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#2721648 - 08/21/12 10:22 PM Spark Plugs: '98 Corolla
NilsonCain Offline


Registered: 08/20/11
Posts: 63
Loc: Mobile, AL
Howdy there...

Just replaced plugs in my '98 Corolla. What I pulled out were NGK BKR5NKB twin-ground copper core. Specified gap is .044" and these old ones are worn to .060" - .070".

The new ones I bought are NGK BKR5EGP single electrode platinums. I gapped all to spec before installing. I put on new wires and a new PCV valve as well.

Previous owner did meticulous oil changes but he says he doesnt think the plugs were ever changed. I'm surprised that the car was still running if that is true. It has about 189,000 miles now.

Just looking for feedback.. were those stock plugs (possibly?) and is there any problem with the new ones I chose?

Also I took off the oil filler cap while the car was running and there was a significant amount of air blowing out, way way more than on my '96 4Runner V6 w/ 211k. I guess this indicates blow-by. The car is very good regarding oil consumption, considering what I've heard for this model... Seems to burn just over a quart in ~3000 miles.


Thanks


Edited by NilsonCain (08/21/12 10:23 PM)
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Nilson Cain
1998 Corolla 5-speed, 230k miles, Valvoline MaxLife 5w30

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#2721659 - 08/21/12 10:28 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5505
Loc: southeast US
I would do kreen treatments to stop consumption from getting worse. Clearly the rings are not in great shape from that amount of blow by.

My 2003 one shipped with iridium plugs. You might want to check if 98 was the same thing.

EDIT: Never mind, the 98 corolla specifies:

Quote:
Spark plug type:
DENSO K16TR11
NGK BKR5EKB-11


So, you do not have factory plugs.


Edited by friendly_jacek (08/21/12 10:37 PM)

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#2721674 - 08/21/12 10:45 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
LeakySeals Offline


Registered: 02/18/11
Posts: 5070
Loc: MA
There is a tag either on the hood or the passenger side of the head. Your 98 is Double Platinum. Just before the switch to Iridium. If it were me I'd use Iridium.

The 98-02 Corolla 1.8L I4 has a piston design flaw. Too few piston oil return holes that are too small. They clog after a while and when they do, oil scraped by the piston rings has nowhere to go but the combustion chamber. Oil consumption is a quart every 600-1500. The fix is a teardown and a few holes drilled, put the piston back. 80% of the corollas in this year experience the problem after 100k. Those that don't ran synthetic oil. Synthetic oil is a MUST! for your engine to prevent this from happening. Coolant is important too, the engines are known for hotspots.

Hope its not a 3 spd auto.
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#2721682 - 08/21/12 10:52 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
NilsonCain Offline


Registered: 08/20/11
Posts: 63
Loc: Mobile, AL
My bad, typo on the plugs -- BKR5EKB is what I pulled out.. so its the factory spec.

Regarding the oil consumption issue, I've read up on it, but my engine doesnt seem to be so bad.
_________________________
Nilson Cain
1998 Corolla 5-speed, 230k miles, Valvoline MaxLife 5w30

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#2721774 - 08/22/12 06:08 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
eagle23 Offline


Registered: 01/11/08
Posts: 424
Loc: Roswell GA
Maybe I'm really old school, but a quart in 3k for an engine with 189k simply isn't worth worrying about. I'd be proud cool

I wouldn't personally treat it with anything except maybe the synthetic oil as suggested.

Just my dos centavos.

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#2721788 - 08/22/12 06:35 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
Astro14 Offline


Registered: 10/10/10
Posts: 4618
Loc: Virginia Beach
On a '98 with that kind of miles, I wouldn't worry about that consumption (most manufacturers won't even consider warranty work until you're at 1 QT every 1,000 to 600 miles...). I wouldn't do much to the engine either, I would just use a synthetic (as leakyseals recommends) to keep it clean and enjoy your well-kept car!
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#2721835 - 08/22/12 08:00 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
javacontour Online   content


Registered: 06/26/03
Posts: 7677
Loc: Illinois
You can buy a lot of oil for the cost of doing the fix. Given the mileage on the car, I'm not sure it would be worth it.
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#2721858 - 08/22/12 08:19 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
Bottom_Feeder Offline


Registered: 12/07/08
Posts: 1476
Loc: Occupied Virginia
How easy or hard did the plugs come out of the head? I want to replace the original plugs on my wife's 2002 Corolla but I don't want to open up a can of worms.

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#2721868 - 08/22/12 08:27 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
LeakySeals Offline


Registered: 02/18/11
Posts: 5070
Loc: MA
The common response is "just use cheap oil". That mentality is what caused the clogged oil return problem. If you notice his signature you will see why his oil claim doesn't seem so bad. The T5 15w40 HDEO is not flowing to the rings, most of it is flowing through the oil pump release valve back to the sump. He's a new owner, he will soon find its more than he thought and nothing will stop the consumption short of freeing those holes. Why we sell. Why I have 08 GP not 00 corolla in my sig now. adding oil, driving around with oil, always worrying about it drove me nuts.

Sorry for sounding so negative.
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#2721869 - 08/22/12 08:28 AM Re: Spark Plugs: '98 Corolla [Re: Bottom_Feeder]
LeakySeals Offline


Registered: 02/18/11
Posts: 5070
Loc: MA
Originally Posted By: Bottom_Feeder
How easy or hard did the plugs come out of the head? I want to replace the original plugs on my wife's 2002 Corolla but I don't want to open up a can of worms.

So long as you don't do the work hot your fine. They come right out. The aluminum is soft, so do it cold. Use Iridium's
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#2722065 - 08/22/12 11:53 AM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
mechtech2 Offline


Registered: 09/05/06
Posts: 19479
Loc: Chicago Area
A filler cap blowby test shows nothing.
It SHOULD have movement, and cars differ.

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#2722131 - 08/22/12 12:55 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
Bladecutter Offline


Registered: 02/21/11
Posts: 893
Loc: Arvada, CO
Originally Posted By: NilsonCain
Howdy there...

Just replaced plugs in my '98 Corolla. What I pulled out were NGK BKR5NKB twin-ground copper core. Specified gap is .044" and these old ones are worn to .060" - .070".

The new ones I bought are NGK BKR5EGP single electrode platinums. I gapped all to spec before installing. I put on new wires and a new PCV valve as well.


Isn't there a sticker under the hood telling you that you need to use double electrode plugs on the car. I'm pretty sure that's what my gf's daughter's Corolla said when i did her spark plugs last year.

BC.
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#2722140 - 08/22/12 01:06 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
Quest Offline


Registered: 12/19/04
Posts: 6493
Loc: beaver land EH?
@LeakySeals: Those factory double-ground plugs are just copper (I serviced a lot of these corollas and I have a few used ones on hand for show-n-tell).

@ OP: you can replace them with better quality plugs such as single ground platinum or iridium and they will do just fine.

Corolla engines are quite easy on the plugs so no worries on them whether you have to go with single or multiple ground plugs or not.

Q.
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#2722380 - 08/22/12 05:26 PM Re: Spark Plugs: '98 Corolla [Re: LeakySeals]
friendly_jacek Offline


Registered: 05/04/03
Posts: 5505
Loc: southeast US
Originally Posted By: LeakySeals
The common response is "just use cheap oil". That mentality is what caused the clogged oil return problem. If you notice his signature you will see why his oil claim doesn't seem so bad. The T5 15w40 HDEO is not flowing to the rings, most of it is flowing through the oil pump release valve back to the sump. He's a new owner, he will soon find its more than he thought and nothing will stop the consumption short of freeing those holes. Why we sell. Why I have 08 GP not 00 corolla in my sig now. adding oil, driving around with oil, always worrying about it drove me nuts.

Sorry for sounding so negative.


The info on "clogged oil return problem" is very true and this is why I recommended Kreen treatment before it gets any worse. I was able to completely stop oil consumption in my corolla when it started circa 75000 miles. I was successful because I reacted early and did many different things before I succeeded.

I also noticed that the OP is using quality synthetic oil, which is a good thing in this car. He used some 15W40 oil only to bring viscosity up.

IMHO, even straight 15W40 would not be a problem in this car, this engine runs very hot on hwy (especially pistons). I would not recommend it for short trip city driving though.

One additional advice: keep oil level 0.5qt over the full level all the time. Later toyota revised the corolla dipstick to deal with the oil consumption. It was one of many things that worked for me.




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#2722556 - 08/22/12 09:02 PM Re: Spark Plugs: '98 Corolla [Re: NilsonCain]
Papa Bear Offline


Registered: 08/11/05
Posts: 6127
Loc: Leamington, ON, Canada ..... r...
Do you have the owner's manual?? I had a '98 and I'm sure the manual said to use the dual ground plugs and not to use single ground plugs.
I always got plugs from the dealer, the price was inline and they were OE plugs. I had no problem with the car for 150k miles, no oil consumption problem.
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