Blowing white smoke under load towing

[AussieAnth]

This problem just started in the last week.
2013 MN manual dual cab. 105k on the odometer.
Has Provent 200 catch can, Dyno tune since 2017. Have towed 1.5tonnes before no drama.
Only change recently is did a mid service oil change without changing the filter. Also upsized to 265/75/16 mt’s recently.

Xmas morning I towed my new camper, about 2tonne all up, 2hrs from Melbourne to Bendigo. Wasn’t flogging it. I didn’t notice anything but when I pulled into my folks place, someone noticed I was blowing bit of white smoke as I slowly approached the back of the block. Had driven about 10min at city speeds once leaving highway.
Over next couple days I drove around town and out to a lake 2 times and others in convoy saw no smoke.

Yesterday I towed again 3hrs further north. Can’t notice smoke at highway cruising speed but when I slow down in town and back off the pedal, quite a lot of white smoke pours out of the exhaust for a minute or so.
If I stop and idle, after about 3min, things cool down and the smoke returns to normal idle. No excess smell or smoke visible.

Thought I had over-filled the oil perhaps, but checking this morning its middle of the dip stick min/max holes.

Currently at caravan park in small town for the next few days. Any suggestions on what to check or what the cause could be? Checked with OBD2 reader with no codes reported.

[L200Shogun]

White smoke is bad seek professional help.
Un burnt fuel which can burn holes in pistons
Injector issues
Turbo issues (turbo shagged) also check hoses
Valve timing
broken rings
Coolant leaks can also do it
etc

[AussieAnth]

White smoke is bad seek professional help.
Un burnt fuel which can burn holes in pistons
Injector issues
Turbo issues (turbo shagged) also check hoses
Valve timing
broken rings
Coolant leaks can also do it
etc

Thanks, appreciate it.
1 question. I would have thought unburnt fuel produces black smoke. I'm no expert obviously.

[NowForThe5th]

I would have thought unburnt fuel produces black smoke.

Depends on how "unburnt" it is. Excess fuel usually produces black smoke. White smoke usually comes from condensation, when seen at startup and while warming up. Once warmed up white smoke is usually an indicator of water in the exhaust, like you'd get from a blown head gasket or, (ahem) a "cooling system service" issue. Have you checked coolant level?

I'd think that holes in your pistons are probably unlikely but the way it's happening after being under load seems to indicate that this may be just the beginnings of a problem and you may have noticed it in time.

[AussieAnth]

Coolant levels are ok but I'll monitor until I can get back to Melbourne and get it more seriously looked at.

I also recently run a can of LiquiMoly Diesel purge though the firm lines. Not the first time I've done it.

Also forgot that i run an egt monitor and temps at the dump pipe peak at around 570deg under full load towing up hill. I think that's about typical.

[AussieAnth]

I would have thought unburnt fuel produces black smoke.

Depends on how "unburnt" it is. Excess fuel usually produces black smoke. White smoke usually comes from condensation, when seen at startup and while warming up. Once warmed up white smoke is usually an indicator of water in the exhaust, like you'd get from a blown head gasket or, (ahem) a "cooling system service" issue. Have you checked coolant level?

I'd think that holes in your pistons are probably unlikely but the way it's happening after being under load seems to indicate that this may be just the beginnings of a problem and you may have noticed it in time.

Another thing worth mentioning. I run a Donaldson 3 micron pre filter and few days before leaving i ran a can of LiquiMoly Diesel Purge. Have done before without issues. Possible the Pre filter could be restricting flow under heavy load or somehow Ive affected the injectors ?

[DibbyDibbyDJ]

I would have thought unburnt fuel produces black smoke.

Depends on how "unburnt" it is. Excess fuel usually produces black smoke. White smoke usually comes from condensation, when seen at startup and while warming up. Once warmed up white smoke is usually an indicator of water in the exhaust, like you'd get from a blown head gasket or, (ahem) a "cooling system service" issue. Have you checked coolant level?

I'd think that holes in your pistons are probably unlikely but the way it's happening after being under load seems to indicate that this may be just the beginnings of a problem and you may have noticed it in time.

Unburnt fuel that has had no change of igniting is normally white, and incompletely burnt fuel due to insufficient air will be black. The only time i have seen white smoke from a diesel was 1/ head gasket 2/ holed piston or broken valve or 3/incorrect fuel