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1990 K1500 Possilbe Engine Noise

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PostPosted: Thu Nov 05, 2020 6:13 pm    Post subject: 1990 K1500 Possilbe Engine Noise Reply to specific post Reply with quote

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.
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PostPosted: Fri Nov 13, 2020 7:40 pm    Post subject: Re: 1990 K1500 Possilbe Engine Noise Reply to specific post Reply with quote

If you have a wooden dowel around three feet long + or -, place it on different spots on the engine and put your ear to the upper end. You can usually get closer to the place where the noise originates. You can also run the engine while pulling one plug wire at a time (don't get zapped, you may have to shut it off in between). If it's related to one piston, wrist pin or connecting rod bearing it will likely get quiet while not firing on that hole. I had a 350 once that had a knock. It sounded so convincing that a rod bearing would be the trouble spot. We had that engine in and out of vehicles, apart and put together more times than I like to think while all specs were right where they should be. My brother said it's likely a piston slap noise. He said "buy and install off center pistons and the noise will go away", wouldn't you know that cured it! Sometimes it takes a number of tries before the problem is found.
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PostPosted: Sat Apr 03, 2021 3:20 am    Post subject: Re: 1990 K1500 Possilbe Engine Noise Reply to specific post Reply with quote

The 4.3 engine is notorious for piston slap, it will sound like a wrist pin. They seldom cause any problems, just annoying.
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