[Draytonlad]

This is probably a silly question but here I go.
I have a 335i and when the car first starts and is parked only one of the exhaust pipes seems to be puffing. The car works fine when I move off.

[rsmallwo]

isn't there a valve that opens up at 2/3k rpm, this opens the other port up. There was a fix on my 130i that had you put a nail/golf pin etc in a vacuum hose and that ment it was always open

[dxb335d]

No port. Both should work together!

[The_Bear_Yid]

Lol at that fix, those type of 'fixes' are always funny.

[G82Dude]

Originally Posted by Draytonlad

This is probably a silly question but here I go.
I have a 335i and when the car first starts and is parked only one of the exhaust pipes seems to be puffing. The car works fine when I move off.

Does it "puff" from the right hand (driver's side) exhaust as you look at the back of the car and not the left?

[YvesD]

Perfectly normal, its supposed to do that as part of the emissions management.

Listen carefully and you will hear the valve opening up on the other exhaust when the car reaches its slow idle.

Yves

Originally Posted by Draytonlad

This is probably a silly question but here I go.
I have a 335i and when the car first starts and is parked only one of the exhaust pipes seems to be puffing. The car works fine when I move off.

[zltm089]

same here!/...

[wza]

I have previously read about this in other posts.

As already mentioned, is an emission thing, plus to reduce noise at high tick over. I think I also read it is possibly to let engine rev's get to idle.

Along with the golf tee fix, you can also disconnect something in the boot near one of the rear light fittings to stop it shutting off.

[m1bjr]

Originally Posted by Draytonlad

This is probably a silly question but here I go.
I have a 335i and when the car first starts and is parked only one of the exhaust pipes seems to be puffing. The car works fine when I move off.

Its nothing to do with emissions as such. The cats are all cold so are doing nothing anyhow.

When the car is cold and on enrichment (cold start) map, the NS exit pipe is closed.
The reason is primarily the noise, its very loud when cold and on fast idle.
I noticed after fitting the Bastuck pipes (no flap valve) how loud it is on a cold start.

You can pull off the vacuum pipe at the exhaust and plug it. But hardly worth doing as it only functons in cold starts or extreme cold weather.
Do NOT remove the electrical connection though, you may well find you generate an error code.

[dxb335d]

Diesel is different then. Both plume steam from cold.

Must look shit with only one doing it for while.

[toxicnerve]

It's why 335i exhaust tips are always dirtier on the right hand side too

[YvesD]

Originally Posted by dxb335d

Diesel is different then. Both plume steam from cold.

Must look shit with only one doing it for while.

It only does it until slow idle speed is reached from 1st cold start up. The revs drop in small increments from about 1200rpm initially.

If One is mechanically sympathetic, One shouldnt move off until the start up cycle is completed anyway

Especially with Auto.

[Sandwich_Dan]

Originally Posted by YvesD

If One is mechanically sympathetic, One shouldnt move off until the start up cycle is completed anyway

I always wait until the second pipe opens up, I figure that also gives the engine enough time to finish it's "odd ignition timing phase" (for want of a better name). I'm not keen on puting any load on the engine when it's firing at 30° past TDC.

[m1bjr]

Originally Posted by Sandwich_Dan

I always wait until the second pipe opens up, I figure that also gives the engine enough time to finish it's "odd ignition timing phase" (for want of a better name). I'm not keen on puting any load on the engine when it's firing at 30° past TDC.

Wow dood, thats just, like, retarded.

[charliesum]

undid my electrical point in boot passenger side behind lights and no error codes but makes it a bit boomy in low revs

[Draytonlad]

Well thanks for the replies everybody. The car starts on one orifice and then parps on both after a while. Nothing wrong with it and behaves just like its owner.