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schuee

Member Since: 16 Jul 2012
Location: Lincolnshire
Posts: 378

2011 Defender 110 Puma 2.4 USW Orkney Grey

Erratic Idle

Evening All,
Whilst waiting at some lights today I heard a tapping rattling noise, at first I thought it was coming from the car in front of me, though with this the tick over became very erratic, so give it a little rev to see if it would change with this there then was a high pitch rattle noise for a few seconds, then it went away, although the engine note now sounds more noisy, rattly now it still drives fine
This has happened a few times today, I have contacted my dealer about it, just thought I would ask if anybody had any ideas,

Cheers
Keith

5th Mar 2014 10:51pm

Norm4n

Member Since: 31 Aug 2012
Location: Surrey
Posts: 329

Does it disappear when you press the clutch?

6th Mar 2014 7:41am

schuee

Member Since: 16 Jul 2012
Location: Lincolnshire
Posts: 378

I will give that a go today if it happens again, any reason behind that?

Cheers
Keith

6th Mar 2014 7:50am

Cheshire110

Member Since: 26 Jul 2013
Location: Cheshire/London
Posts: 2760

Mines had a few issues relating to idle ('hunting [reving up and down], noisy etc) and they were EGR related. As soon as it's out of warranty ill have it remapped and the EGR turned off. Cheers, David
Land Rovers of all shapes S3 onwards… Daily is a 110 V8.

6th Mar 2014 8:11am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17427

2007 Defender 110 Puma 2.4 DCPU Stornoway Grey

A malfunctioning Volume Control Valve in the fuel pump on the 2.4 TDCi can cause an erratic idle and injector rattle without throwing up any DTCs. Not easy to diagnose, except that most other things will cause DTCs so the absence of a DTC is in itself a clue.

6th Mar 2014 10:04am

schuee

Member Since: 16 Jul 2012
Location: Lincolnshire
Posts: 378

Hi David,

Well that is interesting I have just had the EGR valve replaced with a new unit about a month ago by my dealer, because the old one was squealing like a pig

Many Thanks

Keith

6th Mar 2014 10:07am

schuee

Member Since: 16 Jul 2012
Location: Lincolnshire
Posts: 378

blackwolf wrote:
A malfunctioning Volume Control Valve in the fuel pump on the 2.4 TDCi can cause an erratic idle and injector rattle without throwing up any DTCs. Not easy to diagnose, except that most other things will cause DTCs so the absence of a DTC is in itself a clue.

Hello Blackwolf,

Not getting the MIL light lit up, so am I correct in saying there will be no DTC events if dealer checks this out? If this is the case I may mention what you have related to me, as my warranty runs out in September and don't want to be left with any nasty surprises if not correctly diagnosed now.

Thanks for the info mate,

Keith

6th Mar 2014 10:18am

blackwolf

Member Since: 03 Nov 2009
Location: South West England
Posts: 17427

There are many situations which will cause DTCs without turning on the MIL, but the VCV is one of the few areas of the engine management system which isn't very effectively monitored. The result is that a VCV can be quite severely faulty and definitely cause driving faults and yet not cause any DTCs.

Transits also have issues in this area.

6th Mar 2014 7:12pm

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