HELP - URGENTLY NEEDED
HELP - URGENTLY NEEDED
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Discussion

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
My 535d just started spouting plumes of smoke from the exhaust and is now making a clunking noise. There now looks to be chalky residue in one of the exhaust pipes. Does anybody know what this could be please?

roofer

5,136 posts

241 months

Wednesday 25th August 2010
quotequote all
Smoke or steam? Colour?

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
It was a dark greyish colour smoke coming out of one side of the exhaust. Then a white/greyish chalky residue came out when I revved the engine.

miniman

30,131 posts

292 months

Wednesday 25th August 2010
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Fuelled it up recently?

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
I filled the tank about 10 days ago and have about half a tank left. Its going to cost me 40 quid to have it towed to my local garage so wondered if I should just drive it there or save any more damage being done.

miniman

30,131 posts

292 months

Wednesday 25th August 2010
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I was thinking it might have been filled with petrol. Personally I would have it towed.

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
No its definately not had petrol put in it. Any other ideas? I'm praying its not the turbo. Could it be the CAT?

briers

873 posts

209 months

Wednesday 25th August 2010
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Grey type ash is normal, means the air fuel mix is correct.

However if the smoke is white it could be a sign of a blown head gasket or even a cracked cylinder head.

I'd say it's unlikely to be a turbo but don't drive it, just in-case it is. The engine could run away with it itself and burn oil and completely seize wrecking the whole engine.


As i said, it's more likely to be a head gasket. Do you see any frothing or deposits in or around the coolant reservoir in the engine bay?


Was the smoke blue in any way? This could indicate a faulty seal, you would have noticed a burning oil smell too tho.

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
briers said:
Grey type ash is normal, means the air fuel mix is correct.

However if the smoke is white it could be a sign of a blown head gasket or even a cracked cylinder head.

I'd say it's unlikely to be a turbo but don't drive it, just in-case it is. The engine could run away with it itself and burn oil and completely seize wrecking the whole engine.


As i said, it's more likely to be a head gasket. Do you see any frothing or deposits in or around the coolant reservoir in the engine bay?


Was the smoke blue in any way? This could indicate a faulty seal, you would have noticed a burning oil smell too tho.
Nothing unusual in the coolant reservoir and it was still up to the max line so wasn't losing water.
A friend of mine thought the head gasket might be the problem when I called him but I thought not because its only done 62000 (although that doesn't mean it couldn't). The smoke was def more grey than white. How much am I looking at roughly if it is the head gasket?

briers

873 posts

209 months

Wednesday 25th August 2010
quotequote all
I don't know prices, sorry

Is this grey smoke constant? Realistically how much is there? Massive plumes or just exit smoke?

DPF regen is not uncommon. You would expect very fine grey ash to exit after a regen. have you noticed a sweet burning smell or excess heat recently? Maybe even poorer fuel consumption or slightly less power?

Good sign that the coolant is still bobbing at the right level. If it was the turbo I'd expect bluer smoke and turbo seals wouldnt normally create residue and it would smell of burning oil. If it was the head gasket the coolant bob would sink as coolant would be lost. Coolant burn also smells distinctive.

Have you been in alot of traffic recently?


Edited by briers on Wednesday 25th August 22:33


Edited by briers on Wednesday 25th August 22:35

leerid

Original Poster:

11 posts

194 months

Wednesday 25th August 2010
quotequote all
briers said:
I don't know prices, sorry

Is this grey smoke constant? Realistically how much is there? Massive plumes or just exit smoke?

DPF regen is not uncommon. You would expect very fine grey ash to exit after a regen. have you noticed a sweet burning smell or excess heat recently? Maybe even poorer fuel consumption or slightly less power?

Good sign that the coolant is still bobbing at the right level. If it was the turbo I'd expect bluer smoke and turbo seals wouldnt normally create residue and it would smell of burning oil. If it was the head gasket the coolant bob would sink as coolant would be lost. Coolant burn also smells distinctive.

Have you been in alot of traffic recently?


Edited by briers on Wednesday 25th August 22:33


Edited by briers on Wednesday 25th August 22:35
Thanks for this. It was only for about a minute that the smoke was coming out but there was a lot of it. Then when I came to a halt there was a juddering which seemed to go through the middle of the car and a clunking noise. Its got me totally stumped but it doesn't sound good.