Back Fire

[trafficman337]

I have a 2018 Super Crew with just about 3000 miles on it. I burn mid grade, 89 octane and have a Borla Atak Exhaust on it. Love the truck. The last three tank fill ups, when I leave the station the truck back fires loudly until I stop and shut it down for a while. Once it is restarted, no back fire and performs very well. Anyone else running into this issue? Should I be worried about it? Last Saturday, the backfire was so loud it had dogs on Main Street howling!

 

[aalonso]

I get the same at every fill up with 93 octane, once I take off accelerate to 40-50mph then let go the gas pedal and it back fires 2-3 times then it stops! Got the Borla S-type! Got 18,800 Miles! No issues


Sent from my iPhone using Tapatalk

 

[Sozzy12]

I know some of the 3.5s in F-150s are known for fouling plugs... Not sure if the issue has been addressed in the newer or Raptor variants, but bad plugs could cause the misfire/back fire.

 

[Jeff-Ohio]

I have a 2018 Super Crew with just about 3000 miles on it. I burn mid grade, 89 octane and have a Borla Atak Exhaust on it. Love the truck. The last three tank fill ups, when I leave the station the truck back fires loudly until I stop and shut it down for a while. Once it is restarted, no back fire and performs very well. Anyone else running into this issue? Should I be worried about it? Last Saturday, the backfire was so loud it had dogs on Main Street howling!

I have the exact same issue after every fill up. I will get a few backfires for the first few miles when coasting to a stop and then the problem goes away until the next fill up.

 

[SuperAwesomeNinjaCowboy]

I have a Corsa Extreme, and thought the issue was with the Pedal Commander i had installed and posted in the Pedal Commander thread. Since removing the pedal commander its done it once in about 800 miles but I can't say if it was after filling up. All my backfires happened at moderate speed, 15-35 mph and coasting.

Im wondering if the backfires are always there and just more noticeable with the modified exhausts. Jeff-ohio, do you have a modified exhaust as well, i was thinking i saw one of your threads addressed some resonance issue.

 

[smurfslayer]

I’ve noticed the phenomenon on my bikes before, where the backfire or popping on decel is much more pronounced with high flow or no cats, and a less restrictive exhaust. I was on a dyno once after some engine mods on one of my bikes. The initial run was great, but on deceleration the bike was shooting flames 10-15 feet out the back.

I asked if I could keep that feature but the tuner said my a/f was way off. No.

 

[Guy]

You say it’s after fueling.
I have the FOMOCO touring. SPD worthless adapters, CAI, Tune, intercooler...

No backfires.

But I’m wondering if your isssue isn’t a temporary lean condition related to some kind of vapor lock issue with your fuel filler, neck, etc.

 

[nikhsub1]

I've experienced this too on a bone stock truck, the first time I filled up...

 

[SilverBolt]

100% bone stock and I get it with each fill up. Has to be something with the vapor recovery system.

 

[Jeff-Ohio]

I have a Corsa Extreme, and thought the issue was with the Pedal Commander i had installed and posted in the Pedal Commander thread. Since removing the pedal commander its done it once in about 800 miles but I can't say if it was after filling up. All my backfires happened at moderate speed, 15-35 mph and coasting.

Im wondering if the backfires are always there and just more noticeable with the modified exhausts. Jeff-ohio, do you have a modified exhaust as well, i was thinking i saw one of your threads addressed some resonance issue.

I do have a modified exhaust (Corsa Xtreme).