White smoke after idling

timaloy
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White smoke after idling

Post by timaloy » 09 Aug 2016, 23:27

X5 2005 4.4 sports

Large puffs of white exhaust smoke after being in a traffic jam for 20 minutes or more,disappears once road clears,only happens after time idling,any hints

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M60NJP
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Re: White smoke after idling

Post by M60NJP » 10 Aug 2016, 07:30

Usually a sign of water - so anything from cracked head, blown head gasket etc to a small leak in/near the intake. Are you losing coolant or is it serously discoloured?

timaloy
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Re: White smoke after idling

Post by timaloy » 10 Aug 2016, 10:32

no ..coolents fine..i took it to bmw..for 4 hours...they could not find it,say they need a day with no promises,at £75 per hour :-s

i googled an USA site that said maybe valve seals (stem)...some say change my oil to a thicker one..i just wondered if any uk users had the same problems , I did not realy want to spend a grand simply to diagnose problem

timaloy
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Re: White smoke after idling

Post by timaloy » 10 Aug 2016, 10:36

M60NJP wrote:Usually a sign of water - so anything from cracked head, blown head gasket etc to a small leak in/near the intake. Are you losing coolant or is it serously discoloured?
if the above were so...would not the smoke be continuous....problem only occurs after idling in jam...once jam clears and i drive for a few yards ,problem disappears

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M60NJP
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Re: White smoke after idling

Post by M60NJP » 10 Aug 2016, 10:45

Not necessarily - a hairline crack or slpit in a gasket would let in tiny amounts of water (vapour) which you wouldn't see when moving and most likely wouldn't be visible either due to the small quanities relative to the exhaust emmissions. At idle though there isn't the air movement or exhaust volumes.

Valve stem seals, oil viscosity etc usually affect blue smoke (only) as it's engine oil being burnt alongside the petrol/air.

If you're not using coolant or oil and the car runs fine, I'd keep an eye on it, but nothing more. My previous 645 (same engine) used to puff a bit of grey/blue smoke at start-up (at 50k miles only) but never used engine oil or coolant..............and never missed a beat in the 4 years I had it!

timaloy
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Re: White smoke after idling

Post by timaloy » 10 Aug 2016, 11:18

cheers for info..to tell you the truth car runs very well...its just the embarrassing scenario of the car behind me getting covered in smoke when i pull away

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Re: White smoke after idling

Post by Simon14 » 17 Feb 2017, 19:22

Did you sort this issue? I just purchased an 2004 316ti es with the same issue?

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Re: White smoke after idling

Post by M60NJP » 17 Feb 2017, 19:24

Simon14 wrote:Did you sort this issue? I just purchased an 2004 316ti es with the same issue?
Totally different engine!!

Your is more likely head or HG, but - if you're very lucky -could be lack of use and will clear after a good run. Any white stuff under the filler cap?

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Re: White smoke after idling

Post by Lewy » 17 Feb 2017, 23:56

I'd be moving toward valve stem seals. There's a chap on Southside Sixers (Facebook) who has the kit for the N62 engine. I suspect it's the same?

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Re: White smoke after idling

Post by Maxwell » 18 Feb 2017, 06:21

Valve stem seals will give blue smoke as its burning oil,
OP you should get a sniff test and a coolant pressure test done.

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