Boost problems

[Ma6A6]

Hello everyone!!

I've been here for a while reading and learning a lot for my A6. Now as a new owner of an A4 2.0T (my first turbo car) I need to learn a lot more.

Right now I have some issues with it. P0299 and the car feels slow, really slow at starts. After reading here I checked the DV and it is OK, it is a G version but looks really good, just found a lot of oil in the connector and I'm not sure it should have been there.

Today I went for a ride with my vagcom and logged RPMs, 115/3 and 115/4...

I'm not sure what to look for now... I think there is no boost leak (can't hear nothing) and there is little axial play in the wastegate (just in and out, no lateral, where it enters the turbo).

Any suggestions will be greatly appreciated.

TIA

Mauricio

[Okedokey]

Check your diverter valve.

[Ma6A6]

Check your diverter valve.

Thanks Okedokey, I have done that... it is ok. A G version but is ok, just a lot of oil in the connector...

[Okedokey]

Sorry missed that, sound like your turbo might be gone then if its passing through that much oil.

[pezgoon]

Well it could be the pcv system or a cracked valve cover as well

Although you checked the dv if it was the diaphragm style and looked ok it still may not have been and may be worth replacing

You could also remove the inter coolers and see if they are full of oil, if so then you have to chase down where the oil is coming from


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[Ma6A6]

Well it could be the pcv system or a cracked valve cover as well

Although you checked the dv if it was the diaphragm style and looked ok it still may not have been and may be worth replacing

You could also remove the inter coolers and see if they are full of oil, if so then you have to chase down where the oil is coming from

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Thanks Pezgoon, today I checked the PCV blowing towards the engine and it was blocked... also there is some vacuum if I try to remove the oil cap.

should I think on adjusting the wastegate rod?? there is a little rattle sound when I loose the accelerator from 2000 to 1000 rpm

[Sanjman]

Your PCV is still f'ed. Replace it first. Then try a new DV. It is sometimes hard to miss a tear. I'd buy your new DV and PCV if it didn't fix it.

Also you haven't even chased the basic... valve cover could be broken. Valve cover gasket, Vacuum pump could be leaking. Oil filter gasket. Intake piping. Spark plugs coil packs. N75 (wastegate actuator) Wastegate adjustment isn't a fix it's a workaround when you are all out of options.

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[pezgoon]

I have read about people's dv looking perfectly fine but still causing the issue/code and they had to replace it and then it worked all hunky dory but I do agree with what you said above


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[Ma6A6]

Thanks!!

Next weekend I'll go for the basics and report...

[Ma6A6]

Well... finally yesterday I was able to work on my car. I replaced PCV, DV and N80 Valve but no improvement at all... so far only P0299 code is present.

I still have to do a Leak test to verify Intercoolers and tubing (any DIY for this would be really appreciated) and check the N75 valve.

Is disconnecting the wastegate hose in the N75 to see if this restores the boost the right way to test it???

Any suggestions are welcome since my experience with turbos is limited.

Thanks in advance.

[NickSchooler]

I've been running P0299 right before mechanic. Had him see what the code was and he was claiming it was caused by altitude (around 8,000 feet). That was about 3 weeks ago and I'm still running the code. Looks like I have some stuff to look at.

[80sGuy]

Just noticed some thin coating of oil residue around the valve cover gasket by the oil filler. No boost problems though. Maybe needs a new gasket? I do feed about 1/2 qt oil every 1500 miles or so.

[Ma6A6]

Well, at the end the problem was the waste gate... After removing the four nuts to check the Catalytic converter I decided to check the the wastage valve and the flapper was loose so I adjusted it.

Without any pressure in the actuator I was able to turn the adjusting nut like 3 turns, after that I applied pressure to the actuator and give it 1 turn more, reassembled everything and now it is boosting 11psi.

Thanks to all who takes some time to help me!!!