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Spark plugs
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Steve17
 


Member Since: 08 May 2016
Location: Essex
Posts: 422

England 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3
Spark plugs

Evening all I have a 4.4 v8 that is gas converted it has a lovato fast fit system the other month I fitted ngk plugs from Euro Car Parts but now the car has a slight misfire and pings up the engine management light saying system to lean but it never done this before changing the plugs so what I need to know really is do I get some genuine plugs from dan or do I fit the ngk laser lpg plugs cheers Steve  
Post #20667167th Jul 2019 7:49 pm
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Narpy
 


Member Since: 18 Jul 2011
Location: Stockport
Posts: 7830

2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Maybe only one of your plugs is duff and not fully sparking which in turn would ping up the too lean warning. Wink
Oh yeah, it's too lean by the way. The way you've written it means it's about to fall over. Laughing

I would personally buy one plug, and change it for each one in turn until the problem went away. Wink
Saves throwing away 7 perfectly serviceable spark plugs Wink Mods:
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I'm not scared, I'm outta here.  
Post #20667177th Jul 2019 7:55 pm
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Globetrotter448
 


Member Since: 21 Mar 2017
Location: Londonderry NSW
Posts: 1782

Australia 2007 Discovery 3 4.0 V6 Petrol SE Auto Java BlackDiscovery 3

Pull one lead at a time and see if there is any difference to the running of the engine Embarassed  
Post #20668158th Jul 2019 10:16 am
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Bungle
 


Member Since: 07 Apr 2015
Location: Wanborough
Posts: 254

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Cairns BlueDiscovery 3

So first things first, you made two changes, fitting a gas conversion system and fitting new plugs. It would be unusual for new plugs to throw a running too lean code, I think that is a red herring.

Do you get the same problem running on petrol as well as LPG? If so then I suspect when you fitted the gas injection system into the manifold you ended up with an air leak into the manifold somewhere. If you only get the error when running on LPG then I would be looking at the calibration of the gas system (not familiar with your specific make so not idea how you do that bit).  
Post #20668198th Jul 2019 10:31 am
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