97 12 valve DRW auto. I removed belt suspecting idler tensioner, not so. Ran engine sans belt & noise stil there, kind of a screching noise. Could not pin it down with a stethascope. Using a heater hose to ear dosent help. My ears point to exaust manifold area near front of engine. Could KDP pin have fell out & be grinding on timing gear? Front case looks ok- no oil leaks. This has me stumped. Would appreciate some advice. Thanks BOB ALLER