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DIY: 2005 XC90 2.5T Spark Plugs using NGK Iridium BKR6EIX

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo XC90s. The XC90 proved to be very popular, and very good for Volvo's sales numbers, since its introduction in model year 2003 (North America).
cn90
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Year and Model: 2004 V70 2.5T
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Volvo Repair Database DIY: 2005 XC90 2.5T Spark Plugs using NGK Iridium BKR6EIX

Post by cn90 » Sat Jun 21, 2014 9:54 pm

DIY: 2005 XC90 2.5T Spark Plugs using NGK Iridium BKR6EIX

My “new” 2005 XC 2.5T with 82K still has factory spark plugs as the P.O. never replaced them. Since I have had good success with NGK Iridium BKR6EIX in my 1998 BMW 528i, I decided to use these NGK Iridium BKR6EIX spark plugs in my XC90.

To read about the antiseize debate, torque values, and how much torque needed to destroy the spark plug in a junk engine test etc., see the BMW threads below:

BMW E39 Spark Plugs thread (antiseize debate, torque values etc.):
http://www.bimmerfest.com/forums/showth ... p?t=533613

Antiseize debate thread:
http://www.bimmerfest.com/forums/showth ... p?t=405805


Parts/Tools:

- Local O"Reilly auto parts store sells NGK Iridium BKR6EIX for $7/each.

- Antiseize, Torque Wrench, Torx keys

- For spark plugs tool: I no longer use the socket with rubber insert (rubber falls off, spark plugs fall off etc. I got rid of this rubber-line socket): I use the magnetic spark plugs socket made by Gear Wrench (Advance Auto Parts sells it for $15: this tool is the ticket!

- I adjust the gap of all 5 spark plugs to 0.028” (factory is 0.030”). Just make sure you don’t touch the fine Iridium tip. Or you can leave it at 0.030".

- The Plastic Cover on top of the Valve Cover: once it is off, I recommend that you leave it off. Store the cosmetic cover (with the Torx bolts) in your garage. With the cosmetic cover off, it is much easier to change spark plugs, monitor oil leak from PCV hose and it is much easier to clean the Valve Cover area.

- The Timing Belt rear cover: you need to remove it to replace the the spark plugs. Once done, you need to re-install the TB cover to protect the TB from debris etc.


Procedure:

1. Get a box to keep nuts/bolts. For antiseize, apply the equivalent of “one drop of water”. Excessive antiseize can cause problem later.
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2. Turbo Hose:
- Use Torx #25 to remove the mounting bolts.
- You only need to disconnect the Turbo Hose near the firewall (7-mm socket to undo the clamp).
- No need to disconnect the Turbo Hose connection near the oil dipstick area.
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3. Torx #30 to remove the cosmetic cover and the TB cover.
XC90-Spplug-05.JPG
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4. Label the ignition coils 1, 2, 3, 4, 5 to avoid confusion.
- No need to disconnect the wiring from the ignition coil
- Simply lift the ignition coil (with the wring still attached) upward. You may have to rotate it first to break the bond between the boot and the spark plug.
- Ignition coil is held by a single 8-mm bolt.
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5. During installation:
- Turn the socket by hand (no ratchet) Counter-clockwise first to prevent cross-threading. Then thread it in by hand (no ratchet) until it rotates nicely. There is a debate about torque. I use the torque between 18-20 ft*lb.

6. See the factory spark plug at 82K miles, the gap has increased to 0.040”.

Car runs more smoothly with Iridium spark plugs. I will report on the fuel mileage later. Stay tuned.
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2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

cn90
Posts: 6436
Joined: Wed Mar 31, 2010 9:54 am
Year and Model: 2004 V70 2.5T
Location: Omaha NE
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cn90

Re: DIY: 2005 XC90 2.5T Spark Plugs using NGK Iridium BKR6EIX

Post by cn90 » Fri Apr 05, 2019 8:24 pm

Five-year report.

The Iridium spark plugs are great. I replaced them at 82K.
The 2005 XC90 2.5T is now at 120K.
Engine runs perfectly...
These users thanked the author cn90 for the post:
matthew1


2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

cn90
Posts: 6436
Joined: Wed Mar 31, 2010 9:54 am
Year and Model: 2004 V70 2.5T
Location: Omaha NE
Has thanked: 0
Been thanked: 79 times
United States of America
cn90

Re: DIY: 2005 XC90 2.5T Spark Plugs using NGK Iridium BKR6EIX

Post by cn90 » Sat May 04, 2019 7:48 pm

A little update on spark plugs in a 2004 V70 2.5T...

- NO need to remove the plastic turbo pipe. You can work around it.

- NO need to disconnect any wiring to the coil.

- Just use the Gearwrench magnetic spark plug socket and you are good to go.


2004 V70 2.5T 100K+
2005 XC90 2.5T 110K+

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