Engine making a knocking sound
#1
Engine making a knocking sound
Hey I was wondering if any of you guys knew what this sound might be? It sounds like lifters knocking but I don't think that's it. It only makes the sound after the rev drop under 2k rpm and as it drops from higher revs and idle. I've run synthetic in her since I bought her at 41k and she has 125k now. Last oil change I ran a can of chemtool through the crank and run her for 200 miles then changed the oil again with a 40 weight. Still the same, no change at all. So I changed the oil to a 5 weight to see if the lower viscosity would "degunk" whatever was the cause, still no change. I asked a mechanic friend of mine and he said it sounded like it was coming from the bottom end of the motor. Any ideas would be helpful please.
Thanks!
Thanks!
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