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CSK

Member Since: 15 May 2019
Location: St Tropez
Posts: 41

2016 Defender 90 V8 Petrol Works V8 Auto Indus Silver

Was my DPF regenerating?

While driving back from the French Alps yesterday I noticed a strong smell and smoke coming out of the exhaust.
This happened when I was in very slow moving traffic.
I noticed the engine temperature was very low and the smell in the cabin was unbearable to the point I had to open the side window.
Was this the DPF going through a regen cycle?
I thought this would only happen at certain speeds?
No DPF warning light on the dashboard.
The smoke I was leaving behind was somewhat embarrassing.
After a while the smoke and smell disappeared, the engine was at normal operating temperature and the rest of the journey down South, the car was running impeccably.
Oil level was OK too.
Very strange.
Anyone knows the reason of temporary smoke and smell?

1st Mar 2020 6:37pm

Balvaig

Member Since: 19 Feb 2016
Location: Fife
Posts: 719

2016 Defender 90 Puma 2.2 Landmark LE Corris Grey

Only noticed a regeneration the first time it happened from new, when I got a strong smell of hot metal.
It might be worth checking if any oil has spilled/leaked onto the DPF. This would account for smoke and fumes.

1st Mar 2020 7:56pm

JOE_130

Member Since: 26 Nov 2014
Location: Chelmsford
Posts: 104

2015 Defender 130 Puma 2.2 HCPU Java Black

A DPF regen will increase the visible exhaust emissions but certainly not to the extent you describe, and not enough to notice while driving. Puma Defenders are quite obvious when they do regen, the engine note will vary and become a lot harsher and if they're in the post injecting phase you'll hear a sound I liken to "twanging" a ruler over the edge of a desk. This is the noise the injectors make when they inject in to ambient air pressure (to dump fuel down the exhaust for the regen).

When you do a "static" regen which is initiated by a diagnostics tool and there's no speed to blow the fumes away you'll see white/yellow tinged smoke out of the exhaust but nothing extreme. Does sound like something touching the exhaust, or a failed exhaust gasket. I'd have a good check over it to make sure the exhaust isn't blowing at all. The smell in the cab will have been made 100 times worse as TDCI heater boxes don't seal against their intake pipework so they pull in a lot of air from next to the engine. You don't want to be breathing in exhaust fumes if the exhaust is leaking!

2nd Mar 2020 12:20pm

ickle

Member Since: 22 Jul 2010
Location: South Vendee
Posts: 1727

2008 Defender 110 Puma 2.4 CSW Alpine White

EGR valve stuck? Does it chuga chuga chuga when switching off?

2nd Mar 2020 12:45pm

CSK

Member Since: 15 May 2019
Location: St Tropez
Posts: 41

No, everything normal before and after the fume and smell sequence. I did the entire trip from the Alps to the South of France, the car ran as smoothly as ever. I'll bring it up with my friendly stealer.

3rd Mar 2020 1:09am

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