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Audi A4 2.0 TDI DPF (B7) BRD – Uneven idle & smoking on idle

Posted By A11an Tuesday, October 23, 2012 8:22:07 AM
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A11an
 Posted Tuesday, October 23, 2012 8:22:07 AM
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Hi

I have an Audi with idle smoking issues, the story so far

Jan 12 – Recalled to Audi for injectors, 3 months later it starts to get uneven and slight smoking on idle.

When the engine starts getting lumpy after starting the readings are as below, if I give it a good rev it clears for 30 seconds the cyl 4 comes right down to the same as the other cylinders but then goes back up with lumpy running. See readings below when lumpy.

Group 13 Idle stabilization (Injector Quantity Deviation)
-0.19 mg/str cyl 1
-1.46 mg/str cyl 2
-0.62 mg/str cyl 3
2.28 mg/str cyl 4

I swapped No.1 & No.4 injectors over, and the engine ran fine on idle with no smoke with the idle stabilization readings

Group 13 Idle stabilization (Injector Quantity Deviation)
-0.09 mg/str cyl 1
-0.28 mg/str cyl 2
-0.68 mg/str cyl 3
-0.29 mg/str cyl 4

I took it out for a hours drive, parked it up for 2 hours and when started it was uneven and smoking again on tick over and the reading had swapped with the injector, see below,

Group 13 Idle stabilization (Injector Quantity Deviation)
1.83 mg/str cyl 1
-0.54 mg/str cyl 2
-0.59 mg/str cyl 3
-0.69 mg/str cyl 4

So from here I fitted a new injector to No.1, started it up and it smokes like it’s never smoked before, thinking the wiring loom may have a fault I also fitted a new one too.
It ‘s almost like the ECU wakes up in a different mood every time it’s started! Could it even be a high pressure pump problem?

Here's a snapshot today.

Address 01: Engine (03G 906 018 AQ)

08:25:39
875 /min Engine Speed (G28)
274.6 mg/str Exhaust Gas Recirculat. (actual)
57.0°C Fuel Temperature (G81)
27.0°C Intake Air Temperature (G72)
280.9 mg/str Mass Air Flow (actual)
1011.4 mbar Atmospheric Pressure
-0.34 mg/str Injection Quantity Deviation Cyl. 1
-0.12 mg/str Injection Quantity Deviation Cyl. 2
0.47 mg/str Injection Quantity Deviation Cyl. 3
-0.01 mg/str Injection Quantity Deviation Cyl. 4
76.0°C Oil Temperature
1013.9 mbar Boost Pressure (actual)

Is the injector coded or need adapting? Any help on this would be greatly appreciated, please go easy on me if I missing something.

Thanks

Allan
SB126
 Posted Tuesday, October 23, 2012 12:44:01 PM
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If you think its down to injectors that were fitted on recall by Audi.

3 months ago

Have you spoken to them.?
laldog
 Posted Tuesday, October 23, 2012 6:20:35 PM
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We have replaced 2 heads for "slack" injectors on these. Remove the injectors,smear a wee bit of sealant around the side and refit,if this helps for a week or few then returns a new head will cure it.
Disgusted
 Posted Wednesday, October 24, 2012 2:43:37 PM
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Compression test?
tk
 Posted Wednesday, October 24, 2012 5:57:54 PM
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Have you checked the diesel to see if there is any contamination,
Crasher
 Posted Thursday, October 25, 2012 7:55:36 AM
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I am hearing a lot of people with problems after the injector recall on various cars affected. Of the significant number of sets of new ones I fitted before the recall, two injectors failed, one immediately and the other about 18 months later, thankfully still in Audi warranty.

Vile Invention

Dark was that day when Diesel conceived his grim engine that begot you, vile invention, more vicious, more criminal than the camera even, metallic monstrosity, bale and bane of our culture, chief woe of our Commonweal. How dare the Law prohibit hashish and heroin yet license your use, who inflate all weak inferior egos? Their addicts only do harm to their own lives: you poison the lungs of the innocent, your din dithers the peaceful, and on choked roads hundreds must daily die by chance-medley. Nimble technicians, surely you should hang your heads in shame. Your wit works mighty wonders, has landed men on the Moon, replaced brains by computers, and can smithy a "smart" bomb. It is a crying scandal that you cannot take the time or be bothered to build us, what sanity knows we need, an odorless and noiseless staid little electric brougham.

W.H. Auden (1907-1973), A Curse:


Thursday, October 25, 2012 7:56:09 AM by Crasher
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 Posted Saturday, October 18, 2014 1:09:53 PM
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Hi guys

i think i have managed to find the problem its the engine oil as i have changed mine and stop smoking and run really well changed it today got actually my engine oil and filter from vw not audi retail shop and my car is running sweet no smoke at all let me get the parts details for you all

1. 5 litre quantum vw 507 long life make sure u dont put more then 4.0 litre thats max the recommended capacity is 3.8
2. 001h01 filterelem ie the oil filter

what i have realised it audi with dpf need special engine oil and in the past all other retailers were giving me wrong engine oil

now i know when ever car smokes like that i will change my engine oil and filter i wont wait till 10k ...



i hope it will sort out most of you guys
wor-mate
 Posted Sunday, October 19, 2014 1:22:32 PM
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following from crasher's post i have seen many bkp passats with same probs.

a master tech told me that many times he has seen the injectors go in and the rocker shaft fitted, no adjustments made, bang rockerbox on and get it out the door.

then months later the problems start.

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