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Guest Message by DevFuse

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Spark Plugs

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11 replies to this topic

#1 Twitch de la Brat

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Posted 02 April 2009 - 02:43 AM

OK. This applies to all generations of Subarus, so I figured the shop talk forum
would work the best, after all, this is definitely a topic that would come up in a
subaru garage or two.

I would like to know, kind of a poll situation,
what spark plugs people like to use in their cars.

Plus, I wouldn't mind if this could be linked to the USRM as a guide for those
looking to replace their spark plugs.

I personally like the bosch platinum +2's. Posted Image
My 85' BRAT and my 90' Legacy run beautifully with them.
They're not too expensive and they seem to have a good durability.


#2 lostinthe202


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Posted 02 April 2009 - 07:24 AM

I've read a lot on this forum about plugs (and wires). The EJ motors are apparently pretty sensitive to which brand of plugs are used and the consensus seems to be dealer wires and NGK plugs.

Personally, I've always used whatever was cheapest at the auto store in every car I've had including my '96 OBW. After I read all the info here about people have misfire codes, I was tempted to change, but I figured by then they were already 40k miles old, so I'd run them until the car started stumbling off the line like I always do.

The plugs that were in the car when I bought it (at 120k) started causing stumble at starts and when I pulled them out they had no electrode left and a gap of like .2 but I never got any codes so I figure my ecu isn't too picky.

#3 davebugs


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Posted 02 April 2009 - 07:34 AM

I've used a lot of Bosch being a VW guy. But I've had problems with them in lots of cars - including Volvo's. It seems the more exotic (multiple tips, rare metals) the more issues on a variety of cars.

I use the NGK Vgroove's with the green printing on all the Suby's that I do. Around 2 bucks each even at the big chain stores.

I have seen and removed well used Autolite plugs out of 2.2's and you certainly can't get any cheaper than them.

I only use Champions in lawn mowers. I used to be able to tell on an air cooled VW if it had ever had Champions in it. I think their thread pitch was a little off for that application.

I've even started putting NGK's in VW 2.0's with great success.

NGK is OEM for a lot of the GM Saturns.

I have used some Nippon/Denso's but not enough to have an opinion.

Price, performance, and not being finicky NGK's are shaping up to be my favorite plug. And the price isn't bad at all. Even the "laser platinums" the GF's 2006 Impreza takes really aren't that bad cost wise - IIR under 8 bucks. I think their interval had to do with no anti-seize from the factory more than wear. They looked fine when removed.

BTW - this has all the potential of becoming like an oil brand thread. It'll be interesteing to see where it goes. My observations above were from real world experience, we'll have to see who's experience's differ and what the scientists have to say.

Edited by davebugs, 02 April 2009 - 07:37 AM.

#4 SoobieDoo


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Posted 02 April 2009 - 08:25 AM

NGK's in my EA82. Never a prob with spark.

#5 The Dude Abides

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Posted 02 April 2009 - 09:49 AM

I put NGK plugs and wires in my suby but any other POS truck or chevy i owned i just threw in some champions. Seemed to work ok. My wallet is what usually dictates my purchases.

#6 Turbone


    The Original Rob

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Posted 02 April 2009 - 11:05 AM

NGK Iridium's in my RX and regular NGK's in the rest.
Have had no issues with any of them.

#7 mountaingoatgruff


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Posted 03 April 2009 - 01:01 AM

magnecor plug wires are great, been running them for about a year and transfered them to different cars twice now. pretty pricey but they're supposed to last much longer than anything else. i got them after putting brand new bosch wires on a 97 EJ22 and listening to it choke on it's own tears.

i got some ngk iridiums for my hatch when i finished the spfi. it had a nasty misfire and when i pulled them i found the center electrode of one had shattered. i gapped them carefully and i always use a wire-style gapper not the tapered gauge style so i'm inclined to believe it was a defect. probably not common but i just buy plain ngk's for my subarus now - no noticeable difference anyways.

#8 The Scooby

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Posted 03 April 2009 - 06:14 PM

Jap cars
NGK only


OEM only

the 2 pronged ones cut down on flash area so i do not use them.

#9 subieman666


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Posted 03 April 2009 - 07:13 PM

i have ran bosch platnum 4's in my 83 dl and never had any problem with them. in my 83 gl i am running ngk uridiums and no problem there either.

#10 mr_whirly



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Posted 10 April 2009 - 07:07 PM

Subaru factory manuals list NGK for spark plugs. I've always used them, never had a problem, and they are cheap.

#11 backwoodsboy



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Posted 11 April 2009 - 01:35 PM

All the plugs from subaru are NGKs ... and thats all we stock.

#12 erik litchy

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Posted 11 April 2009 - 04:09 PM

NGK copper in my subaru

im trying NGK copper in my jeep stroker but they have a very short life. about a year before the electrode is worn out. tried a colder heat range and same result. still runs better than any autolite or champions.

what do you think guys? this is about 8000 miles worth of wear. -1 heat range from stock

Posted Image

Edited by erik litchy, 11 April 2009 - 04:15 PM.
add pic

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