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DISCO3.CO.UK > Faults & Fixes (D4)

DPF regeneration and gear fault / surging
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cosmic329
 


Member Since: 17 Dec 2013
Location: Chichester
Posts: 177

England 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4
DPF regeneration and gear fault / surging

I have a weird intermittent problem where very infrequently (5 times in 5000 miles) my D4 develops a on-off / on-off power problem. Feels like it is changing up and down gear and seems to occur at a constant speed or light acceleration. It seems to coincide with the engine making a very throaty exhaust noise as it does when regenerating the DPF. The effect can be quite severe at time like kangarooing when learning to drive a manual but goes as soon as I let off the throttle. Lasts for 5-10 mins and then perfect again. Exhaust noise back to normal.

There are no faults on the iid tool. Can't be reproduced easily so garage can't find anything. Any ideas?? Discovery 4 SDV6 HSE '65 - Projects in planning phase!

Discovery 4 SDV6 HSE '61 - gone
Discovery 3 Tdv6 HSE '56 - gone
Defender 90 Tomb Raider '51 - gone
Defender 110 XS '54 - gone  
Post #17878426th Mar 2017 2:05 pm
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dlgis
 


Member Since: 02 Oct 2015
Location: Tunbridge Wells
Posts: 398

United Kingdom 2012 Discovery 4 3.0 TDV6 GS Auto Indus SilverDiscovery 4

I had something like this last month in the middle of a 30 mile journey to work. Lots of weird gear changing and a bit like a bucking bronco round all the twisty country roads. Lasted about 10 miles and all fine again by the time i reached work. Assumed it was dpf related, and it hasn't reoccured since. Mine is also Indus silver, perhaps thats a factor Mr. Green D4 GS 12MY  
Post #17879436th Mar 2017 6:23 pm
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cosmic329
 


Member Since: 17 Dec 2013
Location: Chichester
Posts: 177

England 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Interesting. Mine is exactly as you describe. It feels like it is going into neutral but for a fraction of a second and can be a real thump when it comes back in if you are accelerating. I thought maybe the torque converter but it is so infrequent that I can't think what would cause it. I'll get a respray and see if that helps Rolling with laughter Discovery 4 SDV6 HSE '65 - Projects in planning phase!

Discovery 4 SDV6 HSE '61 - gone
Discovery 3 Tdv6 HSE '56 - gone
Defender 90 Tomb Raider '51 - gone
Defender 110 XS '54 - gone  
Post #17879616th Mar 2017 6:46 pm
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disco4.jasond
 


Member Since: 06 Feb 2017
Location: aspley, notts
Posts: 30

United Kingdom 2009 Discovery 4 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 4

me too. its so strange, when I come to a stop then press the accelerator nothing then warp drive with a bang. Shocked  
Post #178948710th Mar 2017 10:58 am
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cosmic329
 


Member Since: 17 Dec 2013
Location: Chichester
Posts: 177

England 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Hi disco4.jasond - and does yours only seem to happen infrequently and when the pdf sounds like it is regenerating? Notice yours is silver too...might be a pattern here Laughing Discovery 4 SDV6 HSE '65 - Projects in planning phase!

Discovery 4 SDV6 HSE '61 - gone
Discovery 3 Tdv6 HSE '56 - gone
Defender 90 Tomb Raider '51 - gone
Defender 110 XS '54 - gone  
Post #178949010th Mar 2017 11:10 am
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disco4.jasond
 


Member Since: 06 Feb 2017
Location: aspley, notts
Posts: 30

United Kingdom 2009 Discovery 4 3.0 TDV6 HSE Auto Zermatt SilverDiscovery 4

Hi cosmic. Not sure if I hear a noise to be honest as I have the radio on. Lol must be only silver discos that suffer from this strange behaviour. It hasn't done it for a while. Going to change engine oil this weekend and will have a look around to see if anything is out of place Question  
Post #179098913th Mar 2017 8:53 pm
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Grianaig
 


Member Since: 08 Jul 2014
Location: Tyne and Wear
Posts: 1286

Scotland 2014 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

My D4 is also Indus Silver but there has not been a problem. Then again the fact I don't use cruise control might explain it. I might read the manual and then give it a try. Laughing 2014 MY Discovery XS Indus Silver. Sadly gone. Second last LR of forty eight years continuous ownership.  
Post #18017969th Apr 2017 8:32 pm
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