06Sierra2

ok, so i finished my cam swap at about 0430 this morning. the truck started on the first try, had oil pressure instantly, and didnt die. with hpt just reading off the maf it was running just slightly rich. however, it seemed to be spitting out alot more exhaust gasses than normal and it smelled really rich. our eyes were burning just sitting outside behind the truck for a few minutes. is this something to be worried about? or do u think the tune is just slightly off and can be adjusted with the wideband?

budhayes3

iTrader: (19)

You probably just need the tune adjusted, you're now pumping more air and less vacuum and the PCM is compensating by adding fuel. What are the cam specs?

06Sierra2

224/224 .581 114lsa

budhayes3

iTrader: (19)

5.3 or 6.0? Either way, I'd think that much cam would definitely have an affect on the fueling...

06Sierra2

oh 5.3 sorry. yeah thats what i was thinking too. its a fairly large cam for a 5.3. i just wanted to see what all the pros on here thought. ima call my buddy tonight and see if we can put the wideband on and data log/tune

Lextech

iTrader: (18)

Bigger cams will idle in a higher MAP area of the VE table because the cams don't produce as much vacuum as stock. So, they idle richer. Typically a larger cam wants less VE and more timing in the idle areas.

Jeff

01GMC5.3

iTrader: (7)

well besides the issues how are you likein it ? I am about to put almost the same in mine

Wheatley

iTrader: (12)

That is normal,dial in your ve and maf tables using a wideband

06Sierra2

i gained 4 tenths and 3mph with the tune still slightly off. it lopes good with the cutout open and sounds great. feels like it pulls harder in the mid to top end. i am happy with it. i say go for it