Tapping or knocking?
- If noise is higher pitching tapping, your likely to find:
- Stuck Lifter
- Loose Rocker Arms
- Clogged oil passage in the rod
- worn Cam lobes
- Lower pitch knocking
- crank bearings
- If noise is in the back and around the transmission, check for cracked Flexplate
- 2001 Jeep Grand Cherokee Engine Noise (4.0L) - EricTheCarGuy
- has tips on how to RnR Valve Cover
- checking oil delivery
- tightening rockers
Additional suggestions or experience?