marcmsj
15+ Year Contributor
- 1,414
- 14
- Dec 20, 2004
-
Laurel,
Maryland
To make a long story short, started up car one day and there was a loud tapping coming from the head that would increase frequency with engine rev but wouldn't get louder.
Compression and leakdown tests came back good, also had good oil pressure. No apparent loss of power, just sounded like a diesel. Nothing seemed odd in the valve train so figured collapsed lifters.
Changed lifters and problem was solved... for about 48 hours. Then same noise came back. We suspected collapsed lifters but why would it be doing it again with a new set of lifters?
Any ideas on what to test? Again, we have good oil pressure and flow to the head.
Compression and leakdown tests came back good, also had good oil pressure. No apparent loss of power, just sounded like a diesel. Nothing seemed odd in the valve train so figured collapsed lifters.
Changed lifters and problem was solved... for about 48 hours. Then same noise came back. We suspected collapsed lifters but why would it be doing it again with a new set of lifters?
Any ideas on what to test? Again, we have good oil pressure and flow to the head.