Occasional popping in the exhaust is normal.

 

O5 STI back fires when boosts low inbeteen 1-2 gear if i spool just a bit and shift slowly.like i was to get on it a bit and i see a cop..i get a nice one..not ot pingish more low tone like timing....weird .i get 15 mpg and it smells like gas..bought car new this started after i put a catback on. (could be a exhaust leak i was told) put intake on asuming it was running rich cause sti's run rich didnt do anything.. my car is stock.. with BOV,intake ,exhaust. dealer said my ecu needs to be flashed they have been having problems with this before..as long as ur not pinging ur ok but get it looked at asap cause u will ware out stuff over time...rings, valve guids..im sure my sparks r gone.. but she runs great...anything that to much gas can do....

..THE.ONE..

 

15,000 miles ..... its timing ..its an ecu problems..or exhaust leak..

try to reset ur ecu if it gets worse, i reset mine and it slowly get worse then i reset again.

need that back pressure otherwise......pop..pop...

 

Timing......all the gas isnt burning


do u smell it when u first start her up cold.....or when u been driving..when does this happen....

i get mine when its cold or sits for a day or so..

a backfire is timimg issue has nothing to do with that..if it was ur filter u wouldnt ping or backfire cause its not a lack of fuel...airfilter.. it would make a difference cause ur applying more air to the mixture inwhich the mixture would lean out...but we have ecus. so after u do all this reset ur ecu...ecu's are a pain in the ***.

 

thats the dumbest ive heard did u read what u wrote....ya it might be occasional if ur downshifting and hitting 5k lol or if its cold...or if you poored water in motor...

 

WRX's will run on half a cylinder so dont mess around if u have a problem attend to it asap but always reset ur computer when u make mods because u can make it worse

DONT GIVE ANYMORE ADVICE BAN SUV

 

:rotfl:

 

whats that for....ur wrong..no car should ever backfire unless u are at real high R's and u just let it decel in gear.

 

Since every Subaru made in the last fifteen years does that, and most of the users of this board "rev to high R's" and then engine brake, why shouldn't they pop? You seem to have a strange definition of "never."

 

my L backfires alot, (out of the exhaust, even flames im told) but thats because of the managment im using, and the lack of cats, every subaru that i have ever driven has backfired out of the exhaust (i work at a subaru dealer)...i sawulook..gtfo and go back to your sti area, this is the n/a forum, and you have NO F*CKING CLUE of what you are talking about. back on topic, check your fuel pressure regulator!

 

^^^ +100, and not a lot of peole have the ***** to flame on a staff member ISawUL00k, prob cuz they "disappear"....hmm....

 

Wrong site rau.

 

thats right, im thinking nabisco.... :rotfl: meh bad

 

u freaking magazine mechanice **** me off. ive been building cars for 20 years so i do know what im talking about....

Just returned from subaru dealer my buddy is the tech here in Santa Cruz..The WRX not STI has a logic board issue..#3 according to their computer..The sub tech site stated that 5 speed wrx will backfire on decel between 2000-5000 rpms. so shut up and eat some. it is a timmin/ECM issue not a stupid fuel regulator u wannabe....


Had My ECM reset..car went formm 230 Mile Per Tank to 270.... and the backfire stopped..

 

First off, if your mechanic tells you that your car was backfiring and he fixed it, you need a new mechanic. That's because no Impreza ever made has actually BACKFIRED. That requires a carburetor, and a badly tuned one at that. What this thread is describing is best referred to as "afterfiring." It just means that not 100% of the fuel mixture burned inside the cylinder, and instead ignited when it touched some hot piece of exhaust. Since this a board full of "magazine mechanics" most people don't bother to correct such common inaccuracies, just like when people refer to the US Impreza RS as a GC8 or a stabilizer bar as a "sway bar." Your mechanic however, should know better.

As for my statements, I stand by them. Subarus, even the non-turbo applications, tend to run rich. This greatly increases the frequency of unburned fuel making it to the exhaust. Lots of people first notice the popping after adding a new catback or full exhaust. The exhaust does *not* cause the popping, it just takes away the ultra-quiet OEM exhaust enabling the driver to *hear* it for the first time. Some popping with little or no throttle is normal, period. Nobody had said anything about a "fuel regulator" or any other cause of the so-called problem, so stop telling us we're wrong and don't know what we're talking about. If you're gonna bother responding to this, try to leave the attitude out of it. This forum is for technical discussion, not internet special olympics. If you still want to debate the topic by claiming that your 20 years of "building cars" makes you more qualified than anybody else here to discuss this issue, try to be a little more specific. Lastly, your statement that you got an extra 40 miles out of your last tank of gas is meaningless. Unless you post up your average fuel economy in the standard unit of miles per gallon, you could simply have burned 2 more gallons of gas. And, even if you DID get the extra 40 miles on the exact same amount of fuel, how does your ECU reflash which changes how your car runs have bearing on this issue? You're telling us that the one and only subaru you've ever known to experience the popping had it go away, so the rest of us must have broken cars and not know it because of our ignorance? Please.