strange engine noise in a 6.0

By bperk6268
April 24, 2015 in 1999-2013 Silverado 1500 & Sierra 1500

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bperk6268

Posted April 24, 2015

I have a 02 gmc 1500HD with a 6.0, I have noticed a strange noise that sounds like its coming from in the engine right under the intake, but thats a guess for now... but the noise sounds like some kind of little electric pump coming on and off, it comes on about every 20-30 seconds and stays on for about 10 seconds... it doesnt change if i rev the engine at all, so its seperate from any of the RPM stuff. but you can hear it in the truck at an idle and its like clock work all the time...

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