I have a 2002 tahoe 5.3 with flex fuel and I was wondering if I could take away the flex fuel ability? I know it has different fuel pump, injectors, and sensors. The reason I am asking is because I have a bad fuel composition sensor and it will cost me $600 to replace and i wanted to know if it can be turned off through the pcm? In about a year and a half I am going to be doing a motor swap anway but I just want to know the easiest way out for the time being.

 

Is it just throwing a code? The code should be able to be set to "not report" in the PCM, and then disable a couple of tables in the PCM, but need to have a tuner do it, or have EFILive or HPTuners.

If you do that and just run regular gas in it, it would be fine.

 

This is the code it is throwing

P0178 - Fuel Compensation Sensor Circuit Low Input

So if I took it to most any tuner, should that person know what tables to delete? I just know that since its flex fuel it changes the timing and when I drive it constantly drives different. How much do you think a tuner would charge me just to delete the tables and code? Hopefully that will fix my problem.

 

I'm sure Jesse at waitforme performance could do it. He's a sponsor on ls1Tech. He's the cheapest mail order guy at about $158 I think and he would send you another PCM with all the appropriate things turned off. Would be cheaper if you sent him your PCM to tune, or sent yours back to him for a core. Unless you can find someone around you with tuning software, that's probable the cheapest solution.

 

You can tune it out. Either tell the PCM to ignore the code or have the spark tables for E85 and gas the same. So even if the PCM does get a bad signal from the fuel sensor, nothing will change. Just dont put E85 in it, lol.

Mine did the same thing. I found out the cost and said forget it. I deleted the code and it never came back. Oh well.

 

Thank you that was the answer I was looking for! Well now I just have to find a tuner somewhere in the middle tennessee area. But again thank you for your help!