needs help.... bent spark plug electrode
03-23-2006, 08:15 PM
#1
needs help.... bent spark plug electrode mods are in my sig. these plugs are maybe 3 weeks old with not even 400 miles on them. put in brand new went straight to dyno shop. 40 miles or so. ran on dyno maybe 6-7 times ran fine. ran on the bottle twice on the freeway since then and the second time around car misfired while driving and i pulled this out. one thing to note was i misshifted 3-2 over a month ago. what could have caused this before i pull the heads off. will do leak down test. and this is plug number 8. other seven are fine. they were gapped at 42
Last edited by SVC707; 03-24-2006 at 08:08 PM.
03-23-2006, 08:43 PM
#2
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Definitely do the leakdown test, that is a very bad sign. One possible cause could be a piece of piston ringland..... Or it could simply be you bent the electrode when installing the plug and the car was able to fire for a while despite it.
03-23-2006, 09:03 PM
#3
the plug is sitting flat together. and im sure it was like that since i put them on. im also thinking how about valve float. be it im running the crane rocker arms with just the ls6 springs. if a valve drops it can touch the spark plug? you can actually see marks on the curved end of the electrode. not gouged <SP> just nicked
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03-24-2006, 12:38 PM
#10
Don't say can't.
It could (valve strike) but it would be a MESS.
Do a compression test and if you can, get a borescope and insert it in the plughole and look for damage.
Also, your picture of the plug shows some carboned threads near the tip.
Are you sure that the plug isn't too long?
My $0.02
It could (valve strike) but it would be a MESS.
Do a compression test and if you can, get a borescope and insert it in the plughole and look for damage.
Also, your picture of the plug shows some carboned threads near the tip.
Are you sure that the plug isn't too long?
My $0.02
03-24-2006, 03:54 PM
#12
Originally Posted by heavymetals
Don't say can't.
It could (valve strike) but it would be a MESS.
Do a compression test and if you can, get a borescope and insert it in the plughole and look for damage.
Also, your picture of the plug shows some carboned threads near the tip.
Are you sure that the plug isn't too long?
My $0.02
It could (valve strike) but it would be a MESS.
Do a compression test and if you can, get a borescope and insert it in the plughole and look for damage.
Also, your picture of the plug shows some carboned threads near the tip.
Are you sure that the plug isn't too long?
My $0.02
03-24-2006, 08:04 PM
#14
added few more pictures to clearly see the plugs. remember i drove it another three miles misfiring with the ses light blinking so it was dumping a hell of alot of fuel you could smell it out the back
Last edited by SVC707; 03-24-2006 at 08:10 PM.
03-29-2006, 09:09 PM
#15
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Originally Posted by orangeapeel
He must have had a hell of a time putting that thing in if it is bent down like that. 
Any updates?
03-29-2006, 09:22 PM
#16
i dont see why people think its so hard to change these plugs is all im saying... but nah i got too ripped drinking this past weekend and did not do any tests but im hoping to get to it this weekend.
oh yeah i did change all 8 with no change.. still not running right.. got too lazy to take it out again to see what it looked like. i just hope heads are readily available when i order them
oh yeah i did change all 8 with no change.. still not running right.. got too lazy to take it out again to see what it looked like. i just hope heads are readily available when i order them
03-29-2006, 09:24 PM
#17
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Tune.
Does the electrode look like it was hit???
My best guess...some NASTY detonation.
Mine did this to a plug with no damage to anything. Still had the detonation issue once the plug was replaced. Filled up with different gas and it worked itself out. Very odd. Basicly a fluke.
Does the electrode look like it was hit???
My best guess...some NASTY detonation.
Mine did this to a plug with no damage to anything. Still had the detonation issue once the plug was replaced. Filled up with different gas and it worked itself out. Very odd. Basicly a fluke.
