Originally Posted by RWacker53
to "SJWilson48"; what was your final resolution to this "P0171" code that you were getting on your 2002 Envoy?
Did it turn out to be loose manifold bolts?
I also have an '02 Envoy that's been posting this Error-Code, but haven't thrown any parts at it yet.
Yeah seriously, at least i want to know! So instead of creating a new thread, I thought it would be "resourceful" of me to tack onto this post. So I ended up changing my ECT sensor on my trailblazer 06, which was a complete pain in my ***! Temperature gauge on my dash is finally reading accurately, but the code is still up so i think the thermostat might be gone as well? I don't know I don't want to get into it now because I have a bigger problem. Hopefully I'm posting in the right forum!
So I'm running a code p0171 "system too lean bank 1." Does that mean I'm getting to much oxygen or not enough in the engine? This is a '06 trailblazer that I bought about 6 months back. A lot of problems that I've been having to fix. Vehicle came from Maine, which is rough terrain up there and cold winters, and I bet whoever had the vehicle probably beat on it a little and took it off roading. It has about 126xxx miles on it! I've already fixed so many codes, and problems I lost count! I think its because its a old vehicle with a lot of miles and it came from the state of Maine..bad winters..
The tb is surging when I start it up, almost sounds like its going to stall about every 2 or 3 seconds. When I'm driving it, it performs horrible, horrible acceleration. I cant really notice the surge when i'm driving , but i can hear it when i'm on the brakes and the car is idling. I also have an exhaust leak, I don't know if that's triggering the code, but i doubt it because exhaust leaks are emissions. I think the leak is in the manifold gaskets. That's for another day though. I know this code is "broad" and can mean many things, it's hard to track it down, so I was seeing if someone could help or give me some advice.