[Keithlan1978]

Please please please somebody help me

Bought my 335d about 3 weeks ago, love the car it runs like a dream everything about it apart from one thing, once it gets warm (close to upto temp) I'm getting smoke coming from the exhaust on idle then when I rev it or if I take off an put my foot down it lets out some smoke but if not on idle I can drive it normally or floor it an get no smoke, the smoke is a white ish with a hint of blue

This problem is coming between me and my sleep cos the car runs like a dream apart from this smoke

A bit about the car, it's a 2007 dpf delete and remapped to 328bhp and 680nm torque, it's done 134,000 miles with full service history and never wanted for anything judging from the history and receipts

I've done around 250 miles in the car since I've owned it and it hasn't used a drop of oil on the dipstick

I've just changed the air filter today and tomorrow the crank case breather valve is getting changed which I'm praying will sort this issue out but I'm not confident that it will

Any other possibilities of what it could be or anyone had the same issue and what solved it?

I'm really thinking it's some sort of breather problem but can't be 100% certain

Also this ccv that's getting changed tomorrow is it just a case of straight changing the unit or does anything else need to be done? Thanks for any help

[PURE340i]

You might have a turbo seal leaking if the crankcase doesn't fix the issue.

[PURE340i]

It can also be a blocked CCV

[Keithlan1978]

Originally Posted by PURE340i

It can also be a blocked CCV

This is what I'm hoping that it's the ccv, it got taken off yesterday at a mates garage cos the new ccv was their but it was the wrong part so the correct one is coming today but when the old one was taken off their was nothing noticeable that it was blocked or anything

Would I be able to tell just from taking it off if it was blocked or knackered?

Also are turbo seals a big job and how would I check?

Thanks

[PerfectAce]

Owing to the mileage and symptoms, my money is on a leaking valve cover gasket.

[Keithlan1978]

Originally Posted by PerfectAce

Owing to the mileage and symptoms, my money is on a leaking valve cover gasket.

Heard that somewhere else, would that cause the symptoms I'm having mate?

[335stoner]

Originally Posted by Keithlan1978

Heard that somewhere else, would that cause the symptoms I'm having mate?

the problems you are having are a symptom

[PerfectAce]

Originally Posted by Keithlan1978

Heard that somewhere else, would that cause the symptoms I'm having mate?

The design of the M57's cylinder head has six of the twelve intake runners passing through the valve cover, meaning part of its gasket actually seals those runners off from the crankcase. A compromised valve cover gasket can result in oil from the crankcase finding its way into the intake runners and into the cylinders in very short order.

Check out this thread: https://www.e90post.com/forums/showthread.php?t=1456308 There's some links in there to pictures that will give you a better idea of the architecture.

Now, I'm not saying this is definitely your problem or your only problem, but I think it's the leading culprit.

[Keithlan1978]

Originally Posted by PerfectAce

The design of the M57's cylinder head has six of the twelve intake runners passing through the valve cover, meaning part of its gasket actually seals those runners off from the crankcase. A compromised valve cover gasket can result in oil from the crankcase finding its way into the intake runners and into the cylinders in very short order.

Check out this thread: https://www.e90post.com/forums/showthread.php?t=1456308 There's some links in there to pictures that will give you a better idea of the architecture.

Now, I'm not saying this is definitely your problem or your only problem, but I think it's the leading culprit.

Thanks mate appreciate the thread, that sounds exactly like mine the only difference being that mine seems to be once it's warmed up and not from cold, do you still think it could be the same issue

[PerfectAce]

Originally Posted by Keithlan1978

Thanks mate appreciate the thread, that sounds exactly like mine the only difference being that mine seems to be once it's warmed up and not from cold, do you still think it could be the same issue

Not every car's gaskets fail in exactly the same way in exactly the same spot(s) meaning that symptoms can present differently case-by-case.

One easy thing to check for is oil mess on the outside of the block. You might just spot evidence of your VCG leaking externally (the perimeter seal) in which case you'll know it needs replacement without too much effort or money wasted on the diagnosis. If there's evidence of the external/perimeter seal failing, then it's a good bet that the inner seals around the intake runners and injectors are in similarly poor condition.

[Keithlan1978]

Originally Posted by PerfectAce

Not every car's gaskets fail in exactly the same way in exactly the same spot(s) meaning that symptoms can present differently case-by-case.

One easy thing to check for is oil mess on the outside of the block. You might just spot evidence of your VCG leaking externally (the perimeter seal) in which case you'll know it needs replacement without too much effort or money wasted on the diagnosis. If there's evidence of the external/perimeter seal failing, then it's a good bet that the inner seals around the intake runners and injectors are in similarly poor condition.

I've actually just started the car up after it's been turned off for over 3 hours and getting the smoke on start up and when revving, the swirl flaps where done on it last week would anything of been noticeable then?

[335dlci]

Originally Posted by 335stoner

the problems you are having are a symptom

Sorry but this is funny. Yes a vcg can cause it.

[Keithlan1978]

Originally Posted by 335dlci

Sorry but this is funny. Yes a vcg can cause it.

Thanks mate gonna get it changed next week, hoping it's either the ccv or the vcg cos after that I'm out of ideas

[Yozh]

Did you define what kind of smoke you are having. White, blue, black?

[Keithlan1978]

Originally Posted by Yozh

Did you define what kind of smoke you are having. White, blue, black?

It's like a white with hint of blue mate I've got a video but won't let me select it to upload it on here,

I'm blanking the egr off as I've been told that can possibly cause it

I'm having a new crank case breather valve fitted Monday as been told this can cause it

Also my thermostat isn't working properly as car only ever get to between 66 and 72 when driving unless sat in traffic then it will go a bit higher but will come back down to mid to high 60s once driving again so this is getting changed in a few days as I know mpg is low due to this and also been told this can cause smoke aswel

[DG330]

Originally Posted by Keithlan1978

It's like a white with hint of blue mate I've got a video but won't let me select it to upload it on here,

I'm blanking the egr off as I've been told that can possibly cause it

I'm having a new crank case breather valve fitted Monday as been told this can cause it

Also my thermostat isn't working properly as car only ever get to between 66 and 72 when driving unless sat in traffic then it will go a bit higher but will come back down to mid to high 60s once driving again so this is getting changed in a few days as I know mpg is low due to this and also been told this can cause smoke aswel

Hi mate,

I’m having the same issue, but maybe more severe. I get a small puff at start up, then light smoke until warmed up when it’s constant until driven to clear it. Then it’s black smoke.

I am the same mods dpf, remap, swirl flaps delete, but egr in place. I’m going to be doing the rocker cover next weekend and making a thread with some vids if I have time. Fingers crossed it works.

My theory (which I hope is correct) I have a leak on the sump and rocker, with oil being pushed past ccv (new febi vortex in place). I’ve ruled out the turbo as been replaced last weekend. But, about a year ago and maybe 3 months before this came up as an issue - I blanked the swirl flaps as they were leaking! I didn’t have a sump leak, or one that’s as bad as now. So, my theory - blanking the leaking swirlflaps has meant that all my boost is now going to the cylinders, but has found the next place to cause a leak either into or out of the rocker ports. That’s what I’m hoping, but strange how this came about a few months after sealing the intake. Probably found the next best place to force its way out of.

Failing this it might be stem seals, but will do a compression test to check rings first.

If it is the rocker then I’ll be going for a good remap to adjust so this doesn’t happen again.

Also, if you do this yourself. Good time to clean your injector nozzles. I’m going to ultrasonic bath them with special injector cleaner for a good 10-15 mins until clean.

Let me know if you’ve got anywhere since your last post

[robnitro]

Swirl port block won't force boost like you are saying. It just makes both sets of ports stay open for air not just the small ones at low load/idle.

Valve cover gasket leaking can and does cause pressure issues but not so much at idle where boost is minimal. Follow this thread, and try what he did with the maf etc.

When smoking check your egt... And do the oil cap test with engine fully hot not cold

[DG330]

Originally Posted by robnitro

Swirl port block won't force boost like you are saying. It just makes both sets of ports stay open for air not just the small ones at low load/idle.

Valve cover gasket leaking can and does cause pressure issues but not so much at idle where boost is minimal. Follow this thread, and try what he did with the maf etc.

When smoking check your egt... And do the oil cap test with engine fully hot not cold

Haha that’s my hope gone then 😂

Will try the MAF later, do I just unplug then start up and take it for a little drive?

https://youtu.be/Wi8h7cl6raE

There’s a video of mine when hot, there’s also one when just started for reference.

[robnitro]

That looks fine. Your smoking could be related to the tune I'm not sure what the other guy found. Maf yes unplug when engine off, and try you'll get check engine but it'll run.

[DG330]

Originally Posted by robnitro

That looks fine. Your smoking could be related to the tune I'm not sure what the other guy found. Maf yes unplug when engine off, and try you'll get check engine but it'll run.

Now you mention it, I do remember unplugging both maf and egr and my smoke was a lot less. But that was black smoke. My cats smokes quite badly with both blue and black when on WOT. Even just half throttle between 1-2k I get some clouds of black.

Could this be a clue?

[DG330]

Just done it and yes it’s reduced with the maf unplugged and ran it all up to temp 94c

What does this mean?

[robnitro]

The tune could be requesting regen and using the throttle valve for managing egr and airflow. I'm not sure if you can unplug the throttle and drive but it's worth a shot