Guys. I need your help. I been research/google up. I have 2006 Silverado rscb. I went under frame want to look where my fuel flex sensor but I cant find? I just want to make sure before I can run some e85 for my boost. My friend tuned look file on hptuner say I do have one? He the one did change from returnless to return style with FPR. And pump is 450lph. But don't know about fuel flex. I think mine was l59 code on glovebox I hope right. I need look at again on the glovebox. Let me know about fuel flex if I have one so where?

 

anyone?

 

Read most of the way down the page. It looks like 2005 was the last year to use a sensor. I believe your truck uses fuel trims to calculate the ethanol percentage.

https://www.performancetrucks.net/fo...-497751/page2/

 

You have no sensor.

 

First off,

Let's start with your VIN? What is your VIN?

In order for the PCM to see true e85, you have to add the sensor. See below.

Gen III Flex fuel Write-up - LS1TECH