Popping sound after start up.... backfire?

['fatboy']

Lately I've noticed that in the mornings when i start my car up and drive off, I hear some 'popping noises'. It fairly muted with the window up (even with the music off) so I'm not sure if this has always happened or if its a recent thing.

It only happens for the first minute or so and then nothing. I'm thinking it could be a backfire as I read somewhere on the US forum some people noticing a similar thing.

Anyone else have this happen in their car? Not sure how serious something like this is...

[Zuzu]

Originally Posted by 'fatboy'

Lately I've noticed that in the mornings when i start my car up and drive off, I hear some 'popping noises'. It fairly muted with the window up (even with the music off) so I'm not sure if this has always happened or if its a recent thing.

It only happens for the first minute or so and then nothing. I'm thinking it could be a backfire as I read somewhere on the US forum some people noticing a similar thing.

Anyone else have this happen in their car? Not sure how serious something like this is...

My car does that all the time when cold..

Its actually like a backfire from the exhaust..Mainly in first gear, if I take off down our short street and then slow down reaching the corner whilst its still in first without changing gears..
I assumed it was from the JB3.. Is your car tuned?

['fatboy']

Originally Posted by Zuzu

My car does that all the time when cold..

Its actually like a backfire from the exhaust..Mainly in first gear, if I take off down our short street and then slow down reaching the corner whilst its still in first without changing gears..
I assumed it was from the JB3.. Is your car tuned?

Mine's totally stock standard. I get it in first mainly either accelerating or when i lift (but without changing gears).

[Tj303]

i've posted exactly the same issue a while back...

http://www.1addicts.com/forums/showthread.php?t=261815

I have no issues with my HPFP so far which some ppl mentioned in that thread, and it still has that lumpy sound upon start up... i think it's normal. My car is stock.

[RadiuM]

mine at cold it misses quite noticably but once it warms up it gets better but still does it every now and often

it never runs perfectly smooth like I thought it should, I also have a fairly modified gtr with cams and it idles smoother, well, it doesn't miss.

The miss is quite noticable too when in the car, you can feel the car shake a bit. So i took it to the dealership.. its "normal".. sneh, its got a 3 year warranty so if it farks up, it farks up.

Next cruise I go on i'll listen to some other cars to see if it does the same thing as its hard to explain properly with words.

and yeah, my 135 is stock

[Zuzu]

Originally Posted by Tj303

i've posted exactly the same issue a while back.

Fatboys post and yours are different.. In your post Kevin, you where more concerned with the ruff/popping noise on start up.

Fatboys reference is to a backfire/popping noise whilst driving in the first few minutes... Which can occur from excess unburnt fuel being passed through the exhaust then igniting in the exhaust causing the backfire/popping sound.

[andrew@southernBM]

You do get some popping noise when the car is first started cold in the morning, more like a pop,mmmm,pop,mmm,pop type of thing, it shouldn't misfire at all and you should be able to accelerate without hesitation.

Trust me, when these bad boys misfire you will know it.

[aus135i]

Joe u need to hear mine in the morning... hahahahha

[Tj303]

Originally Posted by Zuzu

Fatboys post and yours are different.. In your post Kevin, you where more concerned with the ruff/popping noise on start up.

Fatboys reference is to a backfire/popping noise whilst driving in the first few minutes... Which can occur from excess unburnt fuel being passed through the exhaust then igniting in the exhaust causing the backfire/popping sound.

ok, mine seems fine when driving off... the only popping sound i've gotten when driving was in my XR5, the popping noise was actually a selling point for the car

[RadiuM]

Originally Posted by andrew@southernBM

You do get some popping noise when the car is first started cold in the morning, more like a pop,mmmm,pop,mmm,pop type of thing, it shouldn't misfire at all and you should be able to accelerate without hesitation.

Trust me, when these bad boys misfire you will know it.

Yep. Sounds just like that. Except it does it at idle no matter how warm it is and sometimes that pop is a big one, enough to shake the drivetrain and feel like someone has slammed their foot down on the floor in the car. Under load though, there are no issues which is why I'm not really fussed

Never use to do it when it was new. Probably started around 3 or 4 kkms.8 on the clock now

['fatboy']

sounds like a different type 'problem' to mine. this morning i was paying more careful attention to the popping noises.

What i can say is the at start up, idle and when moving etc, there is smoothness and no vibration etc.

It's probably as what zuzu described being unburnt fuel passing through.

The popping occurs actually when i lift from second gear after going up the hill on my street.

[Zuzu]

Originally Posted by aus135i

Joe u need to hear mine in the morning... hahahahha

Hope you are referring to your car Tim..

[aus135i]

hahhahahaha arrr yes i was