 | Home > Puma (Tdci) > Loss of accelerator pedal response 2.4 Puma |
 
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| Cheshire110 Member Since: 26 Jul 2013 Location: Cheshire/London Posts: 2747  
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Maybe completely barking up the wrong tree but just maybe worth checking the fuel filter?
In the past my 110 and dads toyota land cruiser have both had odd issues relating to hills, throttle response and loss of power after picking up a bad batch of diesel and blocking out fuel filters. The same could presumably happen over time if not changed. An outside chance but maybe worth excluding anyway. And probably worth keeping filter changed every 1-2 years anyway if you haven't. Cheers, David Land Rovers of all shapes S3 onwards… Daily is a 110 V8. |
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6th Jan 2015 12:18am |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31  
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Thanks David
I have recently changed out the fuel filter, so pretty sure it's not that. Different sort of response to most fuel filter blockages I've experienced, but worth the suggestion anyway. Cheers |
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6th Jan 2015 2:20am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17319 
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It is just conceivable that the Volume Control Valve on the fuel pump is sticking and causing fueling issues. Generally when this happens there won't be any fault codes generated, and the diagnosis is really that there aren't any other obvious faults. There's also no way to test it without simply replacing it and seeing if it makes a difference. It is particularly common if you have had any fuel contamination at any time.
Over the years I have had a number of wierd misfiring/loss of power/uneven running issues from VCVs, they are also famous for needing replacement on Transits. Generally the symptoms are similar to those you may get from a malfunctioning EGR valve except without any DTCs beiong generated. |
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6th Jan 2015 8:57am |
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| Eduardo Member Since: 28 Aug 2008 Location: Región Metropolitana Posts: 2109  
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Mogboy,
Maybe is the same issue that happens to you There are several experiences in this forum with the problem of "loss of power" and you will find several threads with information. In short: Main problem is the cooling system of the Defender that is quite adjusted and sometimes cannot cope with hot climates. When the coolant temperature rise over certain point triggers the engine protection reducing the revs to protect it despite you are trying to acelerate it. In general there is a coincidence between a gear change and the appearance of the problem. The Temp gauge in general not shown the temp rising. Also No MIL ligth on. After several seconds the temps goes down and the engine works again without any trouble. I hope that can help Cheers from Chile Eduardo MY 2007 110 SW PUMA 2.4: Big Fog of 64' MY 1994 Jayco 1207 Folding camper: "El Tremendo"  Click image to enlarge |
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6th Jan 2015 1:11pm |
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| Lorryman100 Member Since: 01 Oct 2010 Location: Here Posts: 2686 |
Remove the plug from the TPS (Throttle Position Sensor) and coat the connections in electrical contact cleaner and plug back in. If you have a nanocom check the D and E values on the TPS at 2000 rpm and post the recorded values on here.
Click image to enlarge From the description of the fault and your actions to overcome, the TPS is the first thing I would look at. :thumbsup: Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated  |
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6th Jan 2015 2:31pm |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31
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Thanks lorryman.
Just have a scan gauge...not manikin, but will get s check readings when I get a chance to drop in. In the mean time I'll remove accelerator to clean contracts more thoroughly than I have by just wriggling connector to get a better contact. Cheers for everyones help. Mogboy |
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8th Jan 2015 5:40am |
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| earthscapes Member Since: 18 Aug 2014 Location: Guildford Posts: 5
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Hi.
Would like to know if you sorted this problem. I am just having the same issues? |
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5th Jul 2015 6:51pm |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31
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Just by cleaning the contacts, I have had long periods without issues (several months), leading me to think it was the pedal assembly. I replaced it a couple of weeks ago and am currently evaluating things. I'm not sure if it has been the answer, as I felt a couple of dull responses going up hill after about 25 minutes running.
I'll keep monitoring it, and if it hasn't fixed it, the next suspect is probably the VCV I guess. |
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6th Jul 2015 2:51am |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31
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The intermittent problem remains after replacing the accelerator pedal assembly. The engine goes really well with excellent power, but when it plays up, it's only when its warmed up and at lower revs and throttle settings. Today it experimented at 2 opportunities by depressing the clutch while keeping the throttle steady when playing up. On both occasions the revs picked up as per normal.
I was going to investigate the VCV next, but this now makes me wonder if there might be a sensor for the turbo playing up. I have confirmed that the wires to the turbo are intact before, and it's quite obvious that the turbo itself is fine. Also plenty of fuel available to make good power most of the time. Anyone got suggestions? Cheers Mogboy |
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13th Jul 2015 12:58am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295  
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not wanting to send you 'off course' but perhaps a little food for thought and welcome for others dismiss this but a couple of things that may be worthy of consideration;
hi/lo selector has impact on accel pedal response - could this be the route of your problems? also clutch switch does things to the engine controls - is your clutch pedal motion ok - could something be sticking / not working correctly? Also this links into the wiring at the rear ie brake lights? does the engine continue to sound right? when mines is running fine the intake has a lovely buzzing sound - when it's not it sounds more like a clatter - to me it's as if the turbo not up to speed and hence the clatter and lack of response? whatever - good luck and please keep us all posted? one last thing....are you happy the clutch is fully disengaging / working fine? |
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13th Jul 2015 8:15am |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31
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Hi Caterham
Thanks for those thoughts. The clutch is engaging & disengaging normally, and I have cleaned the electrical connections to the clutch master cylinder as a matter of course. I don't get any clatter from the engine. It sounds nice & quiet really. |
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13th Jul 2015 10:22pm |
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| Gonarezhou Member Since: 08 Mar 2015 Location: White River Posts: 178  
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Sounds like a "psycho" ECU to me. It will be interesting to see what it finally resolves the problem.
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14th Jul 2015 5:23am |
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| Mogboy Member Since: 21 May 2013 Location: Brisbane Posts: 31
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Had certainly crossed my mind too, Gonarezhou
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14th Jul 2015 5:29am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6295
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another wild though here......
as has been well documented on here a high temp can put the engine in to a reduced power mode. I've wondered but never followed it up. is it purely the water temp that will cause this? the reason I ask is the wire to the (I presume) oil temp sensor seems knackered / stiff on mine and it lead me to wonder what it actually does - presumably something, could it also have an impact similar to the water temp? If not then what's it for? (I'm referring to the sensor which from memory is somewhere near the oil filter) |
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14th Jul 2015 6:24am |
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