04' rich condition???
Thread Starter
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
04' rich condition???
Went to the track last night. And it was very hot and humid. Just in the hour when the sun started going down and the temperature droped 10 degs, I picked up 3mph. I have just installed a wideband oxygen sensor and my car goes way rich in 3rd and 4th gear. The air/fuel ratio drops into the high 11's(11.7/11.8). I also had some spark knock in those gears. So either I am running rich in those gears or what I think is really happening is that under the higher load of 3rd and 4th I was getting spark knock and the computer was pulling timing and adding fuel to correct it. What do you think is causing this rich condition? In 1st and 2nd gear my air/fuel is right on at 12.7 and 12.8.
Opnions please...
Also the car only has 2900 miles so I'm not to concerned about carbon build up in the cylinders yet.
only mods are Vararam, B&B's cat back
Opnions please...
Also the car only has 2900 miles so I'm not to concerned about carbon build up in the cylinders yet.only mods are Vararam, B&B's cat back
Thread Starter
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
The only thing is that in 1st and 2nd gear up to 6000rpm the air/fuel is fine at 12.7. Its only when it gets into 3rd/4th gear that it goes rich to 11.8. It still has stock tuning. I will get it tuned as soon as I get the headers installed. Its just weird that the mixture is fine in 1st/2nd gears and not in 3rd/4th gears.. 
Burning Brakes
Joined: Jun 2004
Posts: 884
Likes: 1
From: McKinney TX
If I were to guess I'd say the ECU is making changes down the track for increased airflow. By then you are getting hot + increasing the air moving with the Vararam. Tuning should alleviate any issues. You are rich enough that you shouldn't have any worries until then. 
