# I dont totally understand the process but could the humid air vs. dry out west affect it? nm

Posted by portdave (93se) on September 14, 2004 at 09:00:20: 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: I've tuned my car outside Vegas in sunny, humid Socal. So I doubt weather is the issue. n/m Aaron (92 SE Auto) 09:07:31 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.