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Old 04-04-2008, 03:44 PM   #1
Scooby Newbie
Member#: 176563
Join Date: Apr 2008
Default 2003 impreza ts wagon plugs

I Have been asked by a friend to change the plugs in the wagon and am looking for hints/tips...pictures would be really nice, order of operations, etc......ive changed plugs in jeeps and trucks but never a subaru so i want to make sure i do it right....thanks for the asap info
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Old 04-04-2008, 06:08 PM   #2
Scooby Newbie
Member#: 127878
Join Date: Oct 2006
Chapter/Region: MAIC
Location: Front Royal
2004 Impreza 2.5TS
2014 XV Crosstrek


Wait until the engine is COLD before you start removing the plugs. The heads are aluminum, and you run the risk of the threads coming out of them if you remove hot plugs from a hot aluminum head.

The plugs on a TS are really easy to replace. It's a SOHC engine, so the plugs are on top. Just follow the plug wires from the coil pack in the middle of the intake down to the top of the valve covers.

There are some things that are going to have to be removed/relocated temporarily during this procedure. On the passenger side, you'll need to remove most of the plastic intake piping. IIRC it's 3 or 4 10mm bolts, and then the whole thing comes off, exposing the plug wires. On the driver side, you'll have to either remove or at least shove the battery out of the way (when I changed the plugs on mine, I just loosened the hold-down and pushed the battery as close to the fender as it would go). Also, the washer bottle will have to come out as well. It's a pair of bolts on top, an electrical connection and 2 rubber hoses. When you pull the hoses off, the washer fluid will leak everywhere, so be ready for it.

Once you have all that stuff out of the way, it's a simple matter of pulling the plug wires off, removing the plugs and putting new plugs in. I think it took me roughly 40 minutes to replace the plugs and wires on my TS (admittedly, mine's an '04, so yours might be slightly different), and I was taking my sweet time doing it too.

As a word of advice, put a thin coating of anti-seize compound on the spark plug threads (don't get any on the electrode), to make them easier to remove next time, and put a small amount of silicone lube inside of the plug wires (helps prevent water vapor from causing misfires, as well as making the plug wires easier to remove next time) before installation.

I don't know where you're located, but if you're near Manassas VA, send me a PM and I'll help you with it.
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Old 04-04-2008, 10:44 PM   #3
Scooby Newbie
Member#: 145108
Join Date: Apr 2007
2002 Impreza TS
Aspen White


I used the pictures from the scoobymod tutorial as a guide when I did this for the first time, and found it helpful:


You don't actually have to remove the hose to the washer fluid resevoir, you can just set the bottle up on your strut tower. It's a little awkward, but less awkward than spilling fluid everywhere.

Also, I found I didn't have to remove the battery with the proper extensions for my socket wrench. I can't remember exactly what I needed, something like a 6" plus a 3".
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Old 04-05-2008, 08:28 AM   #4
Scooby Newbie
Member#: 176563
Join Date: Apr 2008

Thanks a bunch i should be able to get it done with this info......thanks for the offer but im in ohio.
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