 | Home > Puma (Tdci) > Holding its revs |
 
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& did seem to lack power at times. I did have a trailer on the hook but it normaly does better than this
| bobcat Member Since: 11 Feb 2012 Location: United Kingdom Posts: 12  
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I know it sounds silly but have you checked the brake light fuse? This will cause rev holding in gear change and as you've had a trailer connected is worth a look.
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23rd Oct 2013 9:49pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7712 
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so having a trailer connected changes the engines characteristics? any more details? Cheers
James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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23rd Oct 2013 10:00pm |
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| bobcat Member Since: 11 Feb 2012 Location: United Kingdom Posts: 12
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No. Having a trailer on is a possible cause of a blown brake light fuse.... which in turn does... Obviously you are skeptical but it's true.
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23rd Oct 2013 10:06pm |
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| william8 Member Since: 03 Apr 2013 Location: Motherwell Posts: 259  
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Pull the sensor lead off of the clutch sensor in the engine bay, if your rev holding is gone thats your problem.
Pull both your MAF and MAP sensors and clean with brake cleaner etc. ; replace and see how you get on. William |
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23rd Oct 2013 10:22pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 19661
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Bear in mind EGR has quite a difference on fuel economy and performance combined. What are your fault codes?
EGR could be putting out the MAF which in turn will also log faults and illuminate MIL. Diesel$ Live$ Matter. ⛽️🛢️👨🔧🧰⚙️ RED, WHITE & BOOST! 🇬🇧 |
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23rd Oct 2013 10:51pm |
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| Dieselhead Member Since: 21 Oct 2012 Location: Pulborough. West Sussex Posts: 552 |
Thanks for the info
Brake lights are working unless theres a fuse just for trailer socket? I will check Will pull the sensor plug off the clutch & see I do have a new EGR valve which I was planning to put on when I get 10 mins 
Will make a note of the codes & report back later
Never had the MIL light come on Thanks! Chris 2008 XS 110 2.4 Utility. Tonga Green 1953 Series 1 for restoration 1983 Mini Mayfair 2004 VW T5 Camper 2008 Diahatsu Sirion. Thats hers Classic Bolens Garden Tractors |
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24th Oct 2013 6:42am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7712
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no, just not heard about it and was interested to hear more.
so a blown brake light fuse makes the vehicle hold the revs for longer then is what you are saying? Does anyone know why? Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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24th Oct 2013 9:03am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16943 
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There is an input from the brake switch into the ECM which affects the engine perfomance. If, for example, you press the brake pedal with your left foot after driving through water to dry the brakes, after a short time the ECM cuts all power to the engine (as I found out in the floods a few yeara ago - see thread somewhere else on this forum).
I am not sure exactly why brake light circuit fuse failure has unexpected effects on the ECM, but it is established that it does and it has been disussed on this forum before. All part of the strange joy of owning a Defender! |
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24th Oct 2013 9:47am |
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| Norm4n Member Since: 31 Aug 2012 Location: Surrey Posts: 329
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I had this issue recently, together with the loss of anti-stall (increase in engine revs when in low range).
For some reason the rev holding between gear change dissapeared after a week, but anti-stall still isnt working. I have no bulbs out, or blown fuses. Just changed my clutch switch, that didn't cure it. Next on the shopping list is the high low switch on the transfer box. Have you had any ABS lights staying on whilst driving?? |
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24th Oct 2013 11:20am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16943
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Sorry to nit-pick, but that's actually the idle jack, not the anti-stall. I assume that you've checked the high/low detection switch is working? |
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24th Oct 2013 11:33am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7712
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cheers, so like the later MY RRS family, cuts engine revs when you press the brake pedal, thats from a DSC point of view. Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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24th Oct 2013 2:59pm |
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| Dieselhead Member Since: 21 Oct 2012 Location: Pulborough. West Sussex Posts: 552 |
Sorted it
It was the brake light fuse blown 
But the brake lights were still working, I had it parked up against the gates so could see in the dark 
I think its my truck lights on my trailer which over powered it. Have to take a couple of bulbs out! Thanks for all the help So you all will be checking your fuses this weekend Chris
2008 XS 110 2.4 Utility. Tonga Green 1953 Series 1 for restoration 1983 Mini Mayfair 2004 VW T5 Camper 2008 Diahatsu Sirion. Thats hers Classic Bolens Garden Tractors |
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24th Oct 2013 7:32pm |
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| bobcat Member Since: 11 Feb 2012 Location: United Kingdom Posts: 12
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Glad you got it sorted. The fuse thing really surprised me when mine did it (also with a trailer). As there seem to be lots of people who understand the system better than me and it appears to be linked with the clutch switch, does anybody know how to disable the idle jack in low. The increased engine speed makes it too fast for unloading a trailer whilst moving along when setting out fence posts etc.
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24th Oct 2013 7:56pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16943
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Disconnect the high/low switch.
Be very careful if descending steep loose slopes in low 1st with idle jack disabled, since the gearing is so low there's a real risk of loss of adhesion (which is the reason for the IJ in the first place). |
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24th Oct 2013 10:22pm |
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