Cold Start..

B

Burple

Member
Hi all,

I've had a quick search on the forum, and a wider trawl of google and I *think* I know the answer to my question, but can anyone on here give a definitive answer?

Is it a "feature" of the e89 (18i - or in fact any of the 2.0 turbo direct injection engines) sound rough as a bag of badgers @rses for a bit after a cold start?
google says pretty much yes, but I thought the proper experts could probably settle it.

when I say rough, I mean kind of like a blowing exhaust. give it a blip of throttle, noise goes, then resumes when back at idle.. last for a bout 20 - 30 secs after cold start up.

Cheers!
 
Burple said:
Hi all,

I've had a quick search on the forum, and a wider trawl of google and I *think* I know the answer to my question, but can anyone on here give a definitive answer?

Is it a "feature" of the e89 (18i - or in fact any of the 2.0 turbo direct injection engines) sound rough as a bag of badgers @rses for a bit after a cold start?
google says pretty much yes, but I thought the proper experts could probably settle it.

when I say rough, I mean kind of like a blowing exhaust. give it a blip of throttle, noise goes, then resumes when back at idle.. last for a bout 20 - 30 secs after cold start up.

Cheers!
Click to expand...

Yep, they do that-I think it's the air pump keeping the emissions low on cold start?
Rob
 
On cold start the car alters the VANOS positions which changes valve timing to heat up the cats quicker. You can disable this in the DME.

VANOS position alters the tone of the exhaust quite significantly. Duration is usually between 45 and 60 seconds.
 
Found this topic really useful thank you :)
I've just bought my first Z4 and never noticed this noise the two times I test drove the car, but the first time started at home sounded awful and had visions of needing a new exhaust straight away!!!
 
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