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Username Post: Seeing a black spot - plugs        (Topic#364614)
4dr 57 
Valued Contributor
Posts: 4735

Loc: Texas Hill Country
Reg: 11-10-04
03-14-21 04:15 PM - Post#2816154    


Finally got around to pulling the plugs - '97 LT1
engine in a 57. It was not easy. Anyway just about all but 1 of the 6 that are out has 1 small(ish) black spot on the side of the insulator.

Is something going on inside the engine that I need to check out?

It didn't use any oil to speak of that I can remember but maybe just a little. Maybe.
The rear exhaust pipe is a little sooty, though if I drove it normally all the time I might have a better idea.

The car's been sitting idle for about 4 years.
I run it for about a half an hour ever so often, change the gas once a year, and check the grounds for corrosion every summer is about all besides trying to make stuff better, so I'm concerned that something may be wrong.

It's only been 10K road miles since I changed the plugs although the motor only has a total of 36K original miles on it so some plugs may be the originals.

Thanks.
Stan



It's all good. Mostly


 


Bad56Sedan 
"14th Year" Gold Supporting Member
Posts: 1353
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
03-15-21 05:09 AM - Post#2816178    
    In response to 4dr 57

Like this?
Or like measles?


Attachment: image.jpg (162.66 KB) 0 View(s)




VC56S 2 door Sedan, 40 Years

[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image]


 
4dr 57 
Valued Contributor
Posts: 4735

Loc: Texas Hill Country
Reg: 11-10-04
03-20-21 05:37 AM - Post#2816448    
    In response to Bad56Sedan

Hi Bad 56 - and Thanks for the reply.

Just like that only much blacker!






It's all good. Mostly


 
Bad56Sedan 
"14th Year" Gold Supporting Member
Posts: 1353
Bad56Sedan
Loc: Pasadena, Texas
Reg: 04-29-04
03-20-21 05:29 PM - Post#2816488    
    In response to 4dr 57

The plug in the picture is from my 2011 Tahoe, 5.3 vortec.
This is the original delco plug with 60k miles.
I would say this type fouling is normal due to all 8 plugs looking the same.
I agree it is not like a carb motor type fouling and looks odd.
Perhaps this dark spot faces the intake/exhaust valve?



VC56S 2 door Sedan, 40 Years

[image]https://www.chevytalk.org/fusionbb/fbbavatars/a v-3564-1354211547.jpg[/image]


Edited by Bad56Sedan on 03-20-21 05:34 PM. Reason for edit: No reason given.

 
4dr 57 
Valued Contributor
Posts: 4735

Loc: Texas Hill Country
Reg: 11-10-04
03-21-21 07:31 AM - Post#2816507    
    In response to Bad56Sedan

[image]https://ibb.co/T8cvNwf[/image]

Try as I may - no photo -sorry.

Yes our pictures look similar. The dark spot is even on the same side of the electrode, but my plugs are much much darker as in black, for some reason.

Gap is .050 =/- a few thousandths. # 41-943. it may be out of date for a '97 engine by now.
It's frustrating. Seems like the plug isn't the right temp range or something.

Hope they are blacker only because while the engine has only been idled until hot, the fans cycled a few times (during the summer) there has not been a load placed upon it.






It's all good. Mostly


Edited by 4dr 57 on 03-21-21 02:00 PM. Reason for edit: No reason given.

 


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