Golf gti mk6 suspected dying turbo - or not?
Discussion
Been chasing a whistle/whine upon hard acceleration on my mk6 gti for the past month or two. The car has also started to consume more oil in this time frame. I’ve changed a leaky breather pipe and diverter/recirc valve to no avail.
A supposed vw indy has diagnosed it as new turbo needed based on the noise and they found oil leaking from the turbo itself. Compression test carried out was fine and all cylinders within tolerance. No oil deposits on spark plugs either.
My original thought was that the whistle was a boost leak as it only occurs 2-4000rpm and doesn’t pull as hard (but fine in upper rev range). Also would a failing turbo (oil seals) show up as smoke from exhausts and not an actual external leak?
Mileage is 130,000 so could well be the turbo. No engine lights on.
A supposed vw indy has diagnosed it as new turbo needed based on the noise and they found oil leaking from the turbo itself. Compression test carried out was fine and all cylinders within tolerance. No oil deposits on spark plugs either.
My original thought was that the whistle was a boost leak as it only occurs 2-4000rpm and doesn’t pull as hard (but fine in upper rev range). Also would a failing turbo (oil seals) show up as smoke from exhausts and not an actual external leak?
Mileage is 130,000 so could well be the turbo. No engine lights on.
Probably just a boost leak at that mileage. Usually the O rings in the bayonet joints. There are a few to check/replace throughout the boost pipe path.
Mine got replaced at 165K, but it still boosted OK with no smoke or noises. I just spotted some brass coloured dust in the oil pan during an oil change, and sure enough, there was a good half mill or so axial play in the turbo shaft. It wasn't far off compressor wheel rubbing housing fun and games. When that happens, you really WILL have a noise to diagnose. It's a very loud screech of death.
If you have VAG-COM, check the actual and requested boost pressure measuring blocks, and the N75 wastegate duty %.
Mine got replaced at 165K, but it still boosted OK with no smoke or noises. I just spotted some brass coloured dust in the oil pan during an oil change, and sure enough, there was a good half mill or so axial play in the turbo shaft. It wasn't far off compressor wheel rubbing housing fun and games. When that happens, you really WILL have a noise to diagnose. It's a very loud screech of death.
If you have VAG-COM, check the actual and requested boost pressure measuring blocks, and the N75 wastegate duty %.
rottenegg said:
Probably just a boost leak at that mileage. Usually the O rings in the bayonet joints. There are a few to check/replace throughout the boost pipe path.
Mine got replaced at 165K, but it still boosted OK with no smoke or noises. I just spotted some brass coloured dust in the oil pan during an oil change, and sure enough, there was a good half mill or so axial play in the turbo shaft. It wasn't far off compressor wheel rubbing housing fun and games. When that happens, you really WILL have a noise to diagnose. It's a very loud screech of death.
If you have VAG-COM, check the actual and requested boost pressure measuring blocks, and the N75 wastegate duty %.
If the actual boost was less than requested, wouldn't ECU flag this up resulting in EML on?Mine got replaced at 165K, but it still boosted OK with no smoke or noises. I just spotted some brass coloured dust in the oil pan during an oil change, and sure enough, there was a good half mill or so axial play in the turbo shaft. It wasn't far off compressor wheel rubbing housing fun and games. When that happens, you really WILL have a noise to diagnose. It's a very loud screech of death.
If you have VAG-COM, check the actual and requested boost pressure measuring blocks, and the N75 wastegate duty %.
Is it the o-rings in the air intake system from airbox to turbo or turbo-intercooler hoses?
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