Round Two--Spark Plug/Misfire Issue
04-22-2007, 08:35 PM
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Round Two--Spark Plug/Misfire Issue
About 8000 miles ago i replaced all 8 plugs and wires, due to misfire. About 200 miles after i replaced them truck started misfiring again. So i found that plug #3 i believe(third one back when standing in front of truck, driver side) was the problem. I pulled it out and found a big problem. The electrode itself had bent inwards, and was embedded into the rest of the plug. Replaced plug, truck ran fine since. Now starting tonight on the way back from work truck started misfiring again. Sounds like it may becoming from same cylinder. Haven't had a chane to pull yet,will tomorrow, but if its the same problem as before, any guesses that could be causing this? This is the only plug that has given me trouble in the 8000 miles i have put on since. Any help would be appreciated.
04-22-2007, 09:58 PM
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Does it look like something hit the plug to bend the electrode like that? Does it look melted. If it looks melted I would check for a vacuum leak on that cylinder causing it to run lean or a bad injector. If it looks like something it hitting it check for excessive carbon buildup in the EGR passages.
04-22-2007, 10:19 PM
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Well it doesnt look like anything hit it. Does look like it ran hot, either some of the insulation melted out of it, or when the electrode went inside it may have broke it. Now where is the vacume line for this cylinder located? And where is the EGR(not sure what that stands for either)passage and if it is built up with Carbon how do you go about cleaning it.
04-23-2007, 07:12 AM
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Well it doesnt look like anything hit it. Does look like it ran hot, either some of the insulation melted out of it, or when the electrode went inside it may have broke it. Now where is the vacume line for this cylinder located? And where is the EGR(not sure what that stands for either)passage and if it is built up with Carbon how do you go about cleaning it.
EGR = Exhaust Gas Recirculation. It is a valve that allows Exhaust gases to go back thru for a "cleaner" burn in the exhaust. Get a Hayes manual if you are gonna tackle this yourself, other than that all I can do is reccomend you take it to a good shop. Fix it now before it does serious damage. Engines are expensive compared to a few hundred at a shop.