theinternot
Veteran Member
'06 Jetta TDI
5MT
101k
GIAC Tune
I will try and keep this brief.
I have been trying to trouble shoot a noise for months now. I thought that replacing the EGR cooler had done it, but nope. It's still there.
The noise from inside sounds like a loud metallic, rushing, whooshing, shooshing sound when boost starts to kick in. It seems to originate from near dead center behind the block. During this time I have no power and I feel almost like my clutch is slipping. At about 2400-2600 it "catches", noise disappears, a slight hollow ring right at the end, and then full power returns.
I can make it happen like clockwork. Takes about a full 1-2 seconds to complete, but if I hold the throttle just right I can make it do it for an extended period of up to several seconds.
i also noticed that at idle when I stab the throttle I get a ton of black smoke and the engine will hiccup or flutter for a second.
I originally thought this noise was an issue with the transmission, because it seemed to have started right after doing an SMF conversion... from the inside of the car it seriously sounds metallic, however, from the outside it sounds entirely like boost leak.
What have I done so far?
- Boost leak test = not a squeek
- EGR Cooler replaced = runs slightly better
- Inspected all the intercooler pipes = nothing that would indicate a leak from a crack or slipped connection
- Inspected manifold (as best as I could from underneath). No indications of soot or oiliness except for right below turbo inlet... seems it is leaking right at the coupler.
- turbo inlet had small amount of oil pooled at bottom, no apparent lateral movement of the impeller, didn't test in/out movement. The impeller won't spin even one full revolution if I give it a good twist or blow compressed air at it... so not sure if that is an indication of bad bearings or not.
I did a boost map with VCDS, but I don't know exactly what it is I am looking at. I also rigged a video camera to various areas of my engine bay and got some good recordings, and I have a couple of pics. If you have a moment could you please take a look and see if you could offer up some advice?
Thanks a lot.
Videos (3):
1. Recorded from top of hood looking down at engine (turbo is in rear):
http://www.youtube.com/watch?v=q_v1Nvtu13g
2. Recorded from driver side, near rear. Please exscuse my gear crunching. For some reason the transmission didn't want to go in reverse no matter what...
http://www.youtube.com/watch?v=x1bQNgsloZQ
3. Next to turbo, pointing down almost directly above it:
http://www.youtube.com/watch?v=blfOdi9bUNE
Pics (2):
VCDS BOOST MAP (click to enlarge):
Each spike is a gear shift. The first set being more aggressive than the second set.
TURBO INLET (this is from when I first was trying to figure this noise out a couple of months ago):
5MT
101k
GIAC Tune
I will try and keep this brief.
I have been trying to trouble shoot a noise for months now. I thought that replacing the EGR cooler had done it, but nope. It's still there.
The noise from inside sounds like a loud metallic, rushing, whooshing, shooshing sound when boost starts to kick in. It seems to originate from near dead center behind the block. During this time I have no power and I feel almost like my clutch is slipping. At about 2400-2600 it "catches", noise disappears, a slight hollow ring right at the end, and then full power returns.
I can make it happen like clockwork. Takes about a full 1-2 seconds to complete, but if I hold the throttle just right I can make it do it for an extended period of up to several seconds.
i also noticed that at idle when I stab the throttle I get a ton of black smoke and the engine will hiccup or flutter for a second.
I originally thought this noise was an issue with the transmission, because it seemed to have started right after doing an SMF conversion... from the inside of the car it seriously sounds metallic, however, from the outside it sounds entirely like boost leak.
What have I done so far?
- Boost leak test = not a squeek
- EGR Cooler replaced = runs slightly better
- Inspected all the intercooler pipes = nothing that would indicate a leak from a crack or slipped connection
- Inspected manifold (as best as I could from underneath). No indications of soot or oiliness except for right below turbo inlet... seems it is leaking right at the coupler.
- turbo inlet had small amount of oil pooled at bottom, no apparent lateral movement of the impeller, didn't test in/out movement. The impeller won't spin even one full revolution if I give it a good twist or blow compressed air at it... so not sure if that is an indication of bad bearings or not.
I did a boost map with VCDS, but I don't know exactly what it is I am looking at. I also rigged a video camera to various areas of my engine bay and got some good recordings, and I have a couple of pics. If you have a moment could you please take a look and see if you could offer up some advice?
Thanks a lot.
Videos (3):
1. Recorded from top of hood looking down at engine (turbo is in rear):
http://www.youtube.com/watch?v=q_v1Nvtu13g
2. Recorded from driver side, near rear. Please exscuse my gear crunching. For some reason the transmission didn't want to go in reverse no matter what...
http://www.youtube.com/watch?v=x1bQNgsloZQ
3. Next to turbo, pointing down almost directly above it:
http://www.youtube.com/watch?v=blfOdi9bUNE
Pics (2):
VCDS BOOST MAP (click to enlarge):
Each spike is a gear shift. The first set being more aggressive than the second set.
TURBO INLET (this is from when I first was trying to figure this noise out a couple of months ago):
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