Welcome Visitor! Please take a few seconds and 
icetherice
Well-Known Member
Few months back a new MAF solved my P0171.
Now I have a P0172. I think HO2S1 is finally kicking the bucket because I've gotten many more 'dropped voltage' spikes. The anomaly I was seeing last time I played with my datalogger when I was chasing the lean condition.
Going to drop the whole exhaust later today when it warms up above zero.
Something interesting that I found while logging was that my TPS doesn't appear to return to 'true zero' while driving. When I first start my truck and I'm letting it idle the throttle position is sitting at 17.6%. When I snap the throttle shut to engine brake the TPS only returns to 18% and she continues to gurgle and pop out the exhaust. I don't feel the true effect of engine braking and the HO2S1 voltage doesn't lean out, it continues to oscillate.
Is this something that a bit of WD-40 will fix or is it time for a new TPS too??
Now I have a P0172. I think HO2S1 is finally kicking the bucket because I've gotten many more 'dropped voltage' spikes. The anomaly I was seeing last time I played with my datalogger when I was chasing the lean condition.
Going to drop the whole exhaust later today when it warms up above zero.
Something interesting that I found while logging was that my TPS doesn't appear to return to 'true zero' while driving. When I first start my truck and I'm letting it idle the throttle position is sitting at 17.6%. When I snap the throttle shut to engine brake the TPS only returns to 18% and she continues to gurgle and pop out the exhaust. I don't feel the true effect of engine braking and the HO2S1 voltage doesn't lean out, it continues to oscillate.
Is this something that a bit of WD-40 will fix or is it time for a new TPS too??
