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| 22900013A Member Since: 23 Dec 2010 Location: Oxfordshire Posts: 3139   
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When I try to cruise at 30mph my speedo needle bounces between 30 up to 40, and the engine sounds as though it is surging slightly, although the rpm needle stays solid. Does this whatever gear I'm in. I know my speedo drive was replaced due to it having a tacho fitted, but it has never done this so badly before. It usually does it after I have a decent run on a motorway then come onto a B road or whatever. The needle goes back to normal as soon as I accelerate up to 40, 50 or whatever.
Any ideas? 2011 110 USW 1973 Series III 1-Ton 1972 Series III 1-Ton Cherrypicker 1969 IIA 1-Ton 1966 IIA 88" |
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1st May 2018 3:08pm |
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| rallysteve Member Since: 10 Feb 2014 Location: Cumbria Posts: 2196 
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I presume this is your 2011 puma engined vehicle?
If so there shouldnt be any bounce with it being electrical. I would suggest a few simple checks if your noticing the sound of the engine surging as well. I would first advise checking your propshaft UJs are in good condition and that the UJ yokes are correctly lined up with each other at both ends of each shaft. Steve 02' 110 TD5 Double Cab Rebuild Thread 84' 90 3.9 V8 Caged Pickup Build Thread - Now For Sale Mobile Diesel Heater Build Thread Last edited by rallysteve on 1st May 2018 4:14pm. Edited 1 time in total |
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1st May 2018 4:14pm |
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| windy81 Member Since: 14 Mar 2018 Location: North Wales Posts: 311  
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With my 200tdi old school speedo it does the same. I'm convinced that it's got a kink in the cable somewhere.
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1st May 2018 4:14pm |
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| 22900013A Member Since: 23 Dec 2010 Location: Oxfordshire Posts: 3139
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Yes it is my 2011 Puma. There is definitely a bounce, if it is electrically driven then obviously the impulses are somehow out of kilter. The surging is very subtle and only happens when the speedo is bouncing, the vehicle does not move any faster and the rev counter remains solid, but it is as though power is coming on and off very slightly. 2011 110 USW
1973 Series III 1-Ton 1972 Series III 1-Ton Cherrypicker 1969 IIA 1-Ton 1966 IIA 88" |
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1st May 2018 8:31pm |
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| 22900013A Member Since: 23 Dec 2010 Location: Oxfordshire Posts: 3139
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I believe it os off the gearbox but electronic or at least electro-mechanical. The pick up was replaced as part of the tacho installation, I still have the original one somewhere. 2011 110 USW
1973 Series III 1-Ton 1972 Series III 1-Ton Cherrypicker 1969 IIA 1-Ton 1966 IIA 88" |
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3rd May 2018 7:06am |
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| marcoegyptos Member Since: 16 May 2009 Location: Vetraz-Monthoux Posts: 29 
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Hi
I have almost the same problem , I didn't solve until now as I am out of home from several months. I change already the speed sensor ., no result . When I start the car , I don't have any problem with intermittent inductive load (AC & wiper) but when the battery is fully loaded the problem appear , that means when I have inductive load open , those create a surge it's look like a load dump , . Should it be a bad ground ? may be in the C0550 connector . I should investigate deeply as in this condition the car is not drivable. Any idea is welcome ? |
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3rd May 2018 9:32pm |
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| 22900013A Member Since: 23 Dec 2010 Location: Oxfordshire Posts: 3139
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That ^^^ sounds horribly complicated.
I did notice on mine that there is no problem until the engine is thoroughly warmed up. I can't help think something is getting hot somewhere. 2011 110 USW 1973 Series III 1-Ton 1972 Series III 1-Ton Cherrypicker 1969 IIA 1-Ton 1966 IIA 88" |
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5th May 2018 8:39am |
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| derbywill Member Since: 25 Mar 2010 Location: Derbyshire Posts: 539  
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Have a look where your original sensor would be and there might be a short cable that goes to a tachograph kitas sender. The cables are prone for plying up and eventually snapping.
Cheers will 2005 90 XS 1954 86'' Series 1 tilt |
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5th May 2018 5:32pm |
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| 22900013A Member Since: 23 Dec 2010 Location: Oxfordshire Posts: 3139
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Where do I need to be looking? And why does it only happen at certain speeds and once everything is warmed up?
I did some testing today. After first setting off everything is fine. 25 miles up the motorway, turn off and the needle is up and down like a yo-yo, reading 40-50 when doing 30. Definite "on-off" feel of power through the engine, but rev counter remains static. Coming home, I found if I cruise at 20mph there is a very slight wobble from the needle, cruise at 40 and it is fine. 2011 110 USW 1973 Series III 1-Ton 1972 Series III 1-Ton Cherrypicker 1969 IIA 1-Ton 1966 IIA 88" |
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5th May 2018 9:30pm |
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| jackbuchan4x4 Member Since: 19 Sep 2019 Location: Glasgow Posts: 1 
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Good Morning,
I have the same issue on one of our 2016 Defender PUMA 2.2 Litre Do you have any update did you manage to get to the bottom of this issue? Hope to hear from you soon! Jack Buchan 4x4 Hire (Scotland) Ltd jack@4x4hirescotland.com Tel: 07711-329631 |
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19th Sep 2019 11:30am |
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