Daz8
Member Since: 11 Oct 2012
Location: Perthshire
Posts: 1
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| 2012 5.0 V8 Feels like missfire |
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We have a 2012 V8, Had chains. tensioners, plugs, heads etc. done 5K miles ago and been going great. yesterday it felt like miss-firing, then engine management light and restricted performance light after 20 miles or so. Limped it home, checked with GAP IID tool and no codes stored, water level and oil level all good. The miss-fire gets progressively worse as you drive it now.
Any ideas?
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 8th Sep 2024 12:00 am |
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G3Z
Member Since: 16 Dec 2018
Location: South Wales
Posts: 558
  
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Have you put fuel in at your regular place? Or have you used a different fuel station?
Have you checks the spark plugs? Defender 110 2.4 TDCi Utility Station Wagon.
2007 Disco 3 GS TDV6 Manual
200,000+ mile club 😎
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| 8th Sep 2024 12:32 am |
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KPTV8
Member Since: 05 Feb 2012
Location: Itinerant !! (Scotland/Donegal)
Posts: 186
  
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Interesting !
My 5.0 V8 D4 recently ran poorly for a couple of weeks :-
- OK at steady road speeds
- Lumpy torque at low revs
- Clunky gear changes (ZF 6-speed box)
- Rich-smelling exhaust and SLIGHTLY increased fuel consumption
MDRS Workshops in Consett made a big and immediate improvement by replacing both MAF sensors. Awesome guys working there !!
I'm left with an MOT emissions failure (excessive CO exhaust at 2nd idle) still to be corrected, but the car is driving perfectly now.
As of now, havn't worked out what has caused the above symptoms in the first place - i.e. why did BOTH MAF sensors fail simultaneously ?
Regret to say I didn't record any codes  ((
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| 8th Sep 2024 7:15 am |
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kajtzu
Member Since: 10 Aug 2017
Location: Helsinki
Posts: 6748
 
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This is not a very scientific answer but MAF sensors can (do) get old and less sensitive. Some might call it laziness. They can get dirty, too, and there are sprays that attempt to clean them. They don’t do miracles however. When that happens the amount of airflow it measures doesn’t update quickly enough, the computer controlling the engine believes that and attempts to compensate in various ways.
I had something very similar on my D3 V8 and fuel consumption went down over 3 liters/100 km just by switching from the original MAF sensor to a brand new Denso one. I had had lean conditions that vanished after that.
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| 8th Sep 2024 8:28 am |
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