Well it all started when I was trying to fix my idleing issues today. I was about a block away from my house and decided to look at a few things under the hood. I pulled vacuum line off of the EGR valve and noticed that it would only start sucking when givin throttle so I switched it with a line that was sucking in air all the time. Well it seemed to idle alittle bit better so I start driving it and hear the dreaded knocking noise from my motor, I quikly pull over and switch the vacuum lines back how they were, but its still knocking. I limp it home and shut it down, well 5 minutes later I start it up to see if I can pinpoint where the knocking is coming from, but it was'nt knocking after I started it. I ran a compression check and when I got to Cylinder #8 I found a crushed spark plug, changed that and it runs fine now. Im assuming it didnt hurt any valves seeing as the compression on all 8 cylinders matched. My question is that, what caused this? Im assuming if it was a streched piston or something it would keep knocking. Did messing with the EGR valve somehow throw my timing/or computer way off?
crushed cyl #8 sparkplug
- Thread starter gabe3586
- Start date
My first question is;
Are you positive you gapped each plug and checked it again before installing it?
IMO, and it doesn't mean much when I don't know what you have in "it"... but there's no explanation for your plug to have have a bent ground electrode while installed in your running engine. My first guess would be that you dropped/pushed it into the plug boss, it smacked the side of the plug hole and bent the electrode.
My next question;
Did you replace your plugs with a different tip? Example; did you go from a standard tip to an extended tip or possibly a 3/4" threaded boss plug?
Are you positive you gapped each plug and checked it again before installing it?
IMO, and it doesn't mean much when I don't know what you have in "it"... but there's no explanation for your plug to have have a bent ground electrode while installed in your running engine. My first guess would be that you dropped/pushed it into the plug boss, it smacked the side of the plug hole and bent the electrode.
My next question;
Did you replace your plugs with a different tip? Example; did you go from a standard tip to an extended tip or possibly a 3/4" threaded boss plug?
Your telling me, I drove it around last night trying to get it to repeat the problem but it never did.
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