New to tuning/gen5 stuff just did headers only on a 2014 silverado, deleted all rear o2 sensors and its still running horrible and missing. heres the file with the rears deleted. Any info/advide or help is greatly appreciated!
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New to tuning/gen5 stuff just did headers only on a 2014 silverado, deleted all rear o2 sensors and its still running horrible and missing. heres the file with the rears deleted. Any info/advide or help is greatly appreciated!
Quote:
Originally Posted by Nastysilverado1
Log misfires in the vcm scanner for all 8 cylinders current and history. I've seen way to many people replace headers and not remove the spark plugs firts and then break the plugs and not know it. All you posted is the tune
Ryan
You can't delete the rear O2's. Put them back then check your plugs as advised. Without the rear O2's you're guaranteed to run 10% lean ;)
Will it make a difference if I no longer have cats? I?m getting a hard downshift from 2nd to first coming to a spot, as well as throwing dtc?s for lost connections with bcm,Tcm,ecu?rough idle?Quote:
Originally Posted by GHuggins
Post a log. Include some wide open throttle data in the log.
You need the rear O2s. What happens when you delete them without setting the background tables up accordingly is during decel it dumps fuel. It dumps fuel to "protect" the cats because it doesn't know what kind of state the cats are in. Doesn't matter if you have it set up correctly to not have cats. It's still going to go into oxygen storage protection modes. You should see it going pig rich during decel right after coming out of dfco. This is causing your bump. There are about 25 or so background settings that have to be changed just for removing the rear O2's. AND that's for offroad use or in a country where you can ;) Even with the rear O2's it still might intermittently do the rich fuel dump. Best to have that stuff if you can't alter it....Quote:
Other things you can do is massage your DD, DFCO mph settings and trans settings. Those alone will heavily alleviate it, but also won't fix it 100%. You have to do it all to have the stock drivability like I believe you're after.
So I changed the plugs today and low and behold their was a broken one in cylinder 5 it was wet as hell the rest had ash on them, it fixed the hard 2nd to first but I just went for a ride and I?m kinda stranded atm it acts like it?s running out of fuel then surges and breaks the tires lose I pull over for 10 mins and runs fine until I start going again for about a mile then does it again I?m going to fab the sensors into the long tubes tonight, worst part about it is I was using a friends computer to tune a little bit I couldn?t get mine to recognize the interface?
SOunds like your upstream o2 sensors are upset. Make sure your upstream o2s are reading correctly and not dumping fuel to one of the banks unnecessary