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Old 05-12-2021, 09:27 PM   #1
cujoe_da_man
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Default I Might Need New Plugs...

I mean, whatcha'll think?

BTW, this is a car that literally just rolled over 160K miles yesterday.
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Old 05-12-2021, 11:00 PM   #2
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Default Re: I Might Need New Plugs...

When in doubt, change 'em out.


Plugs are cheap.
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Old 05-13-2021, 12:20 AM   #3
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Default Re: I Might Need New Plugs...

I've seen worse! I took a set over 100K in the '99. Sort of stupid but it ran good for a long time until it didn't.
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Old 05-13-2021, 12:18 PM   #4
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Default Re: I Might Need New Plugs...

If I'm not mistaken, stock plain plugs are gapped to 0.040". If an inexpensive plug gap isn't used, try a dime. At 0.053", if a dime fits easily into the gap, replace them. If you're trying to save money, a gap tool can file the outside and center electrode square. Then close the outside electrode until the proper gap is achieved. For the S-series, plain plugs replaced or cleaned and gapped every 30k miles. Platinum plugs aren't recommended as they cause misfiring issues. You can search past threads of members mistakenly using platinum plugs and finding problems that misled them into chasing their tail until made aware of issuing plain plugs.
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Old 05-13-2021, 03:38 PM   #5
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Default Re: I Might Need New Plugs...

Oooooh no, I don't skimp when it comes to plugs :P

I think there was only one time that I reused some old plugs, but it was for testing for an issue and drove with them for a shot period.

Just got out today and replaced all the plugs and wires and holy smokes, what a huge difference. I mean the car ran ok before, but I always had this vibration at about 900-1000 RPM (which, ironically, is what the car was idling at all the time before I changed the thermostat ). Made sure they were all gapped at .04.

Now it has a little bit of vibration (typical old 4cyl shakes), but I don't feel like I'm gonna shake all the dust off sitting still! I must have been firing on the equivalent of 3.5 cylinders. I guess I'll know more when I actually get out to drive it, but I also unplugged the battery to reset the PCM too since it's been driving with those bad plugs all this time.

I also removed the cover on my positive battery terminal and cleaned all the chalk off, gonna have to get some cleaner to get all the acid off, so that might help with things too!

On the topic of platinum plugs, were they using AC Delco Rapidfire plugs and were they using the proper part number? I've used Delcos in all my cars from the mid 90's to today and never had an issue with misfires. Not saying you're wrong, I'm just curious now because I have heard if you use other brand plugs in GM cars that it can cause issues, especially if you're getting super high-end plugs or some strange metal type that is made for like big V8's or high performance cars.

I had an '84 Camaro with a five speed and 2.8 and I tried some Bosch plugs in it... I went back and put Rapidfire in it after that (this was the mid 2000's).
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Old 05-13-2021, 05:26 PM   #6
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Default Re: I Might Need New Plugs...

Rock Auto or O'Reilly Auto are my go to place for plugs...

Note that I am running one heat range colder than stock...

https://www.ngk.com/how-do-i-find-a-...-hotter-plug-3

https://www.rockauto.com/en/catalog/...park+plug,7212

Don't forget the anti seize...
https://www.oreillyauto.com/detail/c...ant/ver0/13111

Note that the OEM NGK copper plugs have a new version, the V-Powers....
OEM - NGK 7755, BKR4ESA-11
New Design NGK 5424, BKR4E-11

One colder for the SL1 would be BKR5ESA-11 or BKR5E-11
One colder for the SL2 would be BKR6ESA-11 or BKR6E-11
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Old 05-13-2021, 06:30 PM   #7
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Default Re: I Might Need New Plugs...

Ugh, I did forget the anti-seize... but I have to go back and get some boot goop anyway, I ran out, bleh.
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Old 05-13-2021, 08:40 PM   #8
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Default Re: I Might Need New Plugs...

Search for waste spark ignition system here or on the web for how the S-series creates spark and doesn't seem to work with platinum plugs. Unless GM specs call for them, it's generally the rule to follow owner's manual or GM service manual specs. Once a different type plug is used, you become the beta tester.

That 'chalk' is dried battery acid from vapors venting. Warm water and baking soda is all that's needed with an old toothbrush as this reacts immediately to battery acid by bubbling and neutralizing acid for plain water rinse. Battery cleaner in a spray can is baking soda with a heavy sticky colored grease to dissolve and coat battery terminals. Sulphuric acid is neutralized with baking soda.
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Old 05-13-2021, 09:50 PM   #9
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Default Re: I Might Need New Plugs...

Yeah, I just need to get some proper cleaning stuff for it, I just call it chalk because that's what it looks and feels like :P
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Old 05-14-2021, 02:44 AM   #10
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Default Re: I Might Need New Plugs...

Wow, I don't think my originals looked that bad when I changed them out... I assume they were originals, they had GM part numbers, and I don't think said AC on them. I think they were NGK with GM numbers.
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Old 05-14-2021, 07:52 AM   #11
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Default Re: I Might Need New Plugs...

Quote:
Originally Posted by 454cid View Post
Wow, I don't think my originals looked that bad when I changed them out... I assume they were originals, they had GM part numbers, and I don't think said AC on them. I think they were NGK with GM numbers.
From what I could tell, these were original plugs and wires and if not, they've only been changed once the entire life of the car. Either way, it was time for a change
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Old 05-15-2021, 01:28 AM   #12
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Default Re: I Might Need New Plugs...

Quote:
Originally Posted by Waiex191 View Post
I've seen worse! I took a set over 100K in the '99. Sort of stupid but it ran good for a long time until it didn't.
Same: The OEM plugs were fine one day and the next needed replacing ...at 114K lol
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