2018 exhaust back fire on cold start.

Hey everyone, kind of curious to see if anyone else with 2018 or newer have this issue. It seems that less than half the time I cold start my Tundra I get a back fire or "pop" from my exhaust. I originally had a flowmaster 50 series and it popped and now I recently switched to a flowmaster 40 series. And it still pops on cold starts. I've read that it's just trapped gasses in exhaust and it ignites on start up and there for you get the pop sound. It's very annoying and to be honest shouldn't be happening on a brand new truck. Anyone else have this issue?

 

Probably due to all of the stupid redirection baffles inside of flowshit mufflers. If it didn’t do it stock then it’s the aftermarket mufflers.

 

Flowmaster is one of the most popular brands. Quality may not be what it use to be, but no way I am the only one with this issue.

 

Had my 40 series FM for 3 years now and no issues.

 

Flowmaster just has great marketing and the fact that they design their mufflers to increase noise for cheap. Popularity doesn’t make it a great product. I have BAM exhaust on my 18’, which is basically a straight pipe design and my cold start ups are smooth as silk. The sudden burst of exhaust gas through the redirection chambers inside of the flowmaster is most likely the cause of the popping

 

My cold start ups are as smooth as silk.

 

Did you have this problem when the exhaust was stock?

 

Pics of exhaust setup?

 

No not with stock muffler.

 

I'll snap a pic and post it. But just basic setup with side outlet.

 

Need to see the pipes from FM to outlet tips.

 

My Corsa does the same thing on a warm start up. Never does it on cold start, I love it...Also backfires coming down a hill when I’m using the gears to hold me back. I give it a little gas then let off and it pops every time....

 

I have a 2018, no pops or backfires with the stock exhaust or the TRD system either...

 

I get it with my BA 8 inch single outlet exhaust once in a while. To me it’s no big deal.

 

I have dirty deeds 6" system and it happens from time to time on start up and like @Pinski when I'm using gears to brake. Doesn't bother me though

 

Mine does it occasionally as well. I like it! It doesn’t do it upon start up but it will do it if I’m on the gas and then off it when the truck is slightly cold driving down the street.

I have the BAM 6”

 

Same here, I kinda like it haha I cut my tailpipe at the axle turn down so maybe that makes a difference

 

That could have something to do with it. The OP has a side outlet. Which could very likely make it more prominent.

 

Agreed!! If there is an exhaust leak it can also cause the pop. Like a small gap where the gaskets on the pipe is can cause this. The cold can open the gap more due to contraction, then when Warmed up it will seal. If no leaks then it seems the TRD exhaust is in your future!!

I’m running the TRD and smooth as silk since day one. Not one backfire, ever.

 

I have this issue every once in a while. I had a 07 that did it to. I have a Pro now and the trd exhaust did it also but it not very loud and you probably won’t even notice unless you were listening for it. I had a Flowmaster super10 installed yesterday and I heard this afternoon. Sound like a backfire on start up. I think it’s some kind of gasses that ignite on start up.

 

Mine did it last night I kinda liked it, scared the shit out of my gf, I have a flowmaster super 44 it also does it when I’m going down a hill coasting and I lightly touch the gas pedal.

 

Same here I’ll have it in s3 or s4 and lightly tap the gas and it pops