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Restricted performance MAF?
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4
Restricted performance MAF?

Our Easter few days away got ruined yesterday. Towing the tin tent on the way to Chester on the M62 we got the dreaded restricted performance message on the dash. Managed to get it to Hartshead Moor services and Mayday (Green flag) said the codes pointed to the Mass Air Flow sensor. We ended up on the flat bed taxi home and now I’m waiting for it to be picked up and dropped off at the dealer.

I’m hoping the repair bill won’t be too bad but I haven’t heard of many cheap repair bills so perhaps I should prepare for the worst.

It’s the best car I’ve ever owned so I don’t want to lose confidence in it. 50k miles and it’s only let me down twice so I’m trying to look on the bright side and keep things in perspective. Just need someone to say it’ll be ok and I should keep the faith! 😔
 Bri

D4 HSE Luxury 
 
Post #19329763rd Apr 2018 2:50 pm
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10463

United Kingdom 2016 Discovery 4 3.0 SDV6 Landmark LE Auto Waitomo GreyDiscovery 4

It might be worth cleaning the MAF sensor before incurring expense. Here's how, courtesy of DSL Thumbs Up :-

https://www.disco3.co.uk/forum/topic63478-45.html

NJSS
 Am I Gammon or Woke ? - I neither know nor care.

2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t. 
 
Post #19329793rd Apr 2018 2:59 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

Thanks NJSS

The thread confused me because it talks about MAP sensors but I'm sure the guy yesterday said MAF. I could be wrong though.

Just been out and cleaned it though. I didn't clean inside the hole but it was a bit oily. Fired her back up and still got the same message. I can't reset the fault codes though. Would I need to do that before the car thought it was fixed?

Thanks for the suggestion! Bow down
 Bri

D4 HSE Luxury 
 
Post #19329843rd Apr 2018 3:29 pm
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adam
 


Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917

United Kingdom 

Don't stick anything down the little hole in the sensor - expensive mistake (from personal experience)

edit - beat me to it

Could be a multitude of sins - good luck in getting it sorted
 

Last edited by adam on 3rd Apr 2018 3:35 pm. Edited 1 time in total 
Post #19329873rd Apr 2018 3:31 pm
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Sheepy
 


Member Since: 20 Feb 2013
Location: Bedfordshire
Posts: 630

United Kingdom 2010 Discovery 4 3.0 TDV6 GS Auto Zermatt SilverDiscovery 4

Check for a split in the hose from the MAF.

Do you get restricted performance message or just the engine-check light on?

And does the performance actually get restricted - ie does the car go into limp mode as soon as you drive, or after you hit about 2k rpm / 55mph?
  
Post #19329893rd Apr 2018 3:34 pm
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DiscoJeffster
 


Member Since: 27 Feb 2016
Location: Perth
Posts: 204

Australia 2010 Discovery 4 3.0 TDV6 HSE Auto Nara BronzeDiscovery 4

Can you get us the exact fault codes to help diagnose? It’s probably an air leak and you got an algorithmic error (air measured at the MAF doesn’t correspond to the MAP sensor reading) - e.g. not enough boost for the air taken in through the MAF hence it must be escaping. I’ve had a few of those with various faults to blame.
  
Post #19329953rd Apr 2018 3:45 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

Thanks for the replies gents. It’s gone to the dealers now so I can’t check anything else. They said they’ll get the fault codes read tomorrow and let me know what they think.

The lights that are illuminated are yellow engine management and red triangle with exclamation. The message centre reads restricted performance as soon as the engine starts. Actual performance is definitely restricted. 😔
 Bri

D4 HSE Luxury 
 
Post #19330603rd Apr 2018 5:38 pm
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adam
 


Member Since: 20 Sep 2005
Location: Home and Happy
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Sounds like mine - traced back to a faulty TSOV and subsequently a leak in the intake piping - good luck
  
Post #19330613rd Apr 2018 5:40 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

Sorry for being thick but what is TSOV? And is it expensive? 😭
 Bri

D4 HSE Luxury 
 
Post #19330773rd Apr 2018 6:10 pm
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adam
 


Member Since: 20 Sep 2005
Location: Home and Happy
Posts: 6917

United Kingdom 

No need to apologise - the little I know on these cars comes from far more learned folk than me on this site - TSOV = Turbo Shut Off Valve, cost about £500 fitted - made a sound like a cat in pain when it failed
Could be something as simple and cheap as a leaky seal in the air intake system, lose or damaged pipe etc. - let’s us know what the problem is when you get it looked at
  
Post #19331183rd Apr 2018 8:10 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

The garage has just called. They think it is a faulty MAF sensor. They've ordered one for tomorrow and hopefully that'll sort it out. I've got my fingers crossed!
 Bri

D4 HSE Luxury 
 
Post #19333974th Apr 2018 4:16 pm
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90dv
 


Member Since: 19 Nov 2006
Location: Cumbria
Posts: 62

United Kingdom 

if it comes on at idle or just ignition on it will probably be the MAF sensor (detects amount of air going into engine)
 "OIL" - 1990 200tdi Defender 90  
Post #19334774th Apr 2018 7:39 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

Exactly that; the error message comes on as soon as the engine is started without touching the accelerator. Once it has completed the startup checks, up it pops.
 Bri

D4 HSE Luxury 
 
Post #19335144th Apr 2018 8:34 pm
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Barn1e
D3 Decade 


Member Since: 28 Aug 2006
Location: Mid-sussex
Posts: 2021

United Kingdom 2005 Discovery 3 TDV6 S Auto Tonga GreenDiscovery 3

Have a read through my thread from many years back. In the end it was the lack of power to the MAF caused by a missing fuse. How the car had run fine for so long I have no idea. Since posting that thread I have heard of two others with same fuse missing.

https://www.disco3.co.uk/forum/fault-codes...ht=Fuse+17
 2005, TDV6 S, Auto, 190k miles, owned from new, V8 Brake Upgrade, Nancom Evo, RLD protector, BAS EGR blanking & Remap, separate ATF cooler, changing all the fluids ahead of time.  
Post #19337095th Apr 2018 12:47 pm
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Clubber
 


Member Since: 11 Aug 2008
Location: Teesside
Posts: 372

United Kingdom 2014 Discovery 4 3.0 TDV6 HSE Lux Auto Loire BlueDiscovery 4

So, a new MAF sensor has cured the problem. I’m really grateful to Stratstone in Stockton, they diagnosed and resolved it quickly so i’m a happy bunny again!

The thought of needing to get a new car was weighing on my mind. I couldn’t think what I would replace a D4 with. Thankfully I get to enjoy mine a little longer! 👍
 Bri

D4 HSE Luxury 
 
Post #19340086th Apr 2018 12:08 pm
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