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SCHSIERRA

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  1. SCHSIERRA
    I can't duplicate the sound while in Neutral, Park, or Drive with my foot on the brake. It's only while driving, although speed doesn't seem to affect it. I think it has a popping, ringing, and tapping sound mixed in one. I think it sounds exhaust related. The ringing noise I can duplicate in neutral going down the road, but once I take the load off the engine, the popping and tapping go away. As you said, QUCKAG, it doesn't sound metallic.
  2. SCHSIERRA
    I have the same noise, and I run 93, always have. I sounds like it's coming from the left side of the engine compartment. It doesn't sound consistent with the engine RPMs so I don't think it's lifters. I also don't think it's injector noise because the more gas I give it the louder it gets but it doesnt change how many ticks it does. Also, I think it only does it while in gear. I drive a 2008 GMC Sierra 1500 W/T 4.8 LY2 with 13,600 miles. Has done it since I can remember. My 4.8 doesn't have Variable Valve Timing or Active Fuel Managment so I don't think either are related.
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