2008 LR2 Spark Plug Gap?
 

I got these Champion plugs from Atlantic British: Spark Plug (LR005483 Same Fit As Part # LR005483 ) - Land Rover ignition from Atlantic British

The OEM plugs are a different design, not gappable. Any idea what gap the Champions should have? They came with a gap between .035 and .040.

Also...both outboard plugs are blacker than the four inboard plugs, they also appear a bit wet and smell like fuel. Anybody seen this before? I'm hoping residual fuel, not oil.

Spark Plug Gap
 

For the NGK plugs ILRF6B

Gap to .75 mm (about 0.030")

EDIT: I took this information from the workshop manual but I don't believe that it matches how the engine was actually built, I believe that the stock sparkplug gap should be a lot larger than .030"

Note: I installed the plugs shown below (2.5 years ago at 50,000 miles)

6x 5344 Denso Iridium Spark Plug. Part # IKH20


I didn't adjust the gap

Edit: The Gap for the 5344 is .044" from Denso

And I am very happy with these plugs


All of my old plugs looked good (none were wet)


Good luck

Paul

2008 LR2 3.2 SE

Atlantic British was closed for the weekend when I posted but once I got hold of them they confirmed that the plugs did come pre-gapped.

Update... time for new plugs again. I used Denso 4704TT this time, noticeable increase in power due to the twin tips. Thanks again Paul.


More details on the Brit forum...

https://www.freel2.com/forum/post404393.html#404393

I just took notice of this comment from your last plug change years ago. My plugs came out the same way ... #1 and #6 in poorer condition that the others. I thought it was a random thing until now. Interesting. Glad that I saved a photo!

https://cimg5.ibsrv.net/gimg/landrov...dfb351f7bb.jpg

Yup. Guess it must be an LR2 thing.

Er, actually a volvo thing.

On further reflection and research, those plugs with the oily electrodes and threads are probably a symptom of leaking valve stem seals on cyls 1 and 6. Valve seals haven't been discussed much on this LR forum, but they are mentioned more in the Volvo forums for the same engine.

Ideally, the valve seals would be replaced if you notice oily plugs, and you have normal compression (to eliminate faulty piston rings as the source of the oil). But it's a big job.

Hmm. My #6 was a bit lower on both wet and dry compression, but #1 was in line with all of the others. All still well in spec at 150K.

The #1 and 6 plugs have consistently looked darker since I first checked them at about 60K.

Probably not worth the effort at this point.

I used to get a cyl 6 misfire on a cold morning start (colder than 55F) that resolved itself right after the engine warmed up. Only happened during the winter months.

How cold are the mornings where you live?

SOCAL, not much colder than 40*F, and that rarely.

We do winter trips in the Sierras, not much colder than 20*F. Never had misfires.