Question about 1999 Chevrolet Silverado 1500

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Knocking sound coming from around the oil pan.

When the truck is under a load (driving down the highway) it makes a knocking sound.. I have ruled out that it isn't a lifter or anything to that nature. You can put the front of the truck up on jack stands and start it, and it makes the sound at idle.. I got up under the truck while it was running and it sounds like the knocking sound is coming from the oil pan area.. It isn't a consistent knock.. sounds more like something broken off and rattling. Any ideas? Thanks

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  • Jerry Koski
    Jerry Koski May 11, 2010

    check a little farther back fly wheel cracked or possably torque converter if its automatic ?

  • Anonymous Mar 15, 2014

    Driving,down,road,an,motor,started,making,a,knocking,sound

  • Anonymous Mar 23, 2014

    lifters rattle when engine is running

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This is a big sign that you might have a spun rod bearing if it's coming form your oil pan. Use a screwdriver and put the flat tip end on the oil pan and the plastic end near your ear like a stethascope and if you hear a knocking it's probaly a spun rod bearing or a bent or warped wrist pin on the bottom of your piston. So some good advice is to not run it anymore until you get it a mechanic to fix it. If you want to do it yourself you have a job ahead of you but refer to an Haynes Auto Repair Manual and you will have fun doing a job by yourself. I hoped this help!

Posted on May 20, 2009

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