Refined Trucker Posted December 30, 2014 Share Posted December 30, 2014 I am getting conflicting info from Mack mechanic and guy I bought EUP's from mechanic says will have to update ECM with new codes off of EUP. Supplier says no you don't on the ETech. Was wondering which is right. This is on an 01 ETech. Thanks for any insight. Quote Link to comment https://www.bigmacktrucks.com/topic/38258-eup-replacement/ Share on other sites More sharing options...
Dirtymilkman Posted December 30, 2014 Share Posted December 30, 2014 Yes you should have the ecm flashed. Doesn't have to be done immediately though. Quote Link to comment https://www.bigmacktrucks.com/topic/38258-eup-replacement/#findComment-272394 Share on other sites More sharing options...
j_martell Posted December 30, 2014 Share Posted December 30, 2014 i have also read about the need to flash the computer with the injector codes....not a (nessacity), but sooner rather than later.......(edit: it will run, but not well from what ive gathered) Quote Lack of planning on your part does not constitute an emergency on my part.... Link to comment https://www.bigmacktrucks.com/topic/38258-eup-replacement/#findComment-272395 Share on other sites More sharing options...
Refined Trucker Posted December 30, 2014 Author Share Posted December 30, 2014 Thanks guys. Was going to install at our shop. Can do that and get by Mack in a few days and have them update the codes then. Quote Link to comment https://www.bigmacktrucks.com/topic/38258-eup-replacement/#findComment-272421 Share on other sites More sharing options...
felicello122 Posted January 1, 2015 Share Posted January 1, 2015 I changed a few in mine, never flashed none of them, truck runs great been years,it does say to flashed them. Quote Link to comment https://www.bigmacktrucks.com/topic/38258-eup-replacement/#findComment-272719 Share on other sites More sharing options...
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