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Benji

Member Since: 07 Mar 2016
Location: Cumbria
Posts: 4

Puma engine cuts out when idling or low revs when cold

Evenin all, i'm looking for ideas to resolve an issue with my 2007 defender 90 that is worst when the engine is cold - it cuts out when idling or low revs (e.g. when changing down a gear or braking quickly and slipping clutch). It takes about 10 mins for the engine to warm up, then the problem stops and runs smoothly. Definitely worse on frosty mornings, when its almost impossible to manouver out of my drive as I have to keep the engine above 1500 revs or it dies.

mechanic has replaced EGR valve and temperature sensor to no avail and nothing showing up on diagnostics.

Typically, the problem never shows at the garage as its a 10 min drive away!

Thanks

7th Mar 2016 11:34pm

Christian1402

Member Since: 17 Feb 2016
Location: Cumbria
Posts: 214

2009 Defender 110 Puma 2.4 XS CSW Indus Silver

I've got a similar problem. Does yours hesitate on acceleration sometimes too? If when going from first to second, there's no power for about 2 or 3 seconds, then it pulls like normal?

Mine also hunts at idle

9th Mar 2016 6:17pm

Benji

Member Since: 07 Mar 2016
Location: Cumbria
Posts: 4

It's fine accelerating, but cuts out when the revs drop and has just started to hunt when cruising when the engine is cold. Currently a frustrating mystery! Getting worse by the day - need some warmer weather!

10th Mar 2016 12:49am

Eduardo

Member Since: 28 Aug 2008
Location: Región Metropolitana
Posts: 2109

2007 Defender 110 Puma 2.4 SW Stornoway Grey

Guys,

I had a similar issue some time ago: RPMs in idle come down and up and finally the engine cuts. Also with the time the acceleration was also involved.

In our case turn to be the MAF doing erroneus lectures. After change the MAF the problen dissapears 100%

Cheers and good luck Eduardo

MY 2007 110 SW PUMA 2.4: Big Fog of 64'
MY 1994 Jayco 1207 Folding camper: "El Tremendo"

Click image to enlarge

10th Mar 2016 1:04am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17207

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

There are several - even many - things that could be contributing to this sort of running on a Puma.

The first thing I would do is check whether there are any DTCs stored on the ECU, since if there are it may save a lot of wasted time. In fact, the absence of any stored DTCs may also save wasted time, since if there is none it suggests that the problem is in an area not monitored by the ECU.

Possible causes that spring to mind are the EGR valve, MAF, MAP, or CHT sensors, or a fault with the fuel system. Hunting at idle especially when cold can be caused by a defective VCV or uncalibrated fuel pump.

10th Mar 2016 10:07am

Christian1402

Member Since: 17 Feb 2016
Location: Cumbria
Posts: 214

Thanks for the info. Am I right in thinking the tdci runs off nanocom, same soft wear as the td5?

10th Mar 2016 10:20am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17207

Nanocom can be used on the TDCi, but requires different software due to the engine ECU and instrument pack being CANbus based.

10th Mar 2016 11:26am

Christian1402

Member Since: 17 Feb 2016
Location: Cumbria
Posts: 214

I see, I'll have to see if there is anyone local with the equipment/soft wear

Thanks, and sorry for hijacking the thread!

10th Mar 2016 11:27pm

Benji

Member Since: 07 Mar 2016
Location: Cumbria
Posts: 4

Thanks all, v useful - and I spoke too soon - started to hunt on acceleration yesterday! Lots to try...

11th Mar 2016 8:30am

Christian1402

Member Since: 17 Feb 2016
Location: Cumbria
Posts: 214

If you find a solution to the problem please share, of course ill do the same if/when I find out what's wrong with it!

11th Mar 2016 9:28am

jst

Member Since: 14 Jan 2008
Location: Taunton
Posts: 7877

2011 Defender 110 Puma 2.4 USW Stornoway Grey

Likewise, i am interested to see how you get on Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop

11th Mar 2016 10:31am

Benji

Member Since: 07 Mar 2016
Location: Cumbria
Posts: 4

Warm weather today for first time in a while and it ran perfectly, so definitely cold related.

13th Mar 2016 11:32pm

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