Key differences between the HR and DE are:
*Replacing the spark plugs on the HR is very difficult if not impossible to complete without removal of the intake manifold
*You'll need a 14mm spark plug socket to remove them

Tools required:
Socket wrench with 4"+ extension
10mm, 12mm, 14mm sockets
14mm spark plug socket
Flat head screw driver

Process breakdown:
1. Remove engine cover and intakes
2. Remove strut bar *14mm (this is 2nd because 1 nut is abstructed by intakes)
3. Remove vacume hoses along w/ small hoses filled with radiator fluid (I only came across 1 because I refused to remove all hoses)
4. Remove intake manifold or push out of the way*12mm
5. Remove coilpacks & Replace Sparkplugs *10mm & 14mm Sparkplug Socket
6. Stick it all back in a reverse order

Pics:
My process was a bit extensive due to having CAI.. I had to remove front bumper to get the upper tubes off with minimal damage.



There are 6 long bolts on the intake manifold and two nuts, one in at the front and the other in the rear. (12mm)




I didn't feel like removing all the hoses attached to the intake manifold so I lifted it as high as I could and held it up with a wrench.



Here are the coilpacks, each have a bolt that must be removed. (10mm)




(bonus pic) And this is how it looks like underneath the manifold.. I'm not sure if all that oil is normal, but it seems like it according to other threads on this forum..

 

Nice write up! This should be stickied!

 

^+1 when i hit 50k i will be looking for this

 

Plugs are supposed to be good till 100k, but anyway a catchcan should keep oil out of the intake.

 

bump for an awesome thread. i do have cold air intakes...but i wonder if you really do have to remove them along with the front bumper? i certainly hope not. guess i'll find out this friday when i install my replacement plugs...

 

You know you can replace them without removing the intake manifold.

 

man this is looking really difficult . . i dont wanna remove the manifold . . . . cant it be done with just removing the throttle bodies ? ? ?

 

Yes.

 

funny . . the service manual for HR says you just remove engine cover . . .


i think they just want to replace plugs 1 and 2 . . . there is no way you can get to the rest without removing the hoses and TB/intakes

 

Try swivel sockets.

 

really ? has anyone done it without removing the throttle bodies or manifold ?

also when reinstalling the throttle bodies, did you guys ado an IDLE AIR VOLUME LEARNING afterwards ? ? ?



plz help out a newb

 

Awesome write up!!! Sticky please!!!

Did you replace the Intake Manifold Gasket?

 

Don't waste your time removing the Intake Manifold . Doing plugs on an HR is cake.
Disconnect negative terminal-remove engine cover-unplug TBs-unbolt them and move them out of the way just enough so you can get to the back plugs

 

I was just at a dealer checking my car out. I asked the mechanic to take a plug out. He didn't seem to have a problem whats so ever Plug looked like new

 

The 4 up front are easy to get to its the rear two that have the TBs in the way , How's the Z running Andre?

 

Great, thanks. I just need to check my mph next time I go to the track. I'm not much into,, what's it called? "by the pants feel", something like that

 

the good ol butt dyno? lol , Im not into that either, Trap speed is my indicator of power

 

Im getting ready to do the plugs on my HR, seeings as some say it can be done without removing the TB, are there any write ups for this..?

 

Can someone confirm if these are the correct torque specs for the HR?

Spark plug - 14 ft lb
Throttle body - 75 ft lb ( in a X pattern)
Coil pack - 62 ft lb

 

No way those last 2 spec's are correct. Look again.