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Sc0tt
Member Since: 03 Aug 2014
Location: Brisbane
Posts: 43
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Hi All
MY06 D3 2.7l HSE with 140,000km. Have had this car for a few months (had my first D3 for 5 days before written off in a hail storm) and have noticed that sometimes at very low speeds with either a very low throttle input (ie barely touching the throttle) or no throttle input the rpm will dip sharply from idle (around 800rpm) to <500rpm and then recover. Sometimes it gets into a cycle and does this over and over.
Car has had EGR bypass including the throttle plate. Did that the day I got the car, so can't say if it started after this. Full service history. Have cleaned the MAP and MAF. On moderate to hard acceleration I have a turbo whistle from left side of car (loud enough to be clearly heard in the cabin with all windows up, a/c on and radio on). Don't think there is an air leak from when I did the bypass, but it does concern me. I don't think there is a leak as Torque shows some vacuum at idle (0.5mmhg) and about 18.5psi at full song. Not sure if this is reasonable as this is my first oil burner. No fault codes from Torque, but Torque probably can't read anything LR specific.
Any ideas?
Cheers
Scott
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 27th Feb 2015 12:09 pm |
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HughMartin
Member Since: 30 Mar 2008
Location: Aberdeenshire
Posts: 751
  
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I had similar symptoms a month or so ago with a similar aged car. Is yours a manual gearbox? Mine tended to be worse when slowing to a stop after I had pushed the clutch pedal. RPM would drop right down and I thought it was about to stall. It would not occur however if I knocked it into neutral whenever I pushed in the clutch. Is this the same as yours?
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| 27th Feb 2015 1:22 pm |
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amazing
Member Since: 05 Mar 2011
Location: chengdu
Posts: 1542
 
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running lean for a bit my maz had same but had throttle pot tweeked.
basic cause is engine gets more air before it realises. check for air leaks on inlet and MAF sensor.some throttle potentiometers change value over time (my old cossie did)
just some thoughts.. It is better to have and not need it then need and not have it.
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| 27th Feb 2015 1:34 pm |
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doz
Member Since: 15 Jun 2014
Location: Southampton
Posts: 436
  
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Check the oil temp sender in the sump. Mine does this normally when you just go to pull away. Oil temp when it happens is either -30°C or even open circuit.
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| 27th Feb 2015 3:21 pm |
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Sc0tt
Member Since: 03 Aug 2014
Location: Brisbane
Posts: 43
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Thanks for all the ideas.
Car is an auto, sorry for not stating that earlier. In Aus, they were pretty much all auto.
Oil temp sender is an interesting idea. I don't think Torque can read this value, though I will double check. TB pots are a thought. I suppose an IIDTool or similar would be able to read these values? Might be the excuse I need to buy one!
I will check over the intake again for any sign of leak, but how in the world do you check for that on a diesel? For a petrol car it is easy as you have high vacuum at idle. Is it just a visual inspection for a diesel?
Cheers
Scott
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| 28th Feb 2015 1:03 am |
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doz
Member Since: 15 Jun 2014
Location: Southampton
Posts: 436
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Cecking for air leaks on diesel. Get a can of easy start in Aus i think it's call it start er barstead! Or even brake cleaner. Spray it on the joints or suspect areas at idle. If you've got a leak the idle speed will increase. Nanocom definitely displays oil temp as that's what I use. Can't answer for IID as I've never used it.
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| 28th Feb 2015 1:13 am |
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Sc0tt
Member Since: 03 Aug 2014
Location: Brisbane
Posts: 43
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Ah, I get it. You are relying on the venturi effect to suck air in through the leaking joint. Obvious now that you mention it! I actually have a can of start ya b  d in the shed. Bought it years ago when I was into old Alfas. Never had to use it.
Cheers
Scott
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| 28th Feb 2015 1:22 am |
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amazing
Member Since: 05 Mar 2011
Location: chengdu
Posts: 1542
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old Alfas. Never had to use it..........you're not fooling anyone... It is better to have and not need it then need and not have it.
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| 28th Feb 2015 2:47 am |
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Sc0tt
Member Since: 03 Aug 2014
Location: Brisbane
Posts: 43
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Hey! My Sud, 2x 33's and 90 were some of the most reliable cars I ever owned. Cheap as chips too, 'cause everyone thinks they are unreliable. As soon as you undo all the previous owners 'enhancements', they are great.
Anyway, back on topic. Sprayed every junction with start ya b d and idle was rock steady. Yay! No intake leaks.
Cheers
Scott
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| 28th Feb 2015 5:39 am |
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BBB
Member Since: 01 Apr 2015
Location: Chester
Posts: 269
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Has there been any solution to this as i have similar problem i think. Very rough idle, nearly stalling
Mine is a manual so is there any thing Hugh Martin can add
Now my garage are saying needs a new turbo 
But would a clutch problem cause this, tends to happen at junctions and when not moving too fast, thought maybe a clutch release issue as gear change has got more difficult recently and SWMBO has reported that the car has tried to pull of a couple of times even though clutch depressed, although i am sure she makes these symptoms up half the time to throw my thinking off
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| 20th Apr 2015 11:33 pm |
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HughMartin
Member Since: 30 Mar 2008
Location: Aberdeenshire
Posts: 751
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Hi BBB,
I wouldn't have described my problem as rough idling. When I applied the clutch before coming to a stop, the rpm would drop excessively low (nearly stalling) before recovering to a normal idle.
I had assumed mine was being caused by "clutch drag" as it wouldn't happen if I knocked it out of gear before I slowed to a stop. I was beginning to prepare myself for a clutch replacement (circa 155,000miles on original clutch)
During this period, I had been suffering from an EPB problem and I had pulled fuse no. 9 (if that is the one which supplies the EPB - I'm not near my car to check). For some reason, this also stopped cruise control from working.
Once I had the EPB problem sorted (it was a corroded splice in a wire) I replaced the fuse and all was well including no more engine idle problems. Can't explain why.
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| 20th Apr 2015 11:49 pm |
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eightfoot
Member Since: 12 Apr 2015
Location: sunny essex
Posts: 762
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epb fuse also runs the anti stall system so if you remove it then no anti stall and also no cruise control 
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| 21st Apr 2015 9:52 am |
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HughMartin
Member Since: 30 Mar 2008
Location: Aberdeenshire
Posts: 751
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Thanks Eightfoot. One of my life's mysteries solved.
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| 21st Apr 2015 11:09 am |
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