Truck is a 2010 Escalade 6.2 AWD.
Has anyone ever encountered an issue where their truck is run very poorly, popping and backfiring, and dumping fuel all at the same time? I had this issue a few weeks ago, happened on start up then cleared itself rather quickly, then a week later it came back and stayed. I did a tune up, nothing, then changed a crank sensor and that seemed to have worked for a few weeks. Yesterday, same issue. Had to limp the truck home and noticed the gas gauge dropped significantly in the 3 mile drive. Starting to wonder if something is commanding the injectors to stay wide open. Didn't get a chance to use a noid light because it went back to normal as soon as I got home. Any suggestions. Only code thrown was a p0300 and a p0420. Has other body related codes for the suspension and brake switch.

 

Check ethanol % in the fuel and reset it

 

Something killed your cat, more advanced diagnostics is required with a bi-directional scan tool.

 

Probably fuel getting dumped because of his high ethanol content

 

unless Wawa is getting bad batches of fuel and I don't run e85, I doubt it.

 

You run e15 which is enough to throw the alcohol content out of whack. Just check it, seen it before on other trucks

 

I'll have to plug in hp tuners and see what it's reading.

 

And that is because of aftermarket oxygen sensors or factory ones that are beyond 100K miles.

We have also seen AFM failures take out cats before too.