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VW B5 Passat TDIs This is a general discussion about B5 Passat(>98 (2004-2005 in North America)). Non TDI related postings will be moved or removed.

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Old April 20th, 2017, 03:24   #1
Enkidu
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Default Boost pipes collapsing and starving engine

Hi

I'm really having trouble with my car, its a 1.9 AVF passat 4motion. Bit of background...

Car broke down last week, boost pipes collapsed and it wouldn't start. I ended up popping off the pipe to get me home. I had a cheap ebay recon turbo on there, I have now changed that for a proper one but its still doing it. I'm so gutted as now i'm changing parts that weren't faulty. What else can it be?
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Old April 20th, 2017, 08:22   #2
imo000
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How can a boost pipe collapse? Is it kinked or collapsed? Post a picture of the collapsed pipe.
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Old April 20th, 2017, 14:15   #3
Enkidu
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Quote:
Originally Posted by imo000 View Post
How can a boost pipe collapse? Is it kinked or collapsed? Post a picture of the collapsed pipe.
Good question, how... I will get some pics up tomorrow morning. I mean like a McDonald's straw collapsed from thick milkshake.
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Old April 20th, 2017, 14:26   #4
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Which hoses collapsed? Have you checked the intake for blockage?
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Old April 20th, 2017, 15:11   #5
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I go with blockage
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Old April 20th, 2017, 23:27   #6
Enkidu
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Originally Posted by 1854sailor View Post
Which hoses collapsed? Have you checked the intake for blockage?
Had the intake off loads, nothing there. Unless the paper air filter somehow sealed the air off (it's recently replaced) i cant see what's blocked. The pipes i can immediately see that's vacuumed tight is the two before and after the intercooler. Only thing before there is the hardpipe that runs under radiator and the pipe that goes to the turbo. I will take the whole lot out and check again... Can they somehow delaminate internally ??
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Old April 21st, 2017, 04:36   #7
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I found a soft section on the turbo to hardpipe part of the boost hoses... I wonder if that's collapsing when I'm off throttle? 130 part FFS.
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Old April 21st, 2017, 07:14   #8
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That is the turbo discharge and is normally under pressure. Even at low boost, all that changes are the inlet guide vanes that are on the exhaust side, so no restriction on the intake side. Try a different air cleaner. Failing that, open things up and use a vacuum cleaner to check for obstructions in the charge air circuit. 130 GBP is cheap for that hose compared to North American prices.
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Old April 21st, 2017, 08:15   #9
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Pull the air filter and go for a short drive.
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Old April 21st, 2017, 08:38   #10
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This happened to Matt98AHU on his 98 Jetta. It took him a while to figure out what the problem was :0

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Maybe I should pay MYSELF to do bad work on my car!
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Old April 21st, 2017, 08:41   #11
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Quote:
Originally Posted by compu_85 View Post
This happened to Matt98AHU on his 98 Jetta. It took him a while to figure out what the problem was :0

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Don't leave us hanging or anything...
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Old April 21st, 2017, 08:42   #12
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Quote:
Originally Posted by compu_85 View Post
This happened to Matt98AHU on his 98 Jetta. It took him a while to figure out what the problem was :0

-J
Well, what was it?
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Old April 21st, 2017, 08:46   #13
Enkidu
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Yeah it's up and running, it was the boost pipe just aged and had a soft spot. Car back up and running, cheers all.
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Old April 21st, 2017, 09:19   #14
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Quote:
Originally Posted by 1854sailor View Post
Well, what was it?
I can't remember the exact details Before I say something wrong I'll let Matt comment

-J
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99.5 Jetta "GLX" TDI. 310,000 miles. Half way there!!! Power Memory Seats, HIDs 11mm pump, BV39 Turbo, RCIII 36/47 MPG.
1991 Mercedes 350SDL 230,000 miles, 70,000 on engine. 18/27 MPG.
Past:
1988 Audi 5000S Quattro, 1992 Jetta ECOdiesel, 1991 Jetta ECOdiesel.

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Quote:
Originally Posted by BRUSSELS BELGIAN View Post
Maybe I should pay MYSELF to do bad work on my car!
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