I have an 08 Trailblazer LT 4.2 with 61k on it. Recently it threw a light and the code was p0171 which is lean on bank 1.
I have replaced the upstream o2 sensor, cleaned the MAF and throttle body with no luck, Pulled the plugs (looked fine)
A couple symptoms I've having, A rough idle while in D only and at a complete stop RPM's drop to about 600 and starts to idle rough but acceleration is normal. Now an odd one is while I'm driving and doing about 40-45 with no foot on the gas my RPM's will drop from about 1100 to 6-700 instantly and instantly jump back to 1100 with an clearly felt jump. My biggest problem is the gas mileage is absolutely terrible.
In addition now, I've had a P2270 (02 bank 1 sensor stuck lean) code pop up and a misfire on cylinder 6 code pop up. I've just dumped a bottle of Techron in last night on a empty tank to see if any relief, it hasn't. Any help would be much appreciated
I have replaced the upstream o2 sensor, cleaned the MAF and throttle body with no luck, Pulled the plugs (looked fine)
A couple symptoms I've having, A rough idle while in D only and at a complete stop RPM's drop to about 600 and starts to idle rough but acceleration is normal. Now an odd one is while I'm driving and doing about 40-45 with no foot on the gas my RPM's will drop from about 1100 to 6-700 instantly and instantly jump back to 1100 with an clearly felt jump. My biggest problem is the gas mileage is absolutely terrible.
In addition now, I've had a P2270 (02 bank 1 sensor stuck lean) code pop up and a misfire on cylinder 6 code pop up. I've just dumped a bottle of Techron in last night on a empty tank to see if any relief, it hasn't. Any help would be much appreciated