.: AUDI KLUB POLSKA :.

Hi,

my name is Steffen and google helped me to find this forum.
I dont speak polish, so i try it in englisch
Im from germany and have a problem with my V6 TDI BDG engine 142.000km.

I went to a local Bosch Service here in Germany because the engine wont fire well the first time i start it a day.
It did smoke a couple of seconds after start, even sometimes in the summer.

Bosch checked VP44...but its o.k.
Thay find out, that one glow plug was damaged and they changed it.
They also did a compression test, with bad results:



As you can see, the left bank (Cyl. 4, 5 ,6 ) looses compression continuously, but why?
This test was done with the engine beeig cold.

I also can see, that when im logging Block 13+14, and start the car with cold engine, the values are bad:

http://imageshack.us/photo/my-images/607/1314f.jpg/

So, all i know is, that a negative value like cyl. 5 and 6 indicates, that this Cyl. is stronger than the Ref. Cyl. 2 and that it gets smaller amount of fuel.
But how? They should habe pos. values, because of the bad compression?

Can you image what is bad with the engine? Bad piston rings, cams or could it be, that the Inlet manifold is plugged, so that bank gets less air from 4-6?
I dont have to fill up oil between the service intervall, also no loss of water.

All i know is, that my flyweel isnt in best condition.
Since the Service installed a new glow plug and Battery, the car did not blow any smoke after cold start.
But now we have winter, so it could be, that preglowing hides this problem, so that it might occur in the summer.

What to do next? Dissasembly the head?
Hope someone could help.

Greetings Steffen

Try to do oil probe.
After this you know, if it is bad piston ring or inlet and exhaust valves.

proba olejowa w dizlu ?

I will try this next weekend i guess.
But normally the rings should all worn out the same right?

I really hope its because of an leaking valve...

btw: anyone knows the compression data from bdg engine?
heard two different values:

1.) worn 17 bar, new 24-27 bar
2.) worn 24 bar, new 27-31 bar

what is right?

New engine should have 31-32 BAR. Wreck engine have ~19-20 BAR. Maximum difference between cylinders is 5 BAR.
Your engine is in bad condition - difference between cylinder no 1 and no 6 is > 6 BAR.
My 14 years old engine with 370 kkm have 30,30,30,29 BAR or the second one have 32,32,32,31 BAR.

I think that you should check the head gasket (cylinders 4-6).
I hope your engine has not been overheated ...

Good luck.

Very strange in know ;(
How can i test the Gasket without removing the head?
Leak down test?
But is it possible, that a gasket gets broken between all three cyl.?
Therefore the compression should nearly equal between two cyl or not?

I dont know, if the engine ever overheated...
Nothing in relation to this is mentioned in the cars history ive got from Audi.

If so, the whole engine is crap right?
When the car glows a few seconds, the engine starts okay, no smoke.
I hate this car

I didn`t say that your engine is crap, but it is in bad condition.
Everything is possible including damaged head, head gasket, pistons or crankshaft ...
146 kkm and compression 22,5 BAR ... it`s not okay.
Pregloving is not the solution of your problem.
01/013 is not okay because compression it`s no good too. ECU tries to stabilize iddle, so values are different ...
You should dissasembly the head(s) and find the problem. Compression on cylinders 1-3 is not perfect ...

BTW: TDI in good condition does not requires glows to cold start, just make it easier.

Hey,

thanks for your answer, but can you explain, why 013 on cyl.5 for example shows negative values?
The Compression isnt as good as the reference cyl, so it should show positive values.
Pos. Values = More fuel = more power to wipe out loss of Compression?

Is it possible, that the Crankshaft is damaged, because of the Flywheel?
It was replaced @ 70kkm, due the starter didnt disconnected after start and damaged the ring gear.

I will check what i read here the days after christmas.
One question:

Can I remove the inlet manifolds installed on the heads, without having fear, that the OIL/Carbon Mix is dropping into the engine?
I removed the front inlet manifold connecting both of the manifold on the heads and locked in the manifold from Cyl- 4,5,6.
There is really lots of dirty mud in it ~5mm thick or so i guess.

Is it possible that the cam can twist, so that timing isnt correct anymore?
Heard the new cams can also get broken...

Hallo zusammen,
Aus meiner Sicht das sieht so aus:
Du hast sechs Zylinder, 5 normalen Spritzen und 1 speziell „mit dem Kabel“… Steuergerät verwendet es für die Kalkulationen aber die Werte werden nicht mit diesem „mit dem Kabel“ vergleicht sondern mit dem nr2 – meiner Meinung nach diese Logik ist so bescheuert dass es keine Sinn hat viel darüber nachzudenken: was bedeutet minus und was plus? Bei Fahrzeugen 10+ Jahre alt meistens Korrektionen sind „minus“ was natürlich kein Sinn hat – alle Zylinder sind „schlechter“ oder „besser“ als nr 2?
Vielleicht Spritzen sind (auch) wie Hitler…kaputt?
Pa ruski plocha-)
Wypilem kilka browarow .. wiec sorry
Ja do tej owropy chyba nie doroslem
Gruss,
Przemek

Well, okay...might be, that it isnt very accurate.
i dont think, that my injectors are broken, because bosch tested them...

Positive value = the cylinder gives less power.
Negative value = the cylinder gives more power.
This is the theory.
I just read that youre measure was done with cold engine ?
Try again on hot engine (90st C).



I really dont`t think so.

Yes, you can , but use the vacuum


Hmmm ... i dont think so, it should be reason for losing power, not compression.

But i have an idea ... check every copper gasket under every fuel injector.
Few months ago i had problem with AHU ( 1,9 TDI R4) engine, which produced strange sounds (pss,pss,pss) and had less power then usually.
This sound it was "music" of compression losing between head and injectors ...
013 was bad ...

Check this out. If i`m right - injectors will be black and dirty.

@ przemek74 - mógłbyś w jakimś normalnym języku ?

Okay, i will do so.
In 013 its the same with the warm engine, but all cylinders are in the tollerance.
Worst cyl. somewhere around -0,39 to -0,63.

Just after a minute i start the engine cyl. 5 and another is out of max allowed, than all is okay.
When the engine is warm and my AC is OFF, sometimes fuel quantity drops lower than 3mg/h and the engine shakes a little.
When AC is on, fuel quantity goes up and engine shakes less...

I replaced the gaskets when we tested the injectors...
My thoughts where, that maybe the cam twists, so that the timing changed?

Dont really know, but the compression on the left bank looks very confusing hmm...

Just like i thought in 013 everything is okay.
We do not test 013 until engine is > 80 st C. !!! That was my mistake ...
It seems that your ECU and VP44 is working properly.
Let`s leave 013 ...

So what about your BDG ?

You said cam twist ... did you heard noise from the head ?

Hmm if i open the oil inlet i guess somethink is squeking.
Dont know if this is normal. You have to listen very careful to hear IT.

When oil inlet is open, you can see white oil fog rising up.
Smells like oil....

What i also found out is, that if disconnect the egr, i sometimes hear a frequently bumping sound out of my air Box.
Wupp, wupp wupp ...