Posted by chadd on September 07, 2007 at 06:35:54 from (155.92.33.238):
We have a 1993 Chevy 1500 with the 4.3L V6. We bought the vehicle about 5 or 6 months ago and recently, it has begun to make a loud tapping noise. It goes away when coasting and gets louder with an increase in load on the motor (like when accelerating). I have no idea what type of oil it has in it, as I haven't changed it yet (although I am guessing 5w30 or 10w30). I noticed that the valves are not supposed to be adjusted, so I am assuming it must have hydraulic lifters. Could this be caused by a damaged or plugged lifter? Assuming it is, how bad is it for the engine to be run this way (we are planning on doing some towing with it this winter)? Is there any way to troubleshoot them? Lastly, is the only way to remove them to remove the entire intake manifold and the plate underneath it; or can they be pulled out through the pushrod hole in the head? Thanks for any info.
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