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02-27-2017, 01:37 AM | #1 |
Scooby Specialist
Member#: 459287
Join Date: Dec 2016
Chapter/Region:
VIC
Location: Vancouver BC Canada
Vehicle:1998 JDM Impreza STi V4 GF8 White |
One oily spark plug
I pulled the spark plugs today on the EJ20K engine in this '98 Impreza STi that I've had for a couple months. First time I've ever pulled the plugs on a Subaru engine. Wasn't too bad with the battery and air filter box removed.
I suspect these NGK spark plugs (BKR6EIX-P) have been in this engine for a long time. Car has 140,000 km on it. I was a little disappointed to discover that the spark plug from cylinder #4 was rather oily. The sheen is quite noticeable on the ground electrode and on the nose of its ceramic insulator in the image below. I'm hoping this isn't an indication that major engine issues are imminent (or have already occurred). I want to replace these with regular BKR6E spark plugs. I see that NGK has a slightly different version of this plug, BKR6EYA which is supposed to be "fouling resistant". I thought maybe this might be worthwhile to try, keeping in mind that one cylinder seems to have an oil problem. Anyone have any thoughts on this? Any reason why using a "YA" plug (fouling resistant) would be a bad idea?
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Last edited by Vancouver98STi; 10-25-2020 at 03:08 AM. Reason: Replaced missing image |
02-27-2017, 09:26 AM | #2 |
NASIOC Supporter
Member#: 30669
Join Date: Dec 2002
Chapter/Region:
Tri-State
Location: USA, North NJ, 07456
Vehicle:1998 Legacy 2.5GT Silver Sleeper BK, 5MT |
I would stick with what you currently have in terms of type. Put in a new set and get 5-10k miles on them and pull to recheck.
Your current plugs may just be high miles and not dealing with a higher mileage engine well. If you change plug type, it's harder to compare them to what you currently have. If you're not,blowing a lot of blue smoke out the exhaust, I wouldn't worry about swapping plugs for a different type. In general, mixture looks a little rich. |
02-27-2017, 05:03 PM | #3 | ||
Scooby Specialist
Member#: 459287
Join Date: Dec 2016
Chapter/Region:
VIC
Location: Vancouver BC Canada
Vehicle:1998 JDM Impreza STi V4 GF8 White |
I have very limited experience with this car...
Quote:
Quote:
Last edited by Vancouver98STi; 10-25-2020 at 03:10 AM. Reason: Replaced missing image |
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12-13-2017, 08:59 PM | #4 |
Scooby Specialist
Member#: 459287
Join Date: Dec 2016
Chapter/Region:
VIC
Location: Vancouver BC Canada
Vehicle:1998 JDM Impreza STi V4 GF8 White |
An update on this thread...
I ended up reusing the BKR6EIX-P plugs (with new BKR6E spark plugs on reserve) just to see how well the engine would continue to run... and it's been fine. The reason for the update is that I also installed two custom made oil catch cans (discussed Here and more Here), which seem to be working well... and the #4 spark plug no longer has an oily sheen to it. Coincidence? I dunno... but I'm pleased. |
12-14-2017, 02:59 AM | #5 |
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12-19-2017, 08:27 PM | #6 |
Scooby Specialist
Member#: 59182
Join Date: Apr 2004
Location: N. Idaho
Vehicle:2002 WRX GG>> 2016 Focus RS |
Good news :-)
Ensure you check your oil level EVERY fuel (petrol in BC?) fill-up. If it's burning oil you don't want to wait 'til it runs low. If that oil light ever comes on it's usually too late. |
12-20-2017, 02:37 AM | #7 | |
Scooby Specialist
Member#: 459287
Join Date: Dec 2016
Chapter/Region:
VIC
Location: Vancouver BC Canada
Vehicle:1998 JDM Impreza STi V4 GF8 White |
Quote:
Deserved or not, the EJ20K has a reputation of being a ticking time-bomb... so yeah, I keep a pretty close eye on maintenance with this engine. |
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