2007 Tahoe detonation

[maxwedge]

Blue, a few people I know have mistakenly or purposely tried e85 in non flex fuel cars, didn't get far before performance suffered, cel came on.When scanning it showed the pcm fuel trim algorithm could not compensate for that fuel.

[Stealthee]

I have seen cars destroy fuel systems by running e85. It deteriorates rubber and plugs everything it can with black gunk. Things that are rated for e10 and not flex fuel should not have anything higher than e10 put in them.

[Blue Bowtie]

I certainly cannot argue with any of those points. I've seen that kind of thing myself.

In this instance, the subject is a domestic 2007 Tahoe. I'm betting a tall beverage that 20% will not have any detrimental effects, FlexFuel or not.

[Blue Bowtie]

The worst fuel issue I recall encountering was back in the '80s in a late-'70s VW Rabbit with a diesel, and the owner mistakenly topped it off with unleaded gasoline. One injector pump and set of injectors later ($$$) and they probably never forgot to check again.

[ASJT3]

Folks, wanted to post back with the fix. Turns out it was a bad knock sensor, and I didn’t figure it out until was bad enough that it threw a code. Replacement of the knock sensor solve the problem.