 | Home > Puma (Tdci) > 2.4 TDCI idle speeds - SOLVED |
 
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6342   
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could it be to do with the clutch sensor?
I believe if you discount the sensor you get a change in revs but I can't recall the exact scenario. easy enough to disconnect and see what happens. if there's no change I would suspect that sensor is not working as it should. 
good luck |
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30th May 2025 4:27pm |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 17794  
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Speed input is from the speedo transducer.
You may want to do a forum search on "idle jack". |
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30th May 2025 4:33pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3564  
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Its called idle jack.
Its possible that your high/low range selector switch is stuck thinking its in low range. I do not recall from memory if it closes the circuit on high or on low range, but a quick check is to check with multimeter on reaistance setting and check in the switch that it is working. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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30th May 2025 4:33pm |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65  
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Great advice chaps
I’ll get out there tomorrow and try both the low range switch and the clutch switch Searching for idle jack right now 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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30th May 2025 4:42pm |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Couldn’t wait till the morning - it’s bothering me
So unplugged the clutch sensor (looks new) and it holds the revs high between gears - that would snuggest its working? The high/low - well I get the diff lock light as expected, but with it in low range - the revs come up to 1000 as I pick up speed (in first and second at least) Back into high range - behaves as before Question is ….. what exactly does the low range switch do? Does it say ‘I am in low range’? Or does it say ‘I am NOT in high range’? I’ll get under car tomorrow and try to test what it’s doing - can also swap bits from my other 110. As a side note I get p0234 turbo overboost and the typical MAF in range but higher/lower than expected (new turbo, new MAF and MAP genuine Bosch). Could be the ECU doesn’t know whats going on! 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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30th May 2025 7:36pm |
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| custom90 Member Since: 21 Jan 2010 Location: South West, England. Posts: 20853
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The clutch switch requires a closed circuit if you disconnect it, unlike some previous models you cannot just unplug it or you’ll have the issues you’ve noticed.
The clutch switch works alongside the idle jack as mentioned also. In low range, the revs are a little higher if I remember rightly with the clutch switch working as it should, if the clutch switch is disconnected and a closed circuit then the revs will be slightly lower. The anti stall will still work in all states though, both high range and low. I ran a long time with the clutch switch bridged / closed, I prefer how it drives, I think there is a small improvement in MPG. The downside is, I believe the clutch switch momentarily cuts torque by approx 25% during gear changes, but is designed to I think reduce peak torque via transmission components. This protects a little from extreme shock loading, and extreme momentary torque on the clutch, and various other components. I’m 50/50 on that issue really, I used it like that as the clutch switch when it fails causes a Rev hang, aka an unwanted throttle input when put in gear. The clutch switch wasn’t working, so I bridged it, but at a later date I replaced the clutch master and switch with it, and as it is working as it should, I went back to the original factory set up. I’m not convinced however, that, the slight torque input changes due to the clutch switch is ideal for the drive members though, but neither would a very sudden very high torque input by an accidental gear change say on a surface where grip was suddenly found, in that case a lower torque input, even just a smaller percentage might well save a halfshaft from being broken. _\Hennessey|Venom| F5/___ ___\⭐️Lone|Star|State/___ ____\We|Will|Win/___ ____/🇬🇧🇺🇸\____ _//*⛽️🛢️⚙️🧰*\\_ |
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31st May 2025 10:26pm |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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So had a route around
Found this connector … not connected to anything also found twisted wires - think they are the same colour Any ideas? 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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1st Jun 2025 7:55am |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Photos 2010 90 LHD soft top
2010 110 XS 1985 90 soft top Last edited by Topvaruk on 1st Jun 2025 8:07am. Edited 1 time in total |
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1st Jun 2025 7:56am |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Try again
 Click image to enlarge Click image to enlarge Click image to enlarge 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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1st Jun 2025 7:56am |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Now I can zoom in …. I can see white with violet tracer on the ‘spare’ plug and white with black tracer on the twisted pair
This is interesting thou …. With the wires separated it behaves the way it should …. Ie the light lift in revs when moving Just need to find where they should be connected to and probably get hold of a new plug to fit 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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1st Jun 2025 7:58am |
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| jbcollier Member Since: 29 Apr 2024 Location: Edmonton AB Posts: 240  
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This is a useful site for those stray connectors:
https://www.lrworkshop.com/connectors/defender-2007/colour The black and white/black pair look to be for the transfer case hi/low range switch. |
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1st Jun 2025 3:34pm |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Many thanks for this
Very useful 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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2nd Jun 2025 2:10pm |
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| jim4244 Member Since: 13 Apr 2014 Location: Bedfordshire Posts: 947 
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Hi
It looks as if what you have discovered is the DIY fix for the engine surge that is supposed to help with gear changing? Read the last post of the below: https://www.defender2.net/forum/topic1343....p;start=15 Jim |
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2nd Jun 2025 3:02pm |
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| Topvaruk Member Since: 25 Apr 2018 Location: bratislava Posts: 65
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Thanks Jim
Very useful 2010 90 LHD soft top 2010 110 XS 1985 90 soft top |
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2nd Jun 2025 3:40pm |
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