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Took my plow truck to town today to get gas. Heard something vibrating on the way there and back from time to time. When I got home I left the truck idling and opened the hood. Turned out the rattling was the plow lights old and decrypt. But then I noticed what was either an engine knock or or something loose and moving and making a knocking sound. Went to the drivers side and raised the engine rpms and the noise went away, let it idle back down and the noise came back. Nonie seems to go away above idle. Had no problem with power or dive-ability on my way to and from town. Will check it out more tomorrow, my current health condition makes long standing or working difficult and painful. Checked oil it was clean and full and oil pressure was good. Noise seemed like it might have been a little louder on the passenger side. This is the 4.3l engine.
Thanks for any and all info.
Bill
 

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I am giving you a semi educated guess. If its knocking get a mechanic to give it a look.
If you have to use it, ok. But if it gets louder, stop.
 
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