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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black
Engine misfire on idle 4.2

Hi - my 4.2 First Edition Sport is misfiring on idle - the spark plugs have just been changed and the diagnostics read out is displaying P0302 cylinder 2 misfire
P0303 cylinder 3 misfire
P0304 cylinder 4 misfire
P0308 cylinder 8 misfire

i have replaced all 8 spark plugs and coil packs of the cylinders that have registered a fault,

misfire is only really noticeable on idle, once a steady engine speed is held it runs much better

engine management light is not on at the moment

Post #392548 Fri Aug 23 2013 7:40am
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Ady 555
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Member Since: 12 Dec 2010
Location: Good old yorkshire
Posts: 8738

United Kingdom 2012 Range Rover Sport SDV6 HSE Santorini Black

Was this a problem before you changed the plugs Question

Post #392552 Fri Aug 23 2013 8:26am
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Yes - the engine management light was on too....but now off...

Post #392553 Fri Aug 23 2013 8:28am
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Would an engine ECU reflash /update help?

Post #392558 Fri Aug 23 2013 9:00am
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Ady 555
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Member Since: 12 Dec 2010
Location: Good old yorkshire
Posts: 8738

United Kingdom 2012 Range Rover Sport SDV6 HSE Santorini Black

Not sure an ecu reflash will help, that will clear any fault codes stored, but i'd check the maf sensor first.

Post #392782 Sat Aug 24 2013 8:49pm
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Ok thanks - will do

Post #392869 Mon Aug 26 2013 9:26pm
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Bobby



Member Since: 07 Jun 2005
Location: Kuala Lumpur
Posts: 3781

Malaysia 2006 Range Rover Sport Supercharged Chawton White

Generally, such misfires can also be classified as "random misfires".
And the possible causes would be:

* ECM to ignition coil primary circuit faults
* Ignition coil failure
* Spark plug failure/fouled /incorrect gap
* Fuel delivery pressure (low/high)
* Fuel injector circuit fault(s)
* Fuel injectors restricted/leaking
* Fuel injectors continuously open
* Fuel contamination
* Cylinder compression low
* Worn camshaft/broken valve springs
* Valve clearance adjustment

Use an approved diagnostic tool to do some coil tests, check the spark plug condition and gap, check the fuel pressure, check for fuel injector problems. Malaysia Boleh!
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Post #392894 Tue Aug 27 2013 9:16am
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Thanks - the spark plugs and coil packs have been changed a week ago by a senior BMW technician - he identified one of the old spark plugs was not in properly. The new ones are all in as they should be now.

Post #392900 Tue Aug 27 2013 10:32am
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Ady 555
Site Moderator


Member Since: 12 Dec 2010
Location: Good old yorkshire
Posts: 8738

United Kingdom 2012 Range Rover Sport SDV6 HSE Santorini Black

Never trust a BMW technician... Next he will be telling you to trade in your sport for an X5 Whistle Are you sure he hasn't sabotaged your sport just for this reason Question Laughing

Post #392910 Tue Aug 27 2013 11:41am
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Lol - I hope not - we both work at the same diagnostics company....

Post #392913 Tue Aug 27 2013 11:48am
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Edwards1987



Member Since: 12 Sep 2013
Location: Surrey
Posts: 1

England 2006 Range Rover Sport Supercharged HST Zambezi Silver

Hi guys

Did you manage to cure this problem as I have the same problem with my 2006 4.2 sport. Mine is misfiring on cylinders 3 and 5,the misfire clears after 1000 rpm. any advice would be very grateful

Post #394810 Thu Sep 12 2013 6:59pm
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

The misfire is still there on all eight cylinders - more noticeable on start up - but then subsides as the engine warms up.

Overall it drives nice and smooth but it's still very annoying that the misfire exists - after all the diagnosing and money spent.

Post #428074 Mon Jun 23 2014 11:57am
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vnitos



Member Since: 03 Nov 2010
Location: pretoria
Posts: 31

South Africa 

Mine does exactly the same - misfire on startup and idle - and engine management light comes on and stays in until reset. Dealer found a bit of oil in one of the spark plugs, which they dried and apparently its better now. I told them to keep the car until they 100% sure that the issue has been resolved.

Post #431490 Thu Jul 24 2014 2:50pm
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DC_Supercharged



Member Since: 14 Aug 2013
Location: Warwickshire
Posts: 27

United Kingdom 2005 Range Rover Sport Supercharged Java Black

Let me know when you get it back and if the dealer did any more work to rectify...

Cheers

DC

Post #431491 Thu Jul 24 2014 2:53pm
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vnitos



Member Since: 03 Nov 2010
Location: pretoria
Posts: 31

South Africa 

will do

Post #431493 Thu Jul 24 2014 3:08pm
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