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  #1  
Old 10-02-2016, 02:40 PM
NYCMOS NYCMOS is offline
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WHAT DOES THE STATE OF THESE SPARK PLUGS MEAN?

My engine was running a little rough so I did a tuneup and changed the plugs. The plugs look rough.

https://s17.postimg.org/vbwsg3p27/image.jpg
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  #2  
Old 10-02-2016, 02:43 PM
wiley-moeracing wiley-moeracing is offline
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there shot. need a closer look to tell why
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  #3  
Old 10-02-2016, 03:30 PM
joe joe is offline
 
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First impression: you've got issues. Hard to tell though from that pic. Got any better pics of just the business ends?
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  #4  
Old 10-02-2016, 08:33 PM
NYCMOS NYCMOS is offline
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I'll take better picture tomorrow, seems heavily ash fouled. Runs fine now, wondered if it was a sight my valve guide seals are in need of replacement.
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  #5  
Old 10-02-2016, 08:45 PM
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FSJunkie FSJunkie is offline
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These engines tend to ash foul even when they're in perfect running condition and don't burn oil.

They look like they just have a ton of miles on them. Should have been replaced long ago.
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  #6  
Old 10-03-2016, 07:52 AM
NYCMOS NYCMOS is offline
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The problem is they aren't that old or have that many miles on them. I pulled them to get look at them because of rough idle and wanted to do compression testing. Once I saw how bad they were knew they needed to get replaced. No it runs fine. No noticeable loss of oil why I was thinking maybe valve guide seals.
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  #7  
Old 10-03-2016, 08:03 AM
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tgreese tgreese is offline
 
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Quote:
Originally Posted by FSJunkie
...

They look like they just have a ton of miles on them. Should have been replaced long ago.

Yep. One looks clean, maybe that was replaced, or running lean? Lots of deposits - something in the fuel? I'd get some new ones and run them for a while. Then pull and assess.

Also, there is black carbon that's typical of cold start, with tan insulators. Ideally you drive the car on the highway and look at the plugs after that to avoid the cold-start appearance.

Bad valve seals tend to give you a puff of blue smoke at the tailpipe when you back off of the throttle. Vacuum goes up and pulls more oil in through the valve stems. Have you checked the compression, wet and dry? Have you felt the exhaust for a steady stream or puff-puff?
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Last edited by tgreese : 10-03-2016 at 08:08 AM.
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  #8  
Old 10-03-2016, 03:43 PM
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FSJunkie FSJunkie is offline
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Those plugs are severely worn. The electrodes are nearly completely gone from several of them. I don't care about their color or deposits, I'm looking at the electrode wear that indicates mileage.

Exactly how many miles did you put on them? Those are not platinum plugs; they need to be replaced every 12,000 to 15,000 miles. Those look like they have well over double that.
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  #9  
Old 10-03-2016, 03:54 PM
NYCMOS NYCMOS is offline
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They have around 10,000 miles on them, not sure why they are so worn so early.
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  #10  
Old 10-03-2016, 05:44 PM
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serehill serehill is offline
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Really

Quote:
Originally Posted by NYCMOS
They have around 10,000 miles on them, not sure why they are so worn so early.



Clearly byproducts of a tired worn out mis-tuned motor. Pretty clear she's tired. The unballanced burn detects you need to run a compression check. That's Rings & valves


The bad plug wires causing the arc burns aren't helping either.
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If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 10-03-2016 at 05:49 PM.
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  #11  
Old 10-03-2016, 05:55 PM
NYCMOS NYCMOS is offline
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Compression seems good, all cylinders are between 135-145. Runs fine now, hand an electrical issue in past few months where I think I was getting weak spark, maybe be the culprit. Fine now so I'll check it in a few months.
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  #12  
Old 10-04-2016, 09:10 AM
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serehill serehill is offline
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Absolurely

Could be bad spark. You would have not convinced me it had that kind of compression. Then it was really badly tuned.
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80 Cherokee
360 ci 727 with
Comp cams 270 h
NP208
Edlebrock performer intake
Holley 4180
Msd total multi spark.
4" rusty's springs
Member, FSJ Prissy Restoration Association

If you can't make it better why waste your time. No use repeating the orignal mistakes. I'm to old to push it that's why.

Last edited by serehill : 10-04-2016 at 09:41 AM.
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  #13  
Old 10-11-2016, 06:14 AM
rocklaurence rocklaurence is offline
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Possibly go to a hotter spark plug to burn that stuff off. Are you using the correct heat -range?
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  #14  
Old 10-12-2016, 12:40 AM
Shep 762 Shep 762 is offline
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Means it's time to sell it. I'll give you $270 and you don't have to worry about it ever again
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  #15  
Old 10-18-2016, 10:58 PM
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letank letank is offline
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the plugs look tired but not too bad compared to mine that did not show any signs of troubles, but it had been 6 years and I took a peek... funny, because these passed smog with flying colors...
thank you TFI and large cap distributor

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74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 226 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

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  #16  
Old 10-19-2016, 01:07 AM
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FSJunkie FSJunkie is offline
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That's just nasty. Oil burning.
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  #17  
Old 10-19-2016, 06:47 AM
JeepJeepster JeepJeepster is offline
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Not sure how that engine was running on all cylinders...
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  #18  
Old 10-21-2016, 01:31 AM
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FSJunkie FSJunkie is offline
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Quote:
Originally Posted by JeepJeepster
Not sure how that engine was running on all cylinders...
The scary thing is when the plugs deposit that bad, you know that everything else in the combustion chambers are also.

...including the top ring lands. Carbon forms on the top ring lands between the pistons and the cylinder wall, then when you take the car up on the highway and get the engine good and hot the pistons expand and the carbon on them scratches the cylinder walls.

Gums the heck out of the valves.

Not fun stuff.
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I love how arguements end as soon as Ristow comments. Ristow is right...again.
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  #19  
Old 10-22-2016, 11:05 PM
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letank letank is offline
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Quote:
Originally Posted by JeepJeepster
Not sure how that engine was running on all cylinders...

Running on all cylinders, passed smog with flying colors....
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Michel
74 wag, 349Kmiles on original ticker/trany, except for the rust. Will it make it to the next get together without a rebuilt? Status: needs a new body.
85 Gwag, 226 Kmiles. $250 FSJ test lab since 02, that refuses to give up but still leaks.

See Ouray 2013, Engine bits and Fuel and brake lines, and Body work
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