post #1 of Old 01-14-2014, 07:48 PM Thread Starter
lander2312
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spark plug help with pictures

I know my 93 yj is close to 21 years old and the original 2.5 runs fine for its age but if it can run better why not. The following pucs are of spark plugs with approximately 2k miles on them. They are in order from the radiator to the tub ( front to back). Do they look normal...any issues? Thanks.










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post #2 of Old 01-14-2014, 08:13 PM
bigbossd1030
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Get a Haynes manual. The back had this picture with descriptions of each common problem.
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post #3 of Old 01-14-2014, 08:27 PM
Jeepsr4me
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That one looks like its getting hot spotted.
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post #4 of Old 01-14-2014, 09:14 PM
rocketboy
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Here you go.

Someone posted this on here a while back and I saved it.

The ones on the ends look normal. The second one looks kind of burnt. And I don't understand the third one where the ceramic looks bright white.

I'm sure someone smarter than me will chime in.
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post #5 of Old 01-14-2014, 10:54 PM
jokerchief462
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While the plugs are out do a compression test.

Compare your plugs to the chart they are actually not drastically bad. 1/4 look fine 2 needs a look and three should match a picture with a good description.

How old are the wires/ cap/ rotor???

Are your trips long short???

What kind of fuel you run??

Are the compression readings within limits meaning optimum is 150 psi and all should be within 10 psi of each other.

Personally I wouldn't get too worried unless the compression is off. Drive it like you stole it.

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post #6 of Old 01-15-2014, 07:40 AM
vadslram
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1 and 4 look normal, 2 looks like carbon build up but could be oil. Is it greasy or dry? #3 is a tough one. It looks like it hasn't been firing at all or is being washed with raw gas. Check the intake runners and wires on 2 and 3 something is up with them.
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post #7 of Old 01-15-2014, 06:08 PM Thread Starter
lander2312
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I should have stated in the first post I also replaced and used all new wires to the plugs. 2 is dry and I believe it to be carbon. 3 was not in near as tight but that is odd since I put them in myself and it was tight...not sure how it loosened up.

"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."

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post #8 of Old 01-16-2014, 06:00 AM
vadslram
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new wires don't always garauntee good.
manufacturing defects, installation oopses. Many things can mess it up.
Did you clean the threads in the block before you put in the new plugs? could have had crud that made the plug feel seated firmly but loosened up after running a little while.
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