rear spark plugs on zt-t 2.5 v6 160 - Page 2

Gazmo65 · 19th June 2012, 07:15

Earlier v6 engines had 3 coils with leads at the front and coil packs at the rear, front plugs are easy to change as you already have done the rears are held in place by a small bolt or two, when removed the coil pack can be pulled up and off, the spark plug is then buried below this and is a real so and so to get to but can be done,remove the small bulkhead panel dont remove the manifold this makes it more involved,make sure you put a very small amount of copper grease on the threads of the new plugs as it makes it easier to take them out when you want to change them again.Whilst you are at it pull back the black rubber sleeve that is on the connection to the coil pack and check the insulation of the wire for about 3 inches from the electrical plug as you sometimes get rubbing and chaffing causing a misfire, people put down to damp or spark plugs.

kmtranter · 19th June 2012, 19:17

Bit the bullet and finally changed the rear plugs, didn't remove the manifold in the end. The hardest bit I found was finding the bolts holding the coil packs in place and effectively working by feel only. I dread to think the last time the plugs had been changed as the electrodes had been really worn down. Misfire now gone and the engine management light has gone out, but best of all a smile on my face as I my car now feels better than when I brought it last year, and the £150 I saved by doing the job myself.

Jim Jamieson · 19th June 2012, 21:22

Good on you Kevin

I changed mine a couple of months back and yes they are tricky to get at the rear.
I'm six foot plus and reaching over the engine my feet slipped a couple of times resulting in me getting rather physical with the top of the engine.
For shorter guys it must be a nightmare unless you actually sit up on top of the engine.

By the way I found an immediate result in the fuel consumption, it improved by about 2mpg.

JYJ

lovema75 · 19th June 2012, 21:56

Mine also had not been done since the year dot, sure my fuel consumption has got better!

19th June 2012, 07:15	#11
Gazmo65 Loves to post Volvo S80 Join Date: Feb 2010 Location: Burton Latimer Posts: 268 Thanks: 11 Thanked 39 Times in 20 Posts	Earlier v6 engines had 3 coils with leads at the front and coil packs at the rear, front plugs are easy to change as you already have done the rears are held in place by a small bolt or two, when removed the coil pack can be pulled up and off, the spark plug is then buried below this and is a real so and so to get to but can be done,remove the small bulkhead panel dont remove the manifold this makes it more involved,make sure you put a very small amount of copper grease on the threads of the new plugs as it makes it easier to take them out when you want to change them again.Whilst you are at it pull back the black rubber sleeve that is on the connection to the coil pack and check the insulation of the wire for about 3 inches from the electrical plug as you sometimes get rubbing and chaffing causing a misfire, people put down to damp or spark plugs.

19th June 2012, 19:17	#12
kmtranter Avid contributor MG ZT-T Join Date: Jun 2011 Location: earl shilton Posts: 230 Thanks: 4 Thanked 12 Times in 11 Posts	Bit the bullet and finally changed the rear plugs, didn't remove the manifold in the end. The hardest bit I found was finding the bolts holding the coil packs in place and effectively working by feel only. I dread to think the last time the plugs had been changed as the electrodes had been really worn down. Misfire now gone and the engine management light has gone out, but best of all a smile on my face as I my car now feels better than when I brought it last year, and the £150 I saved by doing the job myself.

19th June 2012, 21:22	#13
Jim Jamieson This is my second home Rover less ! Join Date: Jun 2011 Location: Tarbolton Posts: 3,442 Thanks: 393 Thanked 888 Times in 542 Posts	Good on you Kevin I changed mine a couple of months back and yes they are tricky to get at the rear. I'm six foot plus and reaching over the engine my feet slipped a couple of times resulting in me getting rather physical with the top of the engine. For shorter guys it must be a nightmare unless you actually sit up on top of the engine. By the way I found an immediate result in the fuel consumption, it improved by about 2mpg. JYJ

19th June 2012, 21:56	#14
lovema75 This is my second home 75 Tourer CDT Join Date: Dec 2011 Location: Enfield Posts: 3,925 Thanks: 63 Thanked 431 Times in 237 Posts	Mine also had not been done since the year dot, sure my fuel consumption has got better!