2005 Evo. Fully built yada yada yada. It is an AEM car.

I recently converted my car to run E85 and after about 2500 miles of driving the r is running lean at WOT. Cruising and idle a/f are perfect but at WOT my a/f is around 14.2 eek. It was around 11.8 at WOT but just recently started this lean crap. My fuel system is all adequate BR double pumper, ID2000s, BR fuel rail. I pulled my injectors off the other night and they had a little crud around them so I cleaned them out hoping that was the cause but the problem is still there. I am in the process of running the e85 out of my car and running 93 octane through it to try and clear things up. Any other reasons of why my car is going lean all of a sudden? Could there be a restriction somewhere else?

 

Check the fpr hose on the intake manifold...might have come off...

 

Havve you checked the wb sensor it itself could be going bad giving false readings.

 

Any other ideas?

 

One of the fuel pumps could have went bad?

 

bad fpr as well

 

fuel filter?

 

Second pump triggered by AEM or Hobbs switch? Check those out...

 

Check the fuel filter. E85 is known to clean out the fuel tank and lines which can clog the fuel filter rather quickly