Audi A4 avant tdi 130 2002 (51 plate)
Total novice I'm afraid, but wanting to have a go, or hoping for some reasurance.
I have noticed an oily mist appearing on underside of fancy engine cover trim. Taken cover off and it appears to come from the fuel intake manifold (high level), what I assume is the automatic choke. Black object with linkage arm adjusting butterfly.).
I removed the large diameter intake, just behind butterfly (crosses over top of engine coming from some sort of cooling/heating radiator) removing half circular spring clip first, fine oil is present inside tube.
Can anyone advise me if this is normal or does this need attention.
Much appreciated.
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well you shouldnt get mist on out of the pipes.
Do I understand that you have disconnected the intercooler (aka radiator thingy) hose - yes it is common to have a little oil in that.
I dont think you have an automatic choke and Im not sure what you mean Im afraid.
Can you see where the mist is escaping - I would guess that one of the clips or hoses on the crankcase vent is loose?
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Can you see where the mist is escaping - I would guess that one of the clips or hoses on the crankcase vent is loose?
Ditto these comments, my tdi 130 had no oil leakage anywhere under the bonnet at 46K miles, something must be loose/leaking. It is normal for the turbo to blow some oil mist into the intake pipework, but not to leak.
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Thanks chaps, I found this on the various forums. It seems that this is standard problem within intake hoses, eventually filling intercooler with sludge as well.
I still can't find where the actual leak is coming from though, no apparent loose hoses. Small hole in what I stupidly called the automatic choke (Now know it to be called anti shudder valve and solenoid). Could be from that?
Details taken from web site below. Really handy site for info.
tdiclub.com/TDIFAQ/TDiFAQ-7.html#f
Intake Manifold and EGR Cleaning - This vehicle is equipped with a CCV (crankcase vent) system and an EGR (exhaust gas recirculation) system. Oily fumes from the CCV system can combine with carbon particles from the EGR system to form a black sticky tar in the intake system. This eventually starts restricting the amount of airflow into the engine, resulting in gradual power loss as the vehicle ages and the intake clogging becomes worse. In rare cases a MIL ("check engine" light) may be tripped, with an intake manifold pressure control code set, but normally this does not happen and no codes are set. Operating conditions, fuel quality, oil quality, driving habits, and general condition of the engine all have some effect on how long the intake system survives before clogging up. It can be prevented (see section 7.8 below) and this recalibration is highly recommended for all TDI owners.
But if you didn't do that, and your vehicle is suffering from lack of power at higher engine speeds at all times, you need to clean the intake manifold. The following procedure is generic to all TDI vehicles. Individual vehicles may differ slightly.
Don't even THINK about cleaning the intake manifold without removing it from the vehicle ... engines don't like breathing solid particles.
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