 | Home > Puma (Tdci) > 2.2 engine 'hunting' on startup idle |
 
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2162  
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Not sure if related but my old mans 07 l322 was doing the same, turned out to be a dodgy EGR valve.
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12th Jan 2018 5:11pm |
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| agentmulder Member Since: 16 Apr 2016 Location: Outer Space Posts: 1324 
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VCV possibly, although I do wonder how many good ones have been swapped out unnecessarily ... (and how many dud ones remain installed!).
I know that on mine the occasional idle hiccup is only apparent when AC is on, took a while to figure that one out. Solved the bowel problem, working on the consonants... |
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12th Jan 2018 8:57pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8021  
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could be poor fuel? do you use branded or supermarket?
recently was caught short and put in Tesco fuel mpg fell through the floor and it hunted on a cold start cold day. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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12th Jan 2018 9:13pm |
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| LCJ Member Since: 07 Sep 2009 Location: UK Posts: 201 |
Thanks all, I’ll mention it to the dealer. Fuel is whatever is best priced and to hand so it’s had a mix of branded and supermarket-it doesn’t seem to make a difference
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13th Jan 2018 8:24pm |
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| TOP5N Member Since: 03 Nov 2015 Location: Gloucester Posts: 226 
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I have noticed the past couple of days that mine was doing it too (2015 my) i only use premium diesel (v-power diesel or BP Ultimate)
It is very slight but just about noticeable. |
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17th Jan 2018 7:55pm |
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| Jerry Member Since: 13 Nov 2015 Location: Cardiff Posts: 196 
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^^^^My MY2015 does this as well. Run on premium fuel. I actually notice it more at 'in between temperatures' - not when freezing cold, and not when nice and hot - but in-between these two.... LR have tried software updates which may have helped a bit, but very occasionally I still see the revs fluctuate on idle. My independent didn't think it was VCV and thought most likely to be software related. His words were.... 'its not a Mercedes'..... so I'm not pursuing this anymore, as it runs great and disappears as soon as I blip the throttle. Please let me know if you resolve this. thanks. Jerry
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25th Jan 2018 11:01pm |
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| zsd-puma Member Since: 09 Aug 2016 Location: Kent Posts: 2720 
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Do you do a lot of short trips? I find m7 2.4 is noticeably smoother after its been on a good run. It'll stay that way for a few days until it's had a few short trips again.
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26th Jan 2018 2:04am |
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| Jerry Member Since: 13 Nov 2015 Location: Cardiff Posts: 196
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Yes, I do lots of short trips which is one of the reasons that I use premium fuel. I understand that the DPF regeneration process needs longer high temp runs, so I minimise the junk deposited by using better quality fuel. I try and get a few longer runs in occasionally to try and help it clean itself. Runs great - just v. occassional slight irratic idle on starting at 'in between' temperatures.
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26th Jan 2018 11:00am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2638  
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Mine started doing this in winter, with large clouds of white smoke.
Replaced the VCV, and it improved a bit, but didn't go away completely. I did the re-learn, pilot correction, etc., even got the new BAS remap. My mechanic says the injectors are on their way out even though they were removed, inspected, and sent for testing, which revealed all in spec. Then summer arrived and the symptoms disappeared, so I will wait until next winter to see what happens... -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged 
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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26th Jan 2018 11:27am |
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| wyvern Member Since: 13 Dec 2009 Location: Cornwall Posts: 2105 
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maybe need a long run to do the ReGen thing with engine - mine does lots of long runs normally, but I did find that the engine was not as smooth after a week or so of short runs in slow traffic in London... a long drive at 60 back down the M4 and it was right as rain again ! Poppy - TDCI (Puma) 110XS 2.2 - Camper conversion - see the build here - https://www.defender2.net/forum/topic56530.html
Elgar -TDCI(Puma) 110XS Dormobile - now sold Devon & Cornwall 4x4 Response - DC126 |
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26th Jan 2018 11:29am |
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| LCJ Member Since: 07 Sep 2009 Location: UK Posts: 201 |
Just to update this, it’s been to the dealer who said no fault codes showed and every defender he has seen does it. Plenty of warranty time left so will keep an eye on it!
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7th Mar 2018 7:51pm |
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| LCJ Member Since: 07 Sep 2009 Location: UK Posts: 201 |
As a further update, the car started choking when throttle was applied on Friday, and eventually cut out and wouldn’t restart. Dealer has proudly said they’ve identified it as the fuel pump, I’m just waiting for a more detailed explanation to see if it was VCV as I suggested when they first had it for two weeks..
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20th Mar 2018 8:55am |
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