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Model specific boards => Golf mk4 => Topic started by: GregUK on 03 June 2009, 21:55

Title: Locating boost leaks
Post by: 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:
Title: Re: Locating boost leaks
Post by: Rhyso 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
Title: Re: Locating boost leaks
Post by: 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?
Title: Re: Locating boost leaks
Post by: Steve_PD on 03 June 2009, 22:24: 11 bar :lipsrsealed:

14-17 psi :wink:
Title: Re: Locating boost leaks
Post by: Rhyso 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
Title: Re: Locating boost leaks
Post by: GregUK 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.
Title: Re: Locating boost leaks
Post by: T_J_G on 04 June 2009, 09:00: Could be the one in the wheel arch?
Title: Re: Locating boost leaks
Post by: 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.
Title: Re: Locating boost leaks
Post by: dubcruiser 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:
Title: Re: Locating boost leaks
Post by: GregUK 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.
Title: Re: Locating boost leaks
Post by: T_J_G on 04 June 2009, 10:36: I need to check mine actually. Try and solve this boost issue!