Spark Plug Diagnosis...
 

Spark plugs. B1TCH to change on the L-98. Heres some pics to help you guys diagnose your plugs when you finially get them out.

1st pic: Oil fouled.

2nd pic: Carbon fouled.

3rd pic: Too cold

4th pic: Hot/lean ignition

5th pic: DAMN GOOD!!! This is what we are aiming for. But I highly doubt yours looks like that or else you wouldnt be reading my post.

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RE: Spark Plug Diagnosis...
 

Ok so basically what it comes down to is this. The butt of the spark plug shows you whats going on in the engine. Once you can diagnose your plugs, you can stop a potential problem. A big problem is misfiring. Thats why you wont to keep your timing correct, heat range good...ect. ect. ect. Now a problem with mine is the oil fouled plug. I have a worn pistion ring which is seeping oil in there. Oh well it wont kill the car.:D Too rich of a fuel means trouble in the ignition timing. Ignition timing may be to advance. Check into that a.s.a.p. Now if your your lucky then you can sneak away with the good covered plugs that are just old. So consider yourself better off than the rest of us. But even you dont get past the knuckle busting of the L-98 plugs:D HaHa. Well I hope this helped some of you guys out. Good luck and if you have some quiesitons please post them. Either I or someone else will try to answer it to your understanding.