Clicking Sound from Engine
#1
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Clicking Sound from Engine
Started up the SC 430 (2002) and a clicking noise is coming from the engine. After engine is warmed up noise settles down . Have 71212 miles
#3
Lexus Test Driver
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mrblister got it right. get some valve tap cleaner put in engine oil, see if that helps, then change oil. two things cause a tap, bad lifter or cam and lifters will need to be changed.
if it were me change cam and lifters, do it the right way.
if it were me change cam and lifters, do it the right way.
Last edited by bacardi11; 03-09-14 at 05:10 PM.
#4
Sounds like a little valve train clatter. If you take it to the dealership or a trusted ASE Certified mechanic, they will set the proper valve lash and shim if and where needed on either left or right bank or both. If they are too far out of spec for any adjustment to the valve train, throw a new set of lifters at it and also check the cams as Mrblister and Bacardi have suggested. This will quiet down the "Singer Sewing Machine" effect and get it silenced down and idle creamy smooth again.
#5
Driver School Candidate
All good advice from experienced forum posters. 71,000 miles seems a little low for this type of problem, in this engine. Maybe try the descending order of possible remedies:
1) try tap (lifter) cleaner and oil flush before fitting a new oil filter and new (spec) oil. I know oil flush invites mixed opinions but tap or lifter noise implies a gummy oil nature. Blocked oil galleries will give bigger problems.
2) a trusted mechanic adjusts the cam clearances
3) replace parts
1) try tap (lifter) cleaner and oil flush before fitting a new oil filter and new (spec) oil. I know oil flush invites mixed opinions but tap or lifter noise implies a gummy oil nature. Blocked oil galleries will give bigger problems.
2) a trusted mechanic adjusts the cam clearances
3) replace parts
#6
These are hydraulic lifters, right? If so a cleaner and then new synthetic oil might help. I had an Audi Turbo Quattro back in the late 80's that had one lifter that took some time to pump up starting around 80kmiles. Switched to synthetic oil and it pumped up in a few seconds. I put 250,000 miles on that engine before I gave it to my brother, and he put a bunch more on it until the tranny let go.
If the clatter goes away once the engine is warm, I wouldn't necessarily tear it down as a first step. And in fact, loose for a few minutes ain't all bad, unless it sounds like a diesel engine.
If the clatter goes away once the engine is warm, I wouldn't necessarily tear it down as a first step. And in fact, loose for a few minutes ain't all bad, unless it sounds like a diesel engine.
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