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Author Topic: Locating boost leaks  (Read 2379 times)

Offline GregUK

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Locating boost leaks
« on: 03 June 2009, 21:55 »
Am I right in thinking that it's possible to locate boost leaks using an air compressor and listening for escaping air? If so, which pipe would I be best connecting the compressor to?

Thanks :smiley:
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Offline Rhyso

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Re: Locating boost leaks
« Reply #1 on: 03 June 2009, 21:59 »
Quote from: GregUK on 03 June 2009, 21:55
Am I right in thinking that it's possible to locate boost leaks using an air compressor and listening for escaping air? If so, which pipe would I be best connecting the compressor to?

Thanks :smiley:

i believe most people create a plug which fits into the TIP which the air compressor then fits into and pushes air around the system
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Offline GregUK

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Re: Locating boost leaks
« Reply #2 on: 03 June 2009, 22:21 »
Quote from: Rhyso on 03 June 2009, 21:59
i believe most people create a plug which fits into the TIP which the air compressor then fits into and pushes air around the system

Cool, I'll give that a go. What sort of pressure should I put through the system to simulate the running pressure of a 1.8T?
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Offline Steve_PD

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Re: Locating boost leaks
« Reply #3 on: 03 June 2009, 22:24 »
11 bar  :lipsrsealed:






14-17 psi  :wink:
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Offline Rhyso

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Re: Locating boost leaks
« Reply #4 on: 03 June 2009, 22:24 »
Quote from: GregUK on 03 June 2009, 22:21
Quote from: Rhyso on 03 June 2009, 21:59
i believe most people create a plug which fits into the TIP which the air compressor then fits into and pushes air around the system

Cool, I'll give that a go. What sort of pressure should I put through the system to simulate the running pressure of a 1.8T?

not sure - turbo boosts at approx 8-9PSI as standard; 15-17PSI if mapped
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Offline GregUK

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Re: Locating boost leaks
« Reply #5 on: 03 June 2009, 22:39 »
The car hasn't been remapped (yet) :smiley:

I'm getting code 17705 along with the symptoms to go with it. I've checked all of the hoses and can't see anything obvious, but I'm convinced there is a leak. I'm guessing I'll see the pressure drop before it reaches 8-9 PSI.
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Offline T_J_G

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Re: Locating boost leaks
« Reply #6 on: 04 June 2009, 09:00 »
Could be the one in the wheel arch?
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Offline GregUK

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Re: Locating boost leaks
« Reply #7 on: 04 June 2009, 09:35 »
Quote from: T_J_G on 04 June 2009, 09:00
Could be the one in the wheel arch?

The pancake pipe? I couldn't see any damaged hoses or anything, but I suppose the joint could be leaking.
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Offline dubcruiser

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Re: Locating boost leaks
« Reply #8 on: 04 June 2009, 09:59 »
Quote from: GregUK on 04 June 2009, 09:35
Quote from: T_J_G on 04 June 2009, 09:00
Could be the one in the wheel arch?

The pancake pipe? I couldn't see any damaged hoses or anything, but I suppose the joint could be leaking.

Would check this, in fact take it apart and clean up the joint. Mine was leaking there, as it had oil residue that had ran from the leak down the pipe. Remade the joint and the BOOST is back!!  :wink:
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Offline GregUK

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Re: Locating boost leaks
« Reply #9 on: 04 June 2009, 10:08 »
Quote from: dubcruiser on 04 June 2009, 09:59
Would check this, in fact take it apart and clean up the joint. Mine was leaking there, as it had oil residue that had ran from the leak down the pipe. Remade the joint and the BOOST is back!!  :wink:

Excellent! Will check this first then as it sounds like a common weak spot.
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