First post so please be gentle with me. M62 4.4 FF as hopefully shows. Read/learnt lots from this forum in the few months of l322 ownership despite thinking I would never move up from a P38, having said same about Classics.

Where to start....

Issues abound but slowly getting there. Wondering if any of you have thoughts on visible smoke pouring into the cab through both central air vents when reversing. Smell of burning oil and reverse was slightly up hill.

I'm thinking the pcv/breather pipes but any other thoughts welcomed. There has been a general burnt oil smell but this was proper visible white smoke.

Many thanks.

Smoke or vapour? I only ask as i had the exact same experience, but it was the cold air coming from the air vents causing the visible vapour.

It was smoke/vapour in terms of being white coloured and clearly visible with the burnt oil smell. I don't think something like water mixed with air as it was quite heavy smoke and the smell was bad.

I'd also been driving for say 30mins with air from the vents hot and of course the car fully up to temp.

I guess I need to start looking at where the air goes into the venting system. I'd read that leakage pcv/pipes can drip on the exhaust so wondered if it was feasible this could be sucked in and cause the smell generally, but then be a lot worse when the circumstances are ideal, as in going down-hill, braking and then reversing back up.

I get a burning oil or a diesel fume type smell when I reverse back into my drive sometimes - it's more noticeable after a longer run.

Had the DPF Full message over the weekend - cleared it - so wondered if it was this.

Thanks GAC23. Whereabouts is the DPF located? If the back of the engine as the PCV on the petrol or similar position then I guess it suggests the fumes can make their way in.

I've replicated it a few times now and it is just worse when reversing and present all the time I think.

err, you dont have a dpf sir [diesel particulate filter] ... - .- -.




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No DPF on a 4.4.

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I should have looked at the car description before making that post - sorry.

Can anyone help me re my smelly reversing?

Fully aware Stan; just wondered if it was in a similar position to the pcv on the petrol as I said.

How about blower fan or Final Switch Relay (fsr) going bad?. Is it burnt oil or possibly burnt wire insulation?

It does have an oil smell which although I would have initially said burnt trans oil my father in law was in no doubt it was engine oil and I have to bow to his 'nose'. I do think right though and if the theory of the pcv/pipes dripping in that direction, I can see how reversing would create the draw.

Whilst there is something running constantly behind the central vents/ console, it's not a wire/plastic smell.

It is using a little oil but just wondered if this issue factored with others whose pcv/pipes had gone/leaking.

Diesels need not apply to save confusion!

Just reverse is what confuses me. Seems if the PVC lines or any other lines had enough leak to produce white smoke in enough quantities to overwhelm the cabin air filter you would see it in forward too. Have you tried recreating it, quickly parking, and popping the hood(bonnet) to see any smoke in the engine bay?

It is possibly lightly there all the time,but the visible smoke was when reversing and the smell does also appear stronger when going backwards too. It's less with the central vents closed. The engine (and heater regardless of setting) does seem really hot but it's within parameters when checked (the engine that is). No visible smoke from under the bonnet.

I guess I need to do more to narrow down. I had hoped someone would say that was their experience too when their pcv/pipes were leaking too. Being lpg converted getting to the back is impossible without stripping down.

My theory is you have an oil leak on exhaust or manifold. Backing up keeps the airflow from moving the smoke out of the engine bay. If you are convinced it is an oil smell it probably is. If it reduces with outside air cut off it is coming from outside the cabin. These engines run hot but generally oil to smoke needs more heat like the manifold or exhaust pipe. Find the stains on one of these. Also try lifting hood(bonnet) and drive backwards after the engine has been run for a while. See if it reduces the cabin smoke.

Thanks doclees, I do agree with you and will do as suggested.

The plugs need changing which will require all the lpg gear shifting so I'll get down the back and will have a feel.