engine misfire
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Hey everybody.Got a 95 ls400 with misfire . I put new plugs in a few months ago went with autolite double platinum which were good for about a month or so. Started to misfire but didnt have money to buy the good plugs immediately. Eventually i got some NGKs double plat. but still misfiring. Scanner pulled p300 p305 and p307. Changed cap and rotor with no luck. . I got new plugs/wires cap and rotor. Also the idle is higher than usual when engine starts plus the idle drops while in drive at random. Any suggestions
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i pulled plugs 5&7. 5 was black and 7 was white these are new plugs not more thatn a month or two old. also the wires which are also new the wire to plug 5 was slightly burned wha tmigh this indicate. I would post a pic but i dont know how
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Ok, I have the photos downloaded to my PC but when I click below on "go advanced" and try to insert photo, it ask for a URL for the image. Sorry but I'm new to these forums and haven't yet familiarized myself with it yet.
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![](http://http://s1081.photobucket.com/albums/j348/bigraydogg1/?action=view¤t=51dc5d17.jpg)
this is what cylinder 5 plug looked like it was black but not wet (no oil) the plug wire is shown above
Last edited by bigraydogg; 03-16-12 at 07:54 PM.
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I suspect you have injector issues at #5 and 7. Curiously, what gas are you using? Some like the Chevron Techron FI cleaner, your choice. Try that and see if there are changes. If you have a bore scope, I would take a look inside the cylinder and see how the piston top is.
The boot concerns me. Since this was new, I suspect that it is seeing higher than average temps and it is arcing. Maybe someone else has a different interpretation...?
The boot concerns me. Since this was new, I suspect that it is seeing higher than average temps and it is arcing. Maybe someone else has a different interpretation...?