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Old 07-03-2008, 12:58 PM   #1
Frogsthatmoo
Scooby Specialist
 
Member#: 153374
Join Date: Jul 2007
Chapter/Region: South East
Location: Ocala, FL
Vehicle:
2001 Outback Wagon
White

Default New Spark Plugs

So, my engine is feeling a little sick so I've decided to replace the spark plugs in hopes that will make him feel a bit better.

The problem is when I'm on the gas (either accelerating or just cruising, except when accelerating hard or coasting) the car feels a bit as if it's running out of gas. It's hard to explain but that's how it feels. As the RPM's climb I can see the gauge kind of jump up and slow down about every 250 revs. I can physically feel the car "lurching".


What spark plugs does NASIOC recommend for a 97 Legacy GT? Also, what is the gap requirement for the new plugs?


And if anyone knows anything else I can do to tune up the motor a bit, please tell me.
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Old 07-03-2008, 01:21 PM   #2
fastenova
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Join Date: Jun 2003
Chapter/Region: NWIC
Location: Tigard, OR
Vehicle:
Not your usual 1997
Legacy GT

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NGK V-power copper plugs (BKR5E-11) if you don't mine changing them every 30K. If you want a longer maintenance interval go for NGK plats (PFR5B-11). Gap should be preset, but it's .044.

DO NOT put Bosch plugs in a Subaru motor. You will have nothing but problems, in my experience.

As far as the lurching, make sure your transmission ground is making good contact. How long has this been going on? Is it subtle or very rough? Check and consider replacing your plug wires when you do the plugs. I had some similar stubling that was fixed by replacing several hard vacuum lines - I think I had a tiny leak and it was confusing the ECU and making it screw with the timing. So, check all the vacuum lines. When was the fuel filter last replaced? What about the air filter? Those are good maintenance items to check.
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Old 07-04-2008, 12:45 AM   #3
Frogsthatmoo
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Chapter/Region: South East
Location: Ocala, FL
Vehicle:
2001 Outback Wagon
White

Default

Thanks a ton fastenova. The fuel filter is a good idea also. Should I just search for how to replace the air filter on my car, or do you happen to know how? I mean I could probably find it somewhere, but...

Again thank you for all your info.
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Old 07-04-2008, 06:50 AM   #4
Jonathan
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Join Date: Feb 2001
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Location: Natick, MA USA
Vehicle:
1999 Legacy GT Ltd
Quick Silver Metallic

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Quote:
Originally Posted by Frogsthatmoo View Post
Thanks a ton fastenova. The fuel filter is a good idea also. Should I just search for how to replace the air filter on my car, or do you happen to know how? I mean I could probably find it somewhere, but...
The air filter is in that silly little black plastic thing near the right front (passenger side) with all those metal clips around it. Just flip all the clips open and lift the rear half (with the longish round black plastic tube) up and back enough to reach the filter and replace it.

The fuel filter is that cute little round metal canister on the left rear (driver's side) with a bunch of rubber fuel lines attached to the top of it. It isn't that far from the master cylinder. Don't confuse it with the plastic charcoal canister that is part of the emissions system. Also please be aware that the fuel system is pressureized a bit. Either let the car sit a while, or remove the fuel pump relay fuse and run the car (idle) for a minute or two (or until it stalls) and place a bunch of rags under the fuel lines so when you remove them any excess fuel (gasoline) doesn't spray all over a hot motor and start a fire.
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Old 07-04-2008, 10:11 AM   #5
Frogsthatmoo
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White

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Yeah, I meant fuel filter. I wrote that at really late, so my brain wasn't working right. I know how to change the air filter
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Old 07-08-2008, 04:20 PM   #6
jey
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Chapter/Region: TXIC
Location: Johnson City, TX
Vehicle:
2011 Tribeca
1995 Legacy Wagon

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Fuel filter is easy too. As posted de-pressurize the system, and then it's just two hoses (and hose clamps) and I believe a bolt for the clamp that keeps the filter in place. Don't lose track of which hose is which - if the filter is installed backwards I don't think the car will run...
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