# when you go WOT, the ECU completely ignores the O2 sensor and only reads the TPS and MAF signals. try calibrating the TPS. nm

Posted by Matt (93SE) on September 14, 2004 at 09:01:25: In Reply to: What can make me run incredibly rich? 10.3:1 AFR!!! --> posted by Aaron on September 14, 2004 at 08:54:52: : I am driving my Maxima back to NC from FL one more time and I am watching my AFR. During cruising speeds, I am usually reading about 13.8 to 14.2:1. Well, it started reading 12.8:1. It only runs that rich sometimes. I bet my 3 year old OEM Bosch o2 sensor is puking on me. : At WOT in 3rd gear, I usually read about 11.6:1. Yeah, I know, that is rich. But I wonder if the VE is meant to run that rich or if my car is messed up. Well anyway, on the highway, I step on the gas and it starts reading 10.3:1!!! That is insane. : Then after 30 more minutes of cruising, it reads normal again. Then, the richness came back. : My question is, what things could cause such richness? o2 sensor? What about MAFS? Any ideas? : I have not checked my ECU codes or my o2 sensor diagnostic yet. But, I just wanted to see what you guys thought. Replys: Duhh... I completely forgot about open loop function... Aaron (92 SE Auto) 09:06:34 9/14/2004 (0)

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: : I am driving my Maxima back to NC from FL one more time and I am watching my AFR. During cruising speeds, I am usually reading about 13.8 to 14.2:1. Well, it started reading 12.8:1. It only runs that rich sometimes. I bet my 3 year old OEM Bosch o2 sensor is puking on me. : : At WOT in 3rd gear, I usually read about 11.6:1. Yeah, I know, that is rich. But I wonder if the VE is meant to run that rich or if my car is messed up. Well anyway, on the highway, I step on the gas and it starts reading 10.3:1!!! That is insane. : : Then after 30 more minutes of cruising, it reads normal again. Then, the richness came back. : : My question is, what things could cause such richness? o2 sensor? What about MAFS? Any ideas? : : I have not checked my ECU codes or my o2 sensor diagnostic yet. But, I just wanted to see what you guys thought. :