Knocking

[462cutty]

What's up guys? just a quick question...If you pull one spark plug wire at a time and your engine goes from tapping to knocking at a specific cylinder what are possible causes?

 

[somaphox]

id assume rod knock

 

[airboatgreg]

I would agree with that. Crankshaft or camshaft speed would be my next question.

 

[462cutty]

id assume rod knock

Okay. Everything I've read online says it should get quieter or go away completely if it was rod knock. Had me confused

 

[462cutty]

I would agree with that. Crankshaft or camshaft speed would be my next question.

What do you mean by camshaft speed?

 

[Clutch]

Don't hate me guys I'm going to reveal a dark part of my past with this one. When I was a used car dealer in highschool I learned if you had a motor with a rod knock you could ground the outer electrode to the inner on that cylinder and it would have a dead miss but not knock so I could unload it at the auction. So by pulling the plug wire on a rod knock would make it go away or at least quit down not get louder I think your issue requires at least a partial autopsy good luck and sorry for your loss

 

[565bbchevy]

I want a refund plus interest.

 

[pagrunt]

Don't hate me guys I'm going to reveal a dark part of my past with this one. When I was a used car dealer in highschool I learned if you had a motor with a rod knock you could ground the outer electrode to the inner on that cylinder and it would have a dead miss but not knock so I could unload it at the auction. So by pulling the plug wire on a rod knock would make it go away or at least quit down not get louder I think your issue requires at least a partial autopsy good luck and sorry for your loss

Sounds like you Liked Used Cars enough to find a lot like in the movie...

 

[pontiacgp]

are you saying when you pull the plug to a cylinder it goes from tapping to knocking?

 

[462cutty]

are you saying when you pull the plug to a cylinder it goes from tapping to knocking?

Exactly!