Hook n ladder 1 Posted February 24, 2019 Share Posted February 24, 2019 Correct me if I'm wrong. After installing a new eup,doesnt the shop have to reprogram the computer with a code or number from the newly installed eup? Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/ Share on other sites More sharing options...
fjh Posted February 25, 2019 Share Posted February 25, 2019 Yes cal code Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416599 Share on other sites More sharing options...
Hook n ladder 1 Posted February 25, 2019 Author Share Posted February 25, 2019 So the truck starts fine and runs great but idles like a pig. Could this be caused by not putting in the cal code? Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416619 Share on other sites More sharing options...
wilbur Posted February 25, 2019 Share Posted February 25, 2019 I have replaced 2 myself and never put in a code. Runs and idles fine. Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416631 Share on other sites More sharing options...
nelm1994 Posted February 25, 2019 Share Posted February 25, 2019 I replaced all 6 of mine on a 2006 ai 460 . never had anything done to the computer and have no codes. Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416641 Share on other sites More sharing options...
Mack Technician Posted February 25, 2019 Share Posted February 25, 2019 You don’t need cal codes to run well. Every OEM has been unable to answer the question “so why do you have cal codes”. IMO, It’s mostly a money game. Mack factory said it has to do with EUP unique volume, but that was the factory trainers best guess. Everyone else says they think it has something to do with emissions. Liehberr got rid of cal codes. Cat gives you a CD of what they call “trim” codes. JDeere still has them and includes uploading serial numbers of injectors so they can trace them on satellite. my understanding is a unit injector or EUP is considered a field service item, so they can’t render a machine unusable without plug and play. Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416642 Share on other sites More sharing options...
fjh Posted February 25, 2019 Share Posted February 25, 2019 12 hours ago, Hook n ladder 1 said: So the truck starts fine and runs great but idles like a pig. Could this be caused by not putting in the cal code? Won't likely change your issue ! Having said that I have had good idling engines come in for a cam change due to lifter failure and leave the shop with (a lope )At Idle I was never able to cure this issue so if there are suggestions on this I'm All Ears as well! I'm All Ears as well Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416643 Share on other sites More sharing options...
Hook n ladder 1 Posted February 25, 2019 Author Share Posted February 25, 2019 Thanks for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/55828-another-eup-question/#findComment-416670 Share on other sites More sharing options...
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