cooperthetrooper

my truck yesterday after i got gas started to backfire, did i just get some bad gas? i put 93 octane in it with a tune?

MikeGyver

iTrader: (5)

Backfired under what operating conditions? Did you run it on the tune before the new gas? What else do we need to know to help you?

cooperthetrooper

tune has been on it a couple months now, mostly at idle and low rpm backfires

cooperthetrooper

started spurtting pretty bad a low rpm today, im going to fill up with fresh gas hopefully thats all it was

adriver

iTrader: (1)

I have a generic 91 (cheap handheld) tune in mine. It does that some times when its cold, and I don't shift it smooth (5 spd). Is it a generic or custom tune? Also, isn't this summer fuel in some places?

cooperthetrooper

it is a custom tune, i have never heard of summer fuel

JoshC.

It's just the blend they use. Gas blends from summer to winter vary depending on region. In texas it's not as huge, now when talking e85 different ball game.

If your able to log it, I would just to see what it's doing. Could be tune or something mechanical.

MikeGyver

iTrader: (5)

Any results?

cooperthetrooper

everything seems to be fine now, had one spark plug that was cracked and a bad plug wire that had rubbed a hole in it, so far so good

darkirish63

iTrader: (5)

Cracked plug was most likely your culprit. Much more reasonable than the "bad gas" theory.