Member Since: 14 Nov 2013
Location: Athens
Posts: 178
engine idle
Hi all,
I'm experiencing irregular idle,with the vehicle shaking a bit when the engine is cold regardless of gearbox being at P, N or D(even in hot weather). To be more precise, engine starts and works very smooth in the first few minutes from cold. As engine temp builds up , to say 40-50 celcius, idle starts to became rough with the revs fluctuating +_100ish. When engine warms up, idle quality is fine.
Forgot to mention that, when driving, or when revs are above idle , everything seems fine. The only fault stored when i used IID tool was B1C57 which i cannot clear.....
Any ideas
19th Nov 2013 3:29 pm
DN D3 Decade
Member Since: 24 Jun 2006
Location: W.London.
Posts: 2294
Mine used to do this quite noticeably too, (and so did another new D3 I asked to compare with at a dealership when mine was new) Last year when I did an oil and filter change, I replaced the oil temp sensor (screws in L/H side of sump). It is now much better,but not quite perfect Engine idles spot on after start up and when fully warm,there is just a short period whilst warming up where it hunts a little,and I only notice it if I happen to stop in traffic etc at that particular moment during warm up. HTH.
19th Nov 2013 6:38 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
You need to look at live date to see if the oil and coolant temps make sense.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Thanks guys, will plug the IIDtool and check live data.
Will let you know what i saw.
20th Nov 2013 11:35 am
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Robbie wrote:
You need to look at live date to see if the oil and coolant temps make sense.
Checked oil and coolant temps, seemed ok.
Now two faults relating to the engine came up, P140A and p140E(EGR faults i think) although my car is MY05 and EGRs have been blanked. And several U faults that have been cleared. Also some interior lamp fault, and passive ignition circuit B1c57 that doesnt clear.
26th Nov 2013 10:48 am
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Went to the dealer's today, plugged the car and found no faults apart from the EGR faults. They said injectors are fine and cannot understand why this happens
They recommended that i should have an engine software update, or something like that, but have to ask the previous owner's dealer first, because they need to find out what kind of chip upgrade the car has.
I had bought the car with the chip, and it worked fine then.
27th Nov 2013 5:05 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Problem still there. I was wondering, could idle fluctuation be autobox related? It does it though either in P N or D.
2nd Dec 2013 7:13 am
nighthawk
Member Since: 24 Jul 2010
Location: Malta
Posts: 1163
I had a noticeable case of this recently. 2 things I've done made things dramatically better, though it still fluctuates a tiny bit sometimes.
1. I finished my tank of diesel and filled up again (maybe a batch of crap diesel).
2. I replaced the MAF sensor (the thing attached to the air filter case) as it was giving me an random, occasional ESF in cold weather.
Not sure if any of them helped or if it was just a coincidence.
PS. Mine is a manual transmission with EGR's blanked.Dennis
2006 Discovery 3 TDV6 Commercial Manual Buckingham Blue
2nd Dec 2013 8:28 am
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Thanks nighthawk, no ESF on me, also it doesnt relate to warm or hot weather. Just when engine is cold, i.e hasnt worked for say 10 hours, even in greek summer. Its being doing this for 2-3 months now!!!!!
2nd Dec 2013 3:21 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Still investigating.......
Is there a chance that the irregular idle when engine is cold , is caused by the autobox torque converter???? The shaking and rough idle happens only when engine is cold and only at tickover, if you rev it its fine
4th Dec 2013 6:09 pm
tomtom86
Member Since: 09 Mar 2013
Location: Here and there
Posts: 590
Have they checked the injectors properly? As this is the usual cause of this fault aside from oil temp sensor
4th Dec 2013 6:51 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
No fault codes found on dealers equipment. Also dealer had a look from the outside and saw no leaks etc. He didn;t take them out though. He said they work fine......(and they do when engine is warm!!!).
4th Dec 2013 8:19 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Problem still there, not getting worse or better. Any electrics causing that maybe??????
26th Feb 2014 8:16 pm
stav
Member Since: 14 Nov 2013
Location: Athens
Posts: 178
Have just bought an IIDtool so i checked the readings in injectors. The readings are between 920 and 1100 . This is at idle speed, regardless if i have normal or 'shaky' idle. Idle issue is been there for almost 1 year now. Not getting any worse, just for a few mins each time. And .....not every day
22nd Sep 2014 12:14 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
It would be good to establish a cause but sometimes you need to be with a vehicle for it to give you clues.
This could be a straight mechanical problem or even something as simple as a damaged engine mount. There are a number of things that can cause a poor idle but I fear I would be guessing as there are too few clues to work with.Land Rover - Turning Drivers into Mechanics Since 1948
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Last year when I did an oil and filter change, I replaced the oil temp sensor (screws in L/H side of sump). It is now much better,but not quite perfect 
Engine idles spot on after start up and when fully warm,there is just a short period whilst warming up where it hunts a little,and I only notice it if I happen to stop in traffic etc at that particular moment during warm up. HTH. 
