SR20DET Loss of power/hesitation/misfire - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Kingtal0n · 10-26-2014, 01:00 AM

O2 sensor does not function at wot. So "loss of power" is not a typical symptom of a bad O2 sensor. When the sensor goes bad, then your closed loop operation is compromised, the engine will start "learning" the wrong fuel % values for each fuel map cell and the result is either too rich, or too lean, when driving during closed loop. yours sounds like "too lean", which would cause a consistent lean misfire, during idle/part throttle driving.

it would not cause, for instance, a misfire during wide open throttle.

10-26-2014, 01:00 AM	#1
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 42 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	O2 sensor does not function at wot. So "loss of power" is not a typical symptom of a bad O2 sensor. When the sensor goes bad, then your closed loop operation is compromised, the engine will start "learning" the wrong fuel % values for each fuel map cell and the result is either too rich, or too lean, when driving during closed loop. yours sounds like "too lean", which would cause a consistent lean misfire, during idle/part throttle driving. it would not cause, for instance, a misfire during wide open throttle.