markwoodlief
Full Member
As the title states my truck seems to idle rough after it gets up to operating temperature.
So far I've done:
I had a check engine light a few days ago, P0455. Which led me to replacing the two EVAP valves, light is off after that. Not sure which one I needed so replaced both. Cheap and easy to do.
I'm thinking I'll need to bite the bullet here and take it into a service center. I'm a fairly good wrench at home, but thinking a service center will have the more advanced diagnostic tools that I don't have. I've checked codes and there are none now.
I also should mention I can hook my truck to my laptop and get real time logging data for anything available in the OBDII for the Avalanche, which is quite a bit actually, but... I have no idea what i'm looking at.
I looked at the volts for the O2 sensors, trim levels, etc. But not sure what the volts are supposed to be for each piece. So am not rulling out a funky 02 sensor or even a cat at this point.
This is a 05 with 113k on it. Any thoughts on this? My wallet would much appreciate it.
So far I've done:
- Changed Plugs
- New MSD Wires
- Cleaned MAF with MAF cleaner
- Cleaned Throttle body with throttle body cleaner, then a seafoam session
- Seafoam in the tank
- replaced both EVAP valves, 1 under the hood near the throttle body, the other under the rear of the truck near the spare/exhaust/gas tank
- Replaced Both Upstream (before cat) 02 Sensors
I had a check engine light a few days ago, P0455. Which led me to replacing the two EVAP valves, light is off after that. Not sure which one I needed so replaced both. Cheap and easy to do.
I'm thinking I'll need to bite the bullet here and take it into a service center. I'm a fairly good wrench at home, but thinking a service center will have the more advanced diagnostic tools that I don't have. I've checked codes and there are none now.
I also should mention I can hook my truck to my laptop and get real time logging data for anything available in the OBDII for the Avalanche, which is quite a bit actually, but... I have no idea what i'm looking at.
I looked at the volts for the O2 sensors, trim levels, etc. But not sure what the volts are supposed to be for each piece. So am not rulling out a funky 02 sensor or even a cat at this point.
This is a 05 with 113k on it. Any thoughts on this? My wallet would much appreciate it.