Car Back Firing?

[ginger]

Hey All,

My car has started back firing when changing at high revs.

Is this normal???

If not WTF...

Cheers

[Eug]

has it just started doing it?

have you done any mods recently to cause it? i.e. spark plugs, exhaust, timing, etc?

it's not exactly normal, but also not surprising.

the fuel mixture does normally run rich in the high rpm range.

[ginger]

my car does run heaps rich.

But no mods recently.

Its not a huge back fire, more of a burp

[r33cruiser]

more info...

is it a popping/continious popping on decelleration or gear changes?

or it a BANG between gears?

[ginger]

between gears, not a loud bang but certainly noticeble.

Just had me curious.

[inthisglass]

mine does it aswell, nearly all the time in 3rd.

its just because the fuel runs rich then when you put your clutch in all the unburnt fuel thats left sitting around pops.

its not a bad thing.. i personally like it as mine sometimes makes a tiney flame

when i get my safc2 and get the air/fuel mixture tuned it will stop this..

[ginger]

Awesome, at least its nothing to worry about.

If you want a flame check out Zorst on google. i think i may need to get one.

[BDC70T]

sometimes that happens when your cat has been gutted... justa thought

[ginger]

is there an easy way to check my cat. without cutting the pipe.

[Eug]

tap it/shake it to see if it's hollow.

backfiring (proper term afterfiring) normally degrades your cat.

[H@ME]

its the unburn fuel combusting in the cat which like eugine said can cause the cat to wear. IT not a major problem but it good to know for peace of mind.

[r33cruiser]

check the forced induction section man there was a technical write up about it..

basically your car is running rich.. when the fuel comes into contact with oxygen it creates a popping noise.

thats about all i can remember. but it is in the FORCED INDUCTION section.

[MissR34]

i get a popping/gurgling type noise everytime i go down gears.........................i like it

[342Four]

thats called overrun

thats different to backfiring cause the engine is at high-ish revs, but there is no real load on the engine, and so it revs without using the accelerator

there is an excess of fuel in the burnt mixture because of the closed throttle, and when it hit the cat converter it mixes with a bit of oxygen and self ignites

thus the pop/gurgle/burping noise

backfiring is like a full on ignition of fuel/air mixture partially in the engine and in the exhaust - thats why its loud and bad for your engine

[ginger]

I love my NA,

Going threw shopping centres as your slowing down, makes all the burping and dull popping noises.

Every one looks

[ignuz]

I love my NA,

Going threw shopping centres as your slowing down, makes all the burping and dull popping noises.

Every one looks

grrrr lol while I sit at home on Fridays when I don't feel like spending cash going out bored out of my mind hahaha

edit: Yea the only part of the exhaust that was still stock was the cat. So in the future if you ever wanted to upgrade something I'd look at getting a high-flow cat maybe, but yea it sounded and went nice anyway =P

Also have you done anything new to it?

[ginger]

grrrr lol while I sit at home on Fridays when I don't feel like spending cash going out bored out of my mind hahaha

edit: Yea the only part of the exhaust that was still stock was the cat. So in the future if you ever wanted to upgrade something I'd look at getting a high-flow cat maybe, but yea it sounded and went nice anyway =P

Also have you done anything new to it?

Just a few little things here and there.

Changed the gear knob pretty much straight away, has a gt nismo titanium on there now, lining up a new clutch soon, and also suspension. but besides that, shes still the same from the day i drove away.

Hows your legs going for transport?

[ignuz]

Just a few little things here and there.

Changed the gear knob pretty much straight away, has a gt nismo titanium on there now, lining up a new clutch soon, and also suspension. but besides that, shes still the same from the day i drove away.

Hows your legs going for transport?

Ahhh they go ok, thinking of lowering them a little and putting some 18's on there :laughing-smiley-014:

[ginger]

start rolling on 20's

Edited January 24, 2008 by ginger

[10MinuteCar]

more info...

is it a popping/continious popping on decelleration or gear changes?

or it a BANG between gears?

If its popping on decelleration or gear changes, whats the cause of that? the BOV?