Leaning out

[Jake_isr]

After driving my car down the highway for about 10 minutes the a/f guage starts migrating over to the lean side and then stays there. I pulled over and let the car rest while off and then it works fine again for about five minutes each time till it leans out again.

Let me know what you think I am buying a split second version 1 to try and correct and make other changes anyways.

Running with a rrfpr from begi and a flying mazda splice.

 

[ogsp5]

The SS afc is best bang for the buck. Do some data logging, then dyno tune. Check to see if you have a vacuum leak. That will cause you going lean. I am heading back to get my SS adjusted next week.

 

[Metallic36]

Someone told me that if you're upping your boost and your injectors are maxing out, that can cause you to go lean too.. (dunno)

 

[Jake_isr]

I'm not running any more boost and not even putiting a load on the manifold when it leans out. Its like the computer is trying to adjust for something after a given amount of time.

 

[ogsp5]

Check for a leak, maybe you vacuum lines or couplers. I just found a leak around the MAF !!!!

 

[HondaEat-R]

An exhaust leak before your wideband can cause things like this as well. What's your idle like ? Lean also ?