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Old 07-09-2011, 11:04 AM   #1 (permalink)
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Default 2004 Outback H6 3.0 VDC replacing spark plugs.

Hello, I am brand new to this site, have questions about replacing spark plugs on my 2004 Subaru Outback H6 3.0 VDC. What are the best plugs to use on the Outback? What gap does the plugs need to be during installment? Last question, How should I approach during replacement and installation, from the bottom or from the top? I just want to know what's the easiest route without the headaches that's all.

Thank you MUCH and Cheers!
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Old 07-09-2011, 11:17 AM   #2 (permalink)
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Try this, you will have to sign up but the site a wealth of info.

http://www.scoobymods.com/spark-plug...6-6-t4142.html
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Old 07-09-2011, 11:20 AM   #3 (permalink)
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NGK plug. Gap is .44 I believe. From under is best for most people.

Links here:
http://www.scoobymods.com/spark-plug...6-6-t4142.html
http://www.scoobymods.com/spark-plug...al-t12294.html

Also, moved to correct forum.
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2003 Outback: "Kaylee". 142,000 and counting.
Basics: Quaker State Ultimate Durability 5W30+MOS2, PureOne oil filter, Purolater air filter, Valvoline Maxlife Dex/Merc ATF, Mobil 1 75W90, Michelin Primacy MXV4.
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Old 07-09-2011, 11:20 AM   #4 (permalink)
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NGK plug. Gap is .44 I believe. From under is best for most people.

Links here:
http://www.scoobymods.com/spark-plug...6-6-t4142.html
http://www.scoobymods.com/spark-plug...al-t12294.html

Also, moved to correct forum.
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2003 Outback: "Kaylee". 142,000 and counting.
Basics: Quaker State Ultimate Durability 5W30+MOS2, PureOne oil filter, Purolater air filter, Valvoline Maxlife Dex/Merc ATF, Mobil 1 75W90, Michelin Primacy MXV4.
Mods: Fumoto oil drain valve, 2004 Forester XT shifter, HIR1 Phillips 9011 high beam upgrade, Nokya Hyper Yellow 9006 fogs.

Also: More rust and parking lot scars than I care to think about.
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Old 07-09-2011, 01:34 PM   #5 (permalink)
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The H6 specifies the NGK platinum plugs. Expensive, but I wouldn't mess around with anything else. Seems any time I've tried a non-spec plug I get misfires.

I replaced my plugs when I had the engine out of the car, so I'll be interested to hear how it goes for you. For the rearmost plugs, you may have to disconnect the engine mounts, jack up the engine, and shift it sideways. There's hardly any clearance back there.
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Old 07-09-2011, 04:01 PM   #6 (permalink)
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I do pretty much all my own work.

I gladly shelled out 250 or so to have the dealer do it.

Dave
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Old 07-10-2011, 08:14 AM   #7 (permalink)
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Thank you all for the advise. This is my first Subie, and more to come. I have one more thing to ask, when pushing the button to turn off the VDC the lights come on right, to tell you that the VDC is off but, when driving the VDC light goes off is there something wrong with the computer? Or is that an automatic feature in the car?

Thank you much again and CHEERS!
dmperry
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Old 07-10-2011, 02:24 PM   #8 (permalink)
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At some speed the VDC turns back on.

Dave
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Old 07-10-2011, 02:40 PM   #9 (permalink)
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Quote:
Originally Posted by CNY_Dave View Post
I do pretty much all my own work.

I gladly shelled out 250 or so to have the dealer do it.

Dave
I'm inclined to do the same when the time comes. Reluctantly though. Maybe I'm too cynical, but sometimes I wonder if they only do 4 or 5 out of 6 because it's a PITA for them too.
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Old 07-10-2011, 10:26 PM   #10 (permalink)
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Quote:
Originally Posted by Dmperry1974 View Post
Hello, I am brand new to this site, have questions about replacing spark plugs on my 2004 Subaru Outback H6 3.0 VDC. What are the best plugs to use on the Outback? What gap does the plugs need to be during installment? Last question, How should I approach during replacement and installation, from the bottom or from the top?
I did the plugs on my 2001 H6 about 40K miles ago. Should be the same as your 2004.

I did them from above. It was unexpectedly painful...but still, totally doable as an amateur/DIY job IF you have enough patience and the right set of tools.

Read these threads for details & tips:

Spark Plug H6 03 model
Flexible Spark Plug Remover/Installer
Spark Plug change, what a pig of a job!!!!!.

I've seen posts from a few folks here who suggest changing the plugs from below. I can't remember if any of them had an H6, but a 2-3 oil changes ago, I took a close look and it does look like the plugs might be easier from below. The rearmost plugs will be a pain no matter how you approach them. But next time, I'm going to try going from below first and see how that works.

Have fun!


-Jeff

p.s. As mentioned above, the manual specifies NGK platinum plugs. They come pre-gapped and in protective packaging. Attempting to gap them yourself may damage the platinum plating.
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