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Jimmi
Member Since: 11 Oct 2020
Location: Rickmansworth
Posts: 48
 
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Hi I have a discovery 3 V8 and while it’s ticking over the engine is lumpy and what I would describe as juddery. I called the AA and typically it didn’t do it while they were looking at it. But he plugged into the diagnostic machine and nothing came up. Does anyone know what this could be? It’s booked in for a service next week, but I’m worried it might be something serious. Any advice will be greatly appreciated
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 10th Feb 2022 3:26 pm |
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pjm-84
Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2460
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Throttle body? Air filter?
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| 10th Feb 2022 3:41 pm |
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aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459
 
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On the diesel engine it can be caused by an oil temp sensor Andrew
D3 2.7tdv6 2005
D4 3.0 SDV6 Commercial died and gone to LR heaven
D5 3.0 SDV6 HSE
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| 10th Feb 2022 7:38 pm |
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Yankee_Rover
Member Since: 02 Jun 2021
Location: Seattle
Posts: 183
  
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Dirty throttle body, MAF sensor, and MAP sensor are all potential causes of rough idle in the 4.4L V8 just like our TDV6 friends. Likewise, we have an EGR system so it’s possible the EGR valve could use a cleaning too! The TB and MAF are easy to access and clean so start there. MAP sensor on the V8 is in the rear (toward bulkhead) and supposed to be a bit challenging to access.
I’ve got this on my list of spring maintenance chores. 2008 LR3 HSE, 4.4L V8
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| 10th Feb 2022 8:23 pm |
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kajtzu
Member Since: 11 Aug 2017
Location: Helsinki
Posts: 6583
 
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Very funky errors are also introduced by PCV valve being all gunked up. Granted, I’ve never seen this happen personally but urban legends tell of engines with weird codes that magically themselves after the PCV saucer was changed.
I would also guess on throttle body being dirty.
Not sure about the MAF, mine seems to always be clean and I’ve never done anything to it. Perhaps my air filters are great but I doubt it. People using reusable filters (K&N in particular…..) seem to have it full of oil or something silly.
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| 10th Feb 2022 9:59 pm |
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Trollman
Member Since: 09 May 2017
Location: Swindon, Wiltshire
Posts: 147
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check its not misfiring, I had no errors on the IID Tool, but when I looked at live data I had various misfires. New coil packs sorted it. *D3 V8 SE Blue 2004 on LPG with Rock sliders, roof rack/Ladder, snorkel, 275/65x18 STT Muds, engine/G/box ally protection.
*D2 TD5 Epson Green 2002 Off roader (weekend toy)
*D3 V8 HSE silver 2004 on LPG (Wife's) SOLD
*Maserati Gran Turismo, the Gentlemans cruiser with a V8 soundtrack.
Youtube/trollmanRS
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| 12th Feb 2022 4:08 pm |
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