Popping coming from exhaust. Downshifting

**DorBink** · 10-23-2012 05:26 PM

Hi
I've noticed sometimes (not always) I get a popping sound from the exhaust when Im downshifting from 2 to 3 usually coming off the freeway. Just wondering if I should worry about this? Or does anyone know what this would be?
Mods: turbo back exhaust, cat less up pipe and I have had it pro tuned.
I never noticed this until I did the last mod for the up pipe and pro tune but I never noticed this immediately. Like 3 - 4 months later

Thoughts?

**nsibanez** · 10-23-2012 05:30 PM

How do you downshift from 2nd to 3rd?

Depending on what type of popping, more then likely normal. A lot of aftermarket exhaust sytems do this...don;t know why, would love to if someone wants to fill that part in

But worse case scenario it's misfiring. But you would throw a CEL if it's misfiring

**shadowpr** · 10-23-2012 05:35 PM

is it a little backfire?

**nsibanez** · 10-23-2012 05:44 PM

Originally Posted by shadowpr

is it a little backfire?

Sounds like it would be. Especially if there's no CEL codes.

**KronosPerformance** · 10-23-2012 05:59 PM

Catless downpipe?

**Terminal Kuz** · 10-23-2012 06:01 PM

You are probably running rich. Mine does the same thing but it depends on the mods you have and the tune.

**nsibanez** · 10-23-2012 06:03 PM

Beats running lean

Just out of curiosity, how does running rich cause it to pop?
I can see, kind of, without a tune due to the extra air flow causing the ECU to need more fuel, and eventually it gets a memory for this

**KronosPerformance** · 10-23-2012 06:05 PM

Originally Posted by nsibanez

Beats running lean

Just out of curiosity, how does running rich cause it to pop?
I can see, kind of, without a tune due to the extra air flow causing the ECU to need more fuel, and eventually it gets a memory for this

Excess fuel will carry along in the exhaust. Exhaust travels through the exhaust piping and fuel of course is flamable, so with a hot exhaust and fuel touching the piping, it will burn or pop.

**nsibanez** · 10-23-2012 06:13 PM

That's pretty cool. Personally, I like the sound =p

**Front Kick** · 10-23-2012 06:16 PM

I'm catless and getting backfiring all the time. AP Stage 2 as well.

**DorBink** · 10-23-2012 06:17 PM

Hi
No CELs. No misfire Yes cat less up and down pipes.
The tuner did state and I have the graph that he tuned it more rich bc he said it was running lean. I was figuring it was un spent fuel making it out into the exhaust. Typically happens in high revs from 3 to 2. Saying that I think it's odd that maybe I should change my spark plugs since they are about a year old. I figure that should improve ignition?
But overall based on the comments this doesn't sound like an issue

Thanks for all of the comments

**nsibanez** · 10-23-2012 06:20 PM

It really shouldn't be an issue. Wouldn't see why....lower gas mileage at the worst maybe?

**Terminal Kuz** · 10-23-2012 06:21 PM

Took a look at your profile to see if you listed your mods. Definetly because of what you are running i have pretty much the same mods on my Rex also stage 2.

**11blackwrx** · 10-23-2012 07:57 PM

yeah this is probably nothing more than backfire and not a major issue

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