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Unread 01-14-2014, 07:48 PM   #1
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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Unread 01-14-2014, 08:13 PM   #2
bigbossd1030
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Get a Haynes manual. The back had this picture with descriptions of each common problem.
image-4161826939.jpg

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Unread 01-14-2014, 08:27 PM   #3
Jeepsr4me
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That one looks like its getting hot spotted.
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Unread 01-14-2014, 09:14 PM   #4
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.
image-4117054423.jpg

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Unread 01-14-2014, 10:54 PM   #5
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.

Sent from underneath my Jeep
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Unread 01-15-2014, 07:40 AM   #6
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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Unread 01-15-2014, 06:08 PM   #7
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.
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Unread 01-16-2014, 06:00 AM   #8
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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