Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Diagnosing 'effort smoke' and hunting idle when cold
Hello all,
'05 D3 TDV6 manual - 113k miles.
When cold, my idle will hunt very slightly - clears when engine is warm(ing). I also have what I'd call 'effort smoke' - that is she'll give a haze of smoke when it giving it some welly. In all other circumstances, the engine doesn't smoke at all, no cold/hot start problems either.
Plugging in diagnostics (iCarsoft I930) gives following injector values:
Do I correctly interpret a problematic no.3 injector - which appears to have consistenly high balance against the other 5 in each of the monitored engine temps?
EDITED: fix up typos
Last edited by kayble on 11th Apr 2017 8:55 am. Edited 2 times in total
9th Apr 2017 10:39 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Mines just started doing the exact same thing and I also have one injector at 1.3 even had a fault code saying its out of range, I actually have a new injector but cant be arsed to do it!
Mine also doesnt smoke most of the time but power on and there is some initial haze, dont forget its still dark at night so any smoke is much more visible, the initial haze has been there for the two years I have owned the car.
Apparently oil temp sensor in the sump can also cause lumpy idle.
Important to note injector numbers dont all coincide with cylinder numbers.
10th Apr 2017 6:39 am
kayble
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
I had read this as well.
On mine coolant and engine oil temp correspond. Taken this morning:
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Other thing to note is that the MAF sensor appears to be reading correctly with an idle value of 17g/s observed - value rises/falls with engine speed.
Oddly, you need to read the car as an RRS TDV6 to get a reading from the MAF. If you select the presumably correct Discovery 3 TDV6 option, I get a constant value of 4g/s from the MAF regardless of engine speed - odd
11th Apr 2017 8:55 am
tcr4x4
Member Since: 24 Jan 2010
Location: England
Posts: 1526
I have the same symptoms too.
Runs very lumpy when cold (cold engine not cold weather) sometimes, the Rev gauge wavers slightly on idle and sometimes you can feel entire car shakes.
I occasionally get a fault on injector 6 out of range so I guess that's the issue, a faulty injector.
Doesn't always happen though which is odd.
11th Apr 2017 9:48 am
kayble
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
lynalldiscovery wrote:
Mines just started doing the exact same thing and I also have one injector at 1.3 even had a fault code saying its out of range, I actually have a new injector but cant be arsed to do it!
Mine also doesnt smoke most of the time but power on and there is some initial haze, dont forget its still dark at night so any smoke is much more visible, the initial haze has been there for the two years I have owned the car.
Apparently oil temp sensor in the sump can also cause lumpy idle.
Important to note injector numbers dont all coincide with cylinder numbers.
Can I ask where you purchased your injector? I'm turning one up on eBay as cheapest option so far:
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Sorry cant remember as it was about a year ago I bought it, 120 quid springs to mind.
Ive just checked part number and its the same as the Ebay listing A2C59511364
11th Apr 2017 11:00 am
kayble
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Bargain - I can't find a new unit anywhere near that price!
11th Apr 2017 11:09 am
gilesharrison
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
Cheapest price I found recently for new VDO/ Siemens injectors was LRDirect.
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Thanks for thel link - what were your injector values if you dont mind me asking?
12th Apr 2017 9:54 am
gilesharrison
Member Since: 23 Oct 2016
Location: Penrith
Posts: 143
Haven't got the old values to hand but they were roughly
1350
1400
750
850
850
1100
I tried just replacing the two very high value injectors initially. This gave a big improvement in smoothness and mpg but the other older injectors then gave much higher values. I just did the lot.
12th Apr 2017 11:26 am
kayble
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Thanks for the info.
Injector change will be next month's project -as this month's money just got used on a new aircon condenser and recharge
15th Apr 2017 1:53 pm
kayble
Member Since: 01 Aug 2015
Location: Lincolnshire
Posts: 147
Injector change now on the cards - have purchased a new Siemens VDO injector from Island 4x4.
How do I get the two black solid fuel lines that are obstructing access to no.3 injector (middle injector on driver's side) out of the way?
Click image to enlarge
I can unclip them from the EGR coolant pipe but there's very little movement in them, where do they disconnect from - is it the fuel filter?
Admin note: this post has had its images recovered from a money grabbing photo hosting site and reinstated
13th May 2017 5:07 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10363
One is fuel filter
Other is the cooler down there.
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