hey all
i would usually never tune something im not familiar with and i am not a hemi guy, but a local customer approached me with what i thought was a simple issue so i figured i'd just do him a favor for cheap.
i always feel bad for guys that walk into a shop, they go hey cool lets add aftermarket stuff to your stock vehicle, then AFTER the job is done they say 'ohhhh yeah you need to get it tuned, and we don't know how, and we don't have anyone'
hoping you can help me help him
his story was he had a cam lope wipe out on his 2011 dodge ram 5.7 hemi. the shop fixing it talked him into a comp 201-300-17 and also an MDS delete kit (non-MDS lifters, from my understanding). my research shows this cam is barely bigger than stock so definitely not a very involved tune, and MDS deletes are commonplace.
his complaint was that after the cam swap, as the engine warmed up, it threw codes and the idle went to absolute hell, could barely get it home, but cold idle was great. the shop told him the MDS code needed to be tuned out and it'd probably be okay.
i disabled the MDS system and variable cam timing in the tune, and any code i could find related to cam timing or MDS, flashed it, and test ran it.
same problem.
review the log, and i find it enters closed loop, short term trims begin to drop to -20%, at which point it idles a bit rough but o2s reach target and they begin switching, then as temperature increases trims increase to -35% and o2s peg at which point it barely idles.
..... any tips ?
threw a log up if anyone interested