 | Home > Puma (Tdci) > Diesel mystery knock on the highway |
 
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5695  
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Mine also does this, so interested in any replies.
Andy |
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27th Jul 2015 7:25am |
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| Schw8te Member Since: 03 Jun 2012 Location: NRW Posts: 27  
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Sure it's the eingine and not the gearbox?
On pumas, a 2" lift (more or less) causes this rattling in the gearbox due to the steeper angle in the drivetrain. Det locker bleiben |
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27th Jul 2015 7:52am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120 
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Hi Andy, sorry to hear this.
Is there a certain speed and/or motor load associated with the knocking in your TDCI? For me, it usually starts at 2000 rpm and 100 km/h (62 mph). When driving up a hill, it occurs earlier. I hope it's not one of the cylinders - 
PS: Reading the comment on the gearbox - interesting, since it occurs more readily when driving up on an incline (but not only). How could one spot a faulty gearbox? And could it be triggered by a certain position of the accelerator? |
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27th Jul 2015 8:16am |
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| RED-DOT Member Since: 29 Jun 2009 Location: stirling Posts: 2363 
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A heat shield cracked? 2008 RS4 gone, 123d M Sport, and a Puma 90 XS..
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27th Jul 2015 9:08am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Have checked that... I am now afraid it could be an injector, since I found many parallels to this thread: http://www.defender2.net/forum/topic1873.h...p;start=15
Andy, have you seen this? |
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27th Jul 2015 9:19am |
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| landy andy Member Since: 15 Feb 2009 Location: Ware, Herts Posts: 5695
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Mine is pretty much exactly as you say. On a daily basis I don't notice it at all but on long runs at very light throttle, at about 2000rpm I get the diesel knock. Was very very apparent on the 3000 miles I've just done on holiday. Once engine is warm, and noise has occurred, I can get the noise to reappear at will. I also know it is engine based as I've fiddled with most other items. On last years holiday it was much much much worse and became a massive knocking eventually, that was on,y resolved by fitting a new VCV and getting it recalibrated, then map replaced. I'm almost at a point of believing it's a very nasty horrible ford transit engine, and I'm being over sensitive.
Andy |
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27th Jul 2015 4:27pm |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Yeah, I'm unsure whether I am too sensitive or not, as well. Still, if I compare it to other Defenders, it does not sound very healthy.
Since my first post I've heard from people with knocks occuring at the same parameters (warm motor, slight throttle, rpms around 2000) ending up with a totaled engine. Reasons were very varied (if they did investigate, which many with a dead engine do not to avoid further costs), which makes the diagnosis hard. First check will be cleaning the injectors with Liqui Moly 5128. If it helps, I'll know a little more. VCV was also on my list. Then, there's the next inspection coming up at a very experienced workshop. I will report if I find out a remedy - or if it's just my paranoid mind. So the best wishes for us knock-afflicted folks - |
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28th Jul 2015 10:28am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298  
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dead engine.....are we talking 2.4's or 2.2's here (or both) ?
good luck with resolving. |
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28th Jul 2015 10:36am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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Those I heard about were 2.4 litre engines. I know, the 2.2 have their own worries with the oil pump...
Mine is a 2.4, too, MY 2007. 110k miles. Caterham, in the thread I linked, you reported the same problem with the Defender you sold. Injector changes remedied this, as you wrote. Can you elaborate on this? |
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28th Jul 2015 10:46am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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I can't fully recall other than to say the trader who bought it off me took it to TJ Fews and had amongst other things new injectors - seem to recall there was silicone on one of the electrical connectors, and possibly the fuel pump but can't say for sure? - sorry.
I think the 2.4 knocking you are referring to is on start up - something to do with blocked oil ways causing oil starvation to the bottom end and hence ultimately engine failure? I don't think it has anything to do with what you're experiencing? |
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28th Jul 2015 11:26am |
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| spudfan Member Since: 10 Sep 2007 Location: Co Donegal Posts: 4655 
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Our 2008 had the knock on start up. It was the Pressure Control Valves not kicking in until the engine had warmed up. This led to excessive engine wear. Had an engine change after six years of ownership with LR picking up the lion's share of the bill. Seems there's an instruction issued to dealers that if a customer reports these symptoms an engine change is in order. I just assumed it was diesel knock and never reported it. It was only when I started getting high oil consumption and increased smoke readings that I knew I had a problem. If I'd reported it within the three year warranty I'd have had got it done free gratis. Still I was treated very well. There are full details given on site here about my troubles and ultimateley getting it sorted.
I can't find the bulletin issued to dealers about this but someone else might. 1982 88" 2.25 diesel 1992 110 200tdi csw -Zikali 2008 110 2.4 tdci csw-Zulu 2011 110 2.4 tdci csw-Masai |
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30th Jul 2015 11:57pm |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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spudfan - just to reiterate. this was only on start up?
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31st Jul 2015 6:04am |
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| enfield_dinosaur Member Since: 14 Jun 2015 Location: Tertius orbis Posts: 120
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spud - wow, still sounds like a lot of grief!
Mine differs in that it's only knocking when warm and upwards of 2.000 rpm/60 mph on the highway. Strangest thing to me is that the knock only occurs when partially accelerating or stepping off the gas. I suspect that under these circumstances either the airflow or the diesel injection are not quite right. The reasons for it are a mystery, though. If I want to avoid the knock, I have to either drive like a madman or granny-style. Or accelerate in waves, all not quite practical... |
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31st Jul 2015 7:10am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6298
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e_d,
are you saying the diesel knock is there when off the gas? If I'm not mistaken when in gear at speed and you take your foot off the gas I believe it actually stops fuelling - therefore it can't be diesel knock? Last edited by Caterham on 31st Jul 2015 11:56am. Edited 1 time in total |
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31st Jul 2015 7:18am |
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