Hello Nation,
This is my second discussion on this forum and i need help regarding this code, i have had it for a while and i'm trying to figure out that's triggering it, my truck is a 2004 Trailblazer LT and here's what i did so far:
*I have cleaned the throttle body and replaced the seal.
*Replaced the Upstream O2 Sensor.
*Inspected the hoses and vacuum lines for any apparent tear and i couldn't find any.
I've read that this code related to a vacuum leak though i don't have a smoke machine but i'm building a DIY one hopefully it'll help.
The truck was running fine but i noticed something a bit strange regarding the RPM gauge normally before having the code my RPM is idling at 600-675 range, at start up the RPM rises up to about 1500 RPM (cold start) then it idles at ~600 range but now it sits at ~900 RPM most to the time sometimes it drops to 600 RPM for a bit then goes back to ~900 RPM, i'm thinking is has to do with the P0171 lean condition, could that be the case? I'm also suspecting the SAIS but i'm not quite sure.
Any idea where else should i look or what could the cause?
I'd really appreciate your input,
This is my second discussion on this forum and i need help regarding this code, i have had it for a while and i'm trying to figure out that's triggering it, my truck is a 2004 Trailblazer LT and here's what i did so far:
*I have cleaned the throttle body and replaced the seal.
*Replaced the Upstream O2 Sensor.
*Inspected the hoses and vacuum lines for any apparent tear and i couldn't find any.
I've read that this code related to a vacuum leak though i don't have a smoke machine but i'm building a DIY one hopefully it'll help.
The truck was running fine but i noticed something a bit strange regarding the RPM gauge normally before having the code my RPM is idling at 600-675 range, at start up the RPM rises up to about 1500 RPM (cold start) then it idles at ~600 range but now it sits at ~900 RPM most to the time sometimes it drops to 600 RPM for a bit then goes back to ~900 RPM, i'm thinking is has to do with the P0171 lean condition, could that be the case? I'm also suspecting the SAIS but i'm not quite sure.
Any idea where else should i look or what could the cause?
I'd really appreciate your input,