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Old 08-12-2017, 04:20 PM   #1
alordofchaos
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Default Spark plug reading - this is different

Plugs are about 6 months old, don't know how well it's showing up in the pics.
Oil on plugs 1, 3, and 4 so planning on new gasket. Gap does not look bad to the eyeball, did not check though. #4 has some damage to the insulator, looks like

The new thing is, each plug has a narrow notch in the electrode. Never seen that before. What causes this (spark being narrow and long, I assume), and how do I remedy it? Car runs fine, otherwise, so this surprised me.

The attached pics are the first set I've put in the car, the set in the car when I bought it can be seen here (no notches, but they were rusty and the gap was huge, very worn plugs)
http://www.saturnfans.com/forums/sho...postcount=5077

Thanks in advance
Attached Images
File Type: jpg plugs1.jpg (195.5 KB, 19 views)
File Type: jpg plugs2.jpg (188.4 KB, 19 views)
File Type: jpg plugs3.jpg (95.3 KB, 19 views)

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Old 08-12-2017, 04:49 PM   #2
OldNuc
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1998 SC2
Default Re: Spark plug reading - this is different

Those are BKR5E plugs and they come with that split center electrode. They are V-Power design.

Try a BKR6E V-Power plug, those look to be running a bit on the hot side and you are not burning lots of oil. Be sure you get the V-Power plug.

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Old 08-12-2017, 05:11 PM   #3
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Default Re: Spark plug reading - this is different

Quote:
Originally Posted by OldNuc View Post
Those are BKR5E plugs and they come with that split center electrode. They are V-Power design.

Try a BKR6E V-Power plug, those look to be running a bit on the hot side and you are not burning lots of oil. Be sure you get the V-Power plug.
Yes, those plugs look a little "Toasty" Try a heat range colder. Looks like some evidence of preignition as well on at least one of them.

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Old 08-12-2017, 05:35 PM   #4
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Default Re: Spark plug reading - this is different

Quote:
Originally Posted by alordofchaos View Post
. #4 has some damage to the insulator,
AS mentioned, the plugs looked baked and flaked away glazing on insulator is a giveaway.

Ever hear detonation/pinging...

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Old 08-12-2017, 06:44 PM   #5
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Default Re: Spark plug reading - this is different

That is most likely cooked on carbon. Plugs have been used way past replace time.

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Old 08-12-2017, 07:13 PM   #6
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Default Re: Spark plug reading - this is different

Quote:
Originally Posted by OldNuc View Post
That is most likely cooked on carbon. Plugs have been used way past replace time.
Yeah, I suppose, or I've even seen aluminum "plasma coating" from runaway detonation eroding the piston dome.

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Old 08-12-2017, 07:19 PM   #7
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Default Re: Spark plug reading - this is different

Very few if any of these engines suffer any preignition unless they are burning 85 octane fuel with the knock sensor failed and an SES light on. Other designs do indeed have issues though.

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Old 08-13-2017, 09:36 PM   #8
alordofchaos
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Default Re: Spark plug reading - this is different

Thanks, guys!
Apparently, I'm an idiot, not only did I forget the type of plugs I used, now that you mention it, I am sure I noticed the notch when I installed them back in February, thought to myself, "Huh, that's interesting" and them completely forgot about it

On the plus side, got some good advice on going to a colder plug, so I've got that going for me, which is nice.

No detonation or pinging, no codes (other a secondary O2 circuit which I keep forgetting to do something about, but do check the codes frequently to make sure something else hasn't popped up)
Will order plugs, wires, and gasket.

Side note: the wires are marked Packard, could be the OEM wires. Others have used the OEM wires over 100k miles without problems. Don't seem to be having any problems with them either, so did not change them whan I last changed plugs

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Old 08-14-2017, 09:38 AM   #9
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Default Re: Spark plug reading - this is different

That "Packard" is just a name. Standard Motor Products Blue Streak if you can find anyone who can order them for you. Other than that plain old mid priced wires work and none of them actually last for 100,000 miles in a Saturn as that is equivalent to 200,000 miles in conventional ignition.

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