So , having my car only a few weeks, and not having a full overview of its service history ( though good it seems) it was due the plug change, and this time with the 'big service' the coil packs to , so new NGK units purchased, and genuine plugs from Bentley them selves i set to with a new inlet manifold gasket , this was more future proof preventative maintenance, rather than issue fire fighting problems.

having removed the 'top' this is after the new plugs and coil packs have been fitted, not too bad for 100k mile engine on a 2007 GT , masking tape used to prevent debris falling into the intake chambers ,



underside of the intake manifold for reference, old gasket did seem to let some oily residue past, new one will sort that on refitting , previous works had resulted in some small marks to the face, none that really impact the fitting , more noticeable in the pics rather than deep,


12 old coils and plugs, generally looking good with about the right amount of miles, and perfect for replacement, no major fouling or issues to the electrode ends, coil packs were gently prised up using a plastic hooked back trim removal plastic tool you find in all the trim clip tool kits,



now i have also replaced an intermittent and iffy MAF sensor the engine starts from cold with ease and settles right down after the initial ignition phases , and sits at 500-550 RPM at idle ,


all back together and a few miles under her belt now, running very nicely indeed




one bit at a time......
BB

 

Very nice set of pics, thanks!

 

Nice job!

While you were in there were you able to see the intake valves?

I’ve been wondering if these W12s have the same carbon buildup issues as the other VAG FSI products that are plagued with this problem and need an occasional walnut media blast and/or chemical treatment to clean off the buildup.

 

Nice job @BrakeBuster !!
Rep added.


Hello @sam08861 ,
Our W12's are not FSI, which is also known as direct fuel injection, meaning, FSI injects the fuel directly into the cylinder chamber at very high pressure, 500PSI to 1800PSI IIRC, whereas what we have on our first Gen and the second Gen W12's up to the 2014/2015 MY year engines I have had and worked on, they have port fuel injection, where the fuel is injected into the intake runners on each cylinder head, and these runners spray the fuel on top of the intake valves, therefore there is no carbon buildup.

Johnny

 

That’s a relief. Faulty assumption on my part.