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Knightrider



Member Since: 22 Mar 2014
Location: England
Posts: 125
United Kingdom 2004 Range Rover Vogue 4.4 V8 Java Black
Strange issue-tapping/knocking sound on lpg,silent on petrol

Hope someone can shed light on why my car has a tapping/knocking sound from the engine when running on petrol but as soon as I flip to petrol the knocking disappears?

It's done this for years, I always thought it was the vanos but discovered by chance it's down to the lpg. Does anyone know where on the lpg system I should be looking to fix this? I have a Romano premium system 2004 Range Rover Vogue 4.4 v8 LPG, Java Black, 22' Hawke Alloys, Black Beast
Post #474001 27th Mar 2018 1:05am
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cass



Member Since: 12 Oct 2011
Location: northumberland
Posts: 734
United Kingdom 

Probably LPG injectors, most of them have O rings in that wear or flatten over time.
If yours has always done it then it may just be that your type are noisy
Post #474003 27th Mar 2018 2:49am
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bob-lad



Member Since: 12 Jun 2015
Location: Herefordshire
Posts: 91
United Kingdom 2010 Range Rover Autobiography 5.0 SC V8 Santorini Black

What does your LPG tech say when you get the LPG system serviced annually?
Post #474034 27th Mar 2018 11:04am
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Knightrider



Member Since: 22 Mar 2014
Location: England
Posts: 125
United Kingdom 2004 Range Rover Vogue 4.4 V8 Java Black

cass wrote:
Probably LPG injectors, most of them have O rings in that wear or flatten over time.
If yours has always done it then it may just be that your type are noisy


I don't get the LPG serviced annually, I change the gas phase filter myself every 10k miles. Further to that as long as the system is working and there are no leaks I don't mess with it 2004 Range Rover Vogue 4.4 v8 LPG, Java Black, 22' Hawke Alloys, Black Beast
Post #474091 27th Mar 2018 8:24pm
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