4.8silvy2004

Alright heres my efi log just wondering is it looks like my o2 sensors look normal because i have a mis at cold idles and driving just doesnt sound right which i have true dual exhaust is it normal for one side to have me exhaust air exit then the other ? also o2 sensors are pretty black so would that effect the way they work thanks guys

4.8silvy2004

heres another log while driving

BlackGMC

iTrader: (31)

Bank2 looks bad to me, you should have also logged STFTs and LTFTs, IMO looking at both at idle helps explain alot, for example intake leaks...

4.8silvy2004

does the second log have what u need which u also want short term?would this cause the truck run good and sound good to then running like **** and sounding also like a 6cly?

BlackGMC

iTrader: (31)

Was the first log done while the truck was warming up?

4.8silvy2004

yea it was i did it like that because thats when i really notice it

BlackGMC

iTrader: (31)

Makes sense, looks like the heater is dying or dead... The first log it is really slow reacting, but the second log after some driving it is alot better... Just my .02 replace both of them... I chased a similar problem like your having for months, finally replaced both 02 sensors and everything worked out...

There may be somehting else causing that 02 sensor to act funny but i don't know what that would be, but i would start with the O2 sensors.. You could try swapping them to see if the slowness goes to the other bank, just to verifiy..

4.8silvy2004

thanks alot man which i only have 48,000 on the truck is that normal which switching tunes and octane running no tune with no cats for a while and stuff like that cause to shorten there life ?

BlackGMC

iTrader: (31)

well i replaced the sensors in my 04 at 20k, it only has 47k on it now.... I bought ones with a 1 year warranty. I took them out at 11 monthes and had them replaced again, lol....

4.8silvy2004

alright i did a new log from a cold start to warm up and full throttle runs does everything look alright i noticed bank 1 looks slow to me what do u guys think thanks mike