GS450h spark plugs change

[Hybrid_power]

Hi everyone, like in the topic above, I need to change spark plugs in my Gs, thinking to do it by myself to save on Labour. Lexus main dealer price is 650 £!

Genuine Parts cost (DENSO) is only 140£ ! How hard it is to do it ? Do you guys have any advise for me please ? 

[Gew]

Found an old thread on the given task.

https://www.lexusownersclub.co.uk/forum/topic/113558-gs-450h-spark-plug-change/

Seems he (or she) found it to be somewhat troublesome. Let's face it, almost all Toyota engines with V-configuration heads will give you a PITA with the plugs on the "buried" bank.

I myself don't own a GS, but an old RX with the 1MZ engine. The rear three plugs is a nightmare.

[scudney]

Apparently the front ones are easy to do,the problem is with the rear ones especially with the lack of space/room 🙁

[Hybrid_power]

I've wached some videos on YouTube and I know to change passenger side I need to take off air intake. Does any of you tried to do it ? I'm planing to buy torque wrench and spark plugs tool. I will try to do some tutorial with pictures if successful. 

[Farqui]

The central inlet plenum is quite fiddly to remove with a couple of awkward bolts on the back of the throttle body.

You will also need a long reach allen bolt to get the plastic inlet off (preferably on a wrench as mine were too tight for an allen key to loosen). 

I thought that I'd got all the buried bolts out but still kept finding another nestled down in the plastic #peskything

The plenum gasket is rubber and I reused mine without reporting any obvious air leaks. 

I've since sourced a replacement (Rockauto) and will probably fit that soon as I'm testing my VVT oil control valves (that also need the central/top plastic gubbins removed).

The passenger bank also has a wiring loom running over the top of the coils, so unbolt it and ease it out of the way.  I think it's tight on the rear most, passenger coil/plug.

As ours use coil on plug, then pop a drop of dielectric grease on the top of each plug.

Good luck and let us know how you get on.