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Rough idle D4
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HowardO
 


Member Since: 23 Jan 2012
Location: Trondheim
Posts: 29

Norway 2010 Discovery 4 3.0 TDV6 HSE Auto Java BlackDiscovery 4
Rough idle D4

Hi
Anyone had problems with the idle occasionally starting to get rough and the whole car shivers? As if some of the cylinders lay off..? At normal driving the car is fine.
I hooked up the iidtool and as far as i can see everything is normal, no faults or nothing. The only thing i can see is that the idle RPM goes from 740-650..

This seems to happen only with warm engine.
Short video of the event...



Howard  
Post #146351124th Apr 2015 10:32 pm
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bigjl
 


Member Since: 22 Aug 2014
Location: Essex
Posts: 59

United Kingdom 

My Jaguar used to idle roughly on occasion.

Whole car used to shudder.

It would also hesitate when pulling away.

Jag could find nothing when under warranty.

I though I would clean the MAF sensors.

Found one to have contamination of some kind, like small bits of grit that you couldn't remove.

Changed both sensors and car now no longer hesitates and splutters when pulling away and the rough idle has never returned.  
Post #147838625th May 2015 12:29 pm
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Fault codes and live sensor data is required as there are a number of things that could cause this.

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Post #147842625th May 2015 2:16 pm
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bigjl
 


Member Since: 22 Aug 2014
Location: Essex
Posts: 59

United Kingdom 

My car never showed any fault codes.  
Post #147846825th May 2015 3:42 pm
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