light for egr mass flow sensor. Assuming egr not acting properly is affecting fuel economy. Was wondering which direction yall are going about making that side of the engine a little lighter, if you catch my drift. Quote Link to comment https://www.bigmacktrucks.com/topic/65643-05-mack-427/ Share on other sites More sharing options...
fjh Posted January 23, 2021 Share Posted January 23, 2021 (edited) Chances are you have a failed EGR cooler ! usually the mass flow and the cooler will be changed at the same time! is the unit using any coolant?if the cooler looks like it has been replaced and the mass flow wasn't changed the code will remain! Another thing to note these engines were not horribly fuel efficient to start with! A guy Could lighten the situation You would need to make plate for beneath the egr valve an plug the coolant off to the cooler! Down sid is the malfunction light stays lit all the time and you won't know when important shit is going wrong! Edited January 23, 2021 by fjh 1 Quote Link to comment https://www.bigmacktrucks.com/topic/65643-05-mack-427/#findComment-467484 Share on other sites More sharing options...
OldRedMack Posted January 23, 2021 Share Posted January 23, 2021 I am sorry if I'm highjacking this thread, but this makes me think of a question I've had for a long time. On the AC motors like this one, could you get a ECU and VCU off of an AI engine and just put a regular turbo on the truck? Or am I way off base with that? Quote Link to comment https://www.bigmacktrucks.com/topic/65643-05-mack-427/#findComment-467486 Share on other sites More sharing options...
Cowart Tractor Posted January 23, 2021 Author Share Posted January 23, 2021 Looking for someone who can possibly tune the ecm so that I dont have a light. Quote Link to comment https://www.bigmacktrucks.com/topic/65643-05-mack-427/#findComment-467506 Share on other sites More sharing options...
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