Knock at idle

[frodiesel]

Before you do this, remove the AC belt first. I'm having the same issue, but the noise is a bit more noticeable when the compressor is on. I removed the belt and dead silence. This pinpointed the AC being the culprit at least. My idler pulley has a bit of a click to it when free spinning (it should be dead silent). The idler pulley only costs about $20 vs a few hundred for the crankshaft pulley. Even if your compressor is shot, a reman can be had for around $100 from eBay with warranty.

Will do. Hope i have time this weekend. Thx.

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[Trojan4x4]

Thread revival as I have exhast same symptoms as OP

 

[Airshowpilot]

Just fixed this exact issue today

Mine was doing exact thing, thought it was my flex plate, turns out my torque converter bolts had slightly loosened.

 

[Bwarn]

I just had this problem on my 1999 4Runner SR5 2wd v6. At least I’m pretty sure. It knocked pretty significantly in idle/gear but stopped in park. The shaking would ease as I sped up a little but not completely. My air filter was very dirty , luckily I was one block from auto zone so I replaced the air filter and it runs better than it ever has since I bought it a year and half ago and the bad shaking has completely stopped. But I’m not sure if knocking and shaking are the same. Mine wasn’t a sound but a physical shaking. My mind is blown at how simple of a thing had such a dramatic effect on the vehicle. Thanks so much to the forum , I really needed a win today, plus I was on my way to get a friend off the side of the road broke down when the shaking began !

 

[azbhoff]

2002 sport, V6, 190k. When engine is warm, in gear at idle it makes a knocking sound. Put it in park or N and knocking goes away. Rev engine or while driving, no noise. Only in drive or reverse at idle when warm. Any suggestions?
Thanks

Mine does this exact same thing and I am at 150K. Going to have it looked at this Saturday.[/QUOTE]

Reviving this thread. Did you ever learn anything about your knock? I have the EXACT same symptoms. Thanks