bytor
Well-Known Member
Looking for some insight from L98 owners. I have developed a ‘tick’ in my engine that I’m starting to think its lifter related. The tick can’t be heard until the engine is warmed up. After about 3-5 minutes of running, you can hear the tick. It only does it at idle. Sometimes when sitting at idle the tick will go away for a few seconds and come back. The car runs perfect and Idles smooth, with no power loss. I have checked all the usual suspects like flex plate cracked, loose torque converter bolts, exhaust leaks and so on. The only area I can hear the tick is on the #7 exhaust port area on the manifold. This leads me to think the #7 exhaust lifter may be leaking down and causing some valve slap.
The service manual offer a few diagnosis that describes the symptom accurately I think.
1. Intermittently Noisy On Idle Only. Disappearing When Engine Speed is Increased:
Intermittent clicking may be an indication of a pitted check valve ball, or it may be caused by dirt.
Correction: Clean the lifter and inspect. If check valve ball is defective replace lifter.
2. Noisy At Slow Idle or With Hot Oil, Quiet With Cold Oil or As Engine Speed is Increased:
High leak down rate. Replace suspect lifter
Before I yank the intake off to check things out I was curious if any other L98 owners experienced this type of noise and if a lifter was the culprit?
The service manual offer a few diagnosis that describes the symptom accurately I think.
1. Intermittently Noisy On Idle Only. Disappearing When Engine Speed is Increased:
Intermittent clicking may be an indication of a pitted check valve ball, or it may be caused by dirt.
Correction: Clean the lifter and inspect. If check valve ball is defective replace lifter.
2. Noisy At Slow Idle or With Hot Oil, Quiet With Cold Oil or As Engine Speed is Increased:
High leak down rate. Replace suspect lifter
Before I yank the intake off to check things out I was curious if any other L98 owners experienced this type of noise and if a lifter was the culprit?