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DISCO3.CO.UK > Faults & Fixes (D4)

Vacuum line help
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LandyR93
 


Member Since: 02 Jun 2025
Location: Northamptonshire
Posts: 4

United Kingdom 
Vacuum line help

Does anyone have a diagram of the vacuum set up? I’m having restricted performance when over 2800rpm. It’s had smoke test and nothing shown or visible. A few loose pipes on the t pieces which I’ve sorted. I’m just not sure if someone has messed with them previously and now not correct.

I’ve put a new turbo control solenoid on.

3L TDV6 2010 D4.

I have a gut feeling the pipes are wrong way round on something potentially!? Photos attached. Is it correct that a vacuum pipe comes round the front of the radiator and into the bottom of a solenoid?

Any support appreciated.

Only a few weeks ago body off for two new turbos, cross over pipe and a few other bits.

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Post #23936954th Jun 2025 8:39 pm
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karlos01
 


Member Since: 18 May 2025
Location: norfolk
Posts: 10

United Kingdom 2010 Discovery 4 3.0 TDV6 Base 7 Seat Auto Siberian SilverDiscovery 4

following that's as have same issue
spoke to local indy garage and the chap said some times the o ring from the MAF sensors can fail and let air come in
could be worth a look  
Post #23938557th Jun 2025 8:04 am
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LandyR93
 


Member Since: 02 Jun 2025
Location: Northamptonshire
Posts: 4

United Kingdom 

Let me know how you get on. My local Indy has said he thinks the air pipes have been messed with before and potentially not put back the correct way which is why I’m trying to find a drawing. I’ve checked over visible pipes no splits or cracking. Replaced turbo control solenoid and on gap still getting

P22D3-77 (2F) Turbocharger turbine inlet valve stuck closed - Mechanical failure - commanded position is not reachable

P22CF-71 (2A) Turbocharger turbine inlet valve control circuit - Open - Mechanical failure - actuator is stuck

Both turbos replaced two weeks ago with brand new garrett turbos plus other bits.  
Post #23938577th Jun 2025 8:30 am
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karlos01
 


Member Since: 18 May 2025
Location: norfolk
Posts: 10

United Kingdom 2010 Discovery 4 3.0 TDV6 Base 7 Seat Auto Siberian SilverDiscovery 4

yeah will do I'll have look when I get chance
need to pop mine on diagnostic and see codes I'm getting mabey ask in the general chat see if some one has a PDF of workshop manual for a D4  
Post #23939368th Jun 2025 4:00 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6369

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

Have you checked that the TSOV is not stuck, its a common thing on these, also I have had the little plenum chamber on the front of the engine failed/cracked and leaking air.

The pipe work from this goes down to the second turbo and controls the TSOV.

Flack Thumbs Up  
Post #23939609th Jun 2025 10:03 am
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