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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6304
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
?

I still can't get my head round why the hunting would only occur when hot if it were the vcv?
Post #558067 22nd Aug 2016 6:14pm
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tobz102



Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134
United Kingdom 2008 Defender 90 Puma 2.4 HT Stornoway Grey
I've just done about 40 minute drive and think I'm noticing that it only occurs when the clutch is up and in neutral. Seems to happen only when been driven (warm). Only recently I removed and cleaned my clutch switch to cure a rev surge between gear change issue I was having. IIRC this rev hunting has only happened since that, so perhaps the two are linked. I'll test more this week to be certain that it's indicative of neutral being engaged and clutch being up, but yet another possible area for thought.

For me I'm too struggling to understand how a fueling issue would be apparent only under the above conditions. That's why my first guess was perhaps EGR as a hot valve may be more likely to stick than a cold one - theoretically. Besides, aside from this slight issue there's no other suggestion that there's fuel issue. Going to explore the cheaper, less complicated options first
Post #558080 22nd Aug 2016 6:42pm
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blackwolf



Member Since: 03 Nov 2009
Location: South West England
Posts: 17458
United Kingdom 2007 Defender 110 Puma 2.4 DCPU Stornoway Grey
Caterham wrote:
?

I still can't get my head round why the hunting would only occur when hot if it were the vcv?


Why can't you "get your head round it"? Many things behave differently when hot.
Post #558146 22nd Aug 2016 9:42pm
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Lorryman100



Member Since: 01 Oct 2010
Location: Here
Posts: 2686
Leviathan wrote:
Does the VCV need any software setup Lorryman? Also is it easily changed?


Yes unfortunately, the fuel pump and EMS go through a learn cycle which needs to be programmed with a suitable diagnostic tool. If you are going to keep the Puma it is well worth the expense of getting a dedicated diagnostic tool for your Puma. These range in price form about £350 to £10k. I did a write up on some of the tools I own but personally I carry the IID BT tool from Gap diagnostics in my cubby box as my every day go to tool.

http://www.defender2.net/forum/topic10829.html

http://www.defender2.net/forum/topic38873.html
Post #558309 23rd Aug 2016 2:03pm
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Lorryman100



Member Since: 01 Oct 2010
Location: Here
Posts: 2686
Caterham wrote:
?

I still can't get my head round why the hunting would only occur when hot if it were the vcv?


Wayne the tolerances of metal parts change with temperature and as you know metal expands with heat as do the tolerances of different metals as does the viscosity of the fuel.
Post #558310 23rd Aug 2016 2:07pm
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Caterham



Member Since: 06 Nov 2008
Location: Birmingham
Posts: 6304
England 2011 Defender 110 Puma 2.4 XS CSW Stornoway Grey
Thumbs Up
Aha. That makes some sense.
It's all easy stuff when explained. Thank you.
Post #558354 23rd Aug 2016 5:28pm
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Leviathan



Member Since: 24 Oct 2015
Location: Staffs
Posts: 248
United Kingdom 
Lorryman100 wrote:
Leviathan wrote:
Does the VCV need any software setup Lorryman? Also is it easily changed?


Yes unfortunately, the fuel pump and EMS go through a learn cycle which needs to be programmed with a suitable diagnostic tool. If you are going to keep the Puma it is well worth the expense of getting a dedicated diagnostic tool for your Puma. These range in price form about £350 to £10k. I did a write up on some of the tools I own but personally I carry the IID BT tool from Gap diagnostics in my cubby box as my every day go to tool.

http://www.defender2.net/forum/topic10829.html

http://www.defender2.net/forum/topic38873.html

Would the Nanocom work for me if I jumped on the group buy Lorryman?
Post #558387 23rd Aug 2016 7:22pm
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Lorryman100



Member Since: 01 Oct 2010
Location: Here
Posts: 2686
No I don't think it does as that would put it in direct competition with their premium tool the MSV2.
Post #558403 23rd Aug 2016 8:06pm
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Leviathan



Member Since: 24 Oct 2015
Location: Staffs
Posts: 248
United Kingdom 
Do you know if the Foxwell NT510 http://www.scantool-direct.co.uk/foxwell-n...rsion.html
mentioned earlier would do the job?
Post #558448 23rd Aug 2016 9:41pm
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Cupboard



Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971
United Kingdom 2011 Defender 110 Puma 2.4 HT Corris Grey
It says it will.



Post #558497 24th Aug 2016 6:35am
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tobz102



Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134
United Kingdom 2008 Defender 90 Puma 2.4 HT Stornoway Grey
my problem is fixed now
Post #559658 29th Aug 2016 6:28am
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Cupboard



Member Since: 21 Mar 2014
Location: Suffolk
Posts: 2971
United Kingdom 2011 Defender 110 Puma 2.4 HT Corris Grey
Good.
How?
Post #559669 29th Aug 2016 7:13am
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tobz102



Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134
United Kingdom 2008 Defender 90 Puma 2.4 HT Stornoway Grey
Replaced the horrifically gunked up clutch switch and it idles beautifully now. My idle issue was only @ tickover in neutral.
Post #559674 29th Aug 2016 7:39am
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Leviathan



Member Since: 24 Oct 2015
Location: Staffs
Posts: 248
United Kingdom 
Bow down Intrigued. Bow down

What was it gunked up with?
Where is it?
Is it easily changed?
How much?
Post #559709 29th Aug 2016 9:54am
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tobz102



Member Since: 07 Feb 2014
Location: Atherstone
Posts: 134
United Kingdom 2008 Defender 90 Puma 2.4 HT Stornoway Grey
Couldn't tell you what the gunk is but it looked like this:


Click image to enlarge

Replaced it with one I got from eBay for like £25. I had the problem of it holding revs on gear change and a few weeks ago I unplugged and replugged and it solved that problem, but created the hunting idle issue. Fitted the new one and it's gone away.

It's an hour job max, plugged into the master cyclinder - you can't miss it. It's a bit awkward to get out, I used a crowsfoot 15mm maybe? I don't actually recommend removing the housing also (the part on the right hand side of the pic) but it came with it as they were seized together. I'd hold that in place with a 16mm spanner as you undo the switch, as it took me a while to make it leak proof again. The system needs bleeding afterwards too.
Post #559735 29th Aug 2016 1:26pm
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