2004 disco se7 misfire on cylinder 6 - Land Rover Forums : Land Rover and Range Rover Forum
 
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post #1 of 6 (permalink) Old 06-03-2019, 05:09 AM Thread Starter
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2004 disco se7 misfire on cylinder 6

I've been starting to have a misfire on my 6th cylinder and just a couple months ago changed the head gaskets. I took out the spark plug and saw there was oil on it. Is there a common issue it comes from or is there many reasons oil is leaking in?
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post #2 of 6 (permalink) Old 06-03-2019, 06:11 AM
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Are you sure it’s oil??
Plug could be fouled for a number of reasons

When you had the heads off did you have them serviced?
check for warpage?
valves cleaned?
valve guides checked?
valve seals replaced?
Or just “head gaskets”?

Happy Happy Happy

2002 D2 se7 6 seater . complete engine rebuild with flanged liners , 2 inch lift, terrafirma shocks, LT 275/65r18 Cooper stt tires, d1 modified front bumper, safety devices rack, 30" l.e.d. Light bar
2004 D2 se5 (sold)
2001 D2 se5 (parts truck)
2000 D2 se7 (retired)
1997 D1 (sold)
1957 Series 1 88" future projet
2006 Suburu legacy outback (gets me around when the disco is not)
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post #3 of 6 (permalink) Old 06-03-2019, 06:39 AM Thread Starter
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It smelled, looked, and felt like oil but not 100% sure. I didnt have the heads serviced, just replaced all the gaskets to the parts removed to get to the heads.
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post #4 of 6 (permalink) Old 06-03-2019, 12:31 PM
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Do you have a picture of the bad plug?
Was it burnt oil or wet?

Happy Happy Happy

2002 D2 se7 6 seater . complete engine rebuild with flanged liners , 2 inch lift, terrafirma shocks, LT 275/65r18 Cooper stt tires, d1 modified front bumper, safety devices rack, 30" l.e.d. Light bar
2004 D2 se5 (sold)
2001 D2 se5 (parts truck)
2000 D2 se7 (retired)
1997 D1 (sold)
1957 Series 1 88" future projet
2006 Suburu legacy outback (gets me around when the disco is not)
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post #5 of 6 (permalink) Old 06-04-2019, 06:53 AM
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Quote:
Originally Posted by Bjorn2662 View Post
It smelled, looked, and felt like oil but not 100% sure. I didnt have the heads serviced, just replaced all the gaskets to the parts removed to get to the heads.
You should ALWAYS have the heads checked. They are aluminum and so is everything that touches them, so warpage can be a factor with a overheat. You very well may not have had a proper headgasket installation if this is the case. Nothing else really matters as far as diagnosing is concerned because you need to get those heads back off and have them sent to a shop and tested.

Rinse & Repeat HG Job... Sorry.

Michael
'01 LR Disco II SE7


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post #6 of 6 (permalink) Old 06-04-2019, 09:25 AM
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Agree; just assumed that you had the heads checked for warping. I had rebuilt heads installed on mine when I replaced the head gaskets. As I remember it was about $150 more per head.
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