Lighthouse · Feb 20, 2016

I have a 4.2sc and bought a new set of plugs as its running lean on gas sometimes.

I thought would be a quick easy job.

Removed the engine cover and I can't even see the plugs or HT leads.

Where are they?

Thanks from a stupid member

cooltide · Feb 20, 2016

Not having any experience with this engine, I'd guess the coil packs sit on top of the individual plugs so no HT leads

cooltide · Feb 20, 2016

An air leak would cause lean running or else faulty efi component, check all intake / VAC hoses are fitted and sound.

discool · Feb 20, 2016

In the same place as any other V8 I would think. If its anything like the XK8 engine, first the top cover then the covers over each bank to reveal the plugs and leads, of course there's also other stuff first to remove to give access. So a plug change takes me over an hour. The XK 8 has its coil packs together at the rear IIRC.

Lighthouse · Feb 20, 2016

cooltide said:
An air leak would cause lean running or else faulty efi component, check all intake / VAC hoses are fitted and sound.

Thanks will take a look around, it reports lean on both banks and after a reset goes anywhere between 50 and 150 miles before engine management light is back.

Lighthouse · Feb 20, 2016

discool said:
In the same place as any other V8 I would think. If its anything like the XK8 engine, first the top cover then the covers over each bank to reveal the plugs and leads, of course there's also other stuff first to remove to give access. So a plug change takes me over an hour. The XK 8 has its coil packs together at the rear IIRC.

Thanks had a quick look did see some plastic covers over the banks under the supercharge will investigate more

Allan_T · Feb 20, 2016

Coil over plug on the 4.2 SC

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