Hi all, I am after new spark plugs and HT leads for my 2006 RRS Supercharged
Could any one tell me the best ones to buy please.
I have a very slight miss fire on tick over.  2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

Didn't think they had HT leads? Coils straight onto plugs.

jag engines are quite fussy, so probably need to stick to NGK.

See ebay, and you should get some change out of £100


Could be a faulty coil. Any fault codes reported for misfire on Bank x ?

thanks Andy I am a head don't know why I typed HT leads

just standard NGK's or NGK IRIDIUM ? 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

2006 Supercharged Engine Ignition

Click image to enlarge

90% certain the slight miss fire (more of an engine stumble, can't be heard but you feel the shudder through the steering wheel etc?) will be the injectors need cleaning.

Next job on my list.

EDIT; Oh you need the Iridium plugs (they're good for 100k miles before they need changing.. usually!)

I to have this stumble is a tin of injector cleaner enough or does it take more as it's only on tick over everything else is ok

It's worth trying a can or two of BG44 to see if that helps, getting the injectors out is quite a big job.

I've been told to increase the plug gap on my Jag from 1.0 to 1.3mm (probably go for somewhere in between) to make it idle better.

Have you changed the plug gaps on your Jag ?

I'm guessing this will be a cheaper and quicker fix than cleaning the injectors. That being said doing both can only be a good thing.

I'll dig out the feeler gauges this weekend and see if it makes a difference. Thanks for the tip

Not yet. Hopefully I'm gonna try and measure the gap at the weekend, but won't drive for a while

Andy K wrote:

I've been told to increase the plug gap on my Jag from 1.0 to 1.3mm (probably go for somewhere in between) to make it idle better.

I had a look after you mentioned it and as you say the default plug gap on the 4.2SC is between 0.9 and 1.0 mm.

I've not had chance yet but I was going to set mine to 1.2, but as I said, I think this is a temporary fix rather than cleaning the injectors.

I have ordered a can of BG44 let se if t makes a differents! 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE

my jag Iridium's were at 0.9mm so moved them to 1.1mm

any change? 2006 RR Sport Supercharged Love this car
2009 BMW 335D GONE
2008 VW R32 GONE
1999 RR SE GONE
1994 RR HSE GONE
2001 VW V5 GONE