# What can make me run incredibly rich? 10.3:1 AFR!!! -->

Posted by Aaron (92 SE Auto) 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 noticed that in my car also Nismo87se (91 se-r) 13:42:14 9/16/2004 (0) Where's the A/F probe, before or after the cat. conv. MIKE (93VE) 16:28:34 9/14/2004 (1) I will still answer this even though I am at your house using your computer ... Aaron (92 SE Auto) 12:50:53 9/16/2004 (0) when you go WOT, the ECU completely ignores the O2 sensor and only reads the TPS and MAF signals. try calibrating the TPS. nm Matt (93SE) 09:01:25 9/14/2004 (1) Duhh... I completely forgot about open loop function... Aaron (92 SE Auto) 09:06:34 9/14/2004 (0) I dont totally understand the process but could the humid air vs. dry out west affect it? nm portdave (93se) 09:00:20 9/14/2004 (1) 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)

Name: |
E-Mail |
Car: |
Subject |
Message:
: 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.