Engine knock when cold
#1
Engine knock when cold
I just picked up this 2000 SS Camaro a week and a half ago.
When engine is cold, it has a noticeable "knock" that sounds like a rod knock. It is definitely NOT a valve tap...it sounds much deeper.
When engine is warmed up, the noise is all but non-existent.
Oil pressure reads 60psi at light throttle cruise
Just shy of 40psi at warm idle
50psi at cold idle.
Original owner said he used Mobil1 only.
Engine has 110,000 miles but runs fantastic.
If you rev the engine up, noise is gone...or at least I cannot hear it then.
I tried SEARCH function here and elsewhere and most engine knocks seem to be when HOT, not when COLD....
Any ideas?
When engine is cold, it has a noticeable "knock" that sounds like a rod knock. It is definitely NOT a valve tap...it sounds much deeper.
When engine is warmed up, the noise is all but non-existent.
Oil pressure reads 60psi at light throttle cruise
Just shy of 40psi at warm idle
50psi at cold idle.
Original owner said he used Mobil1 only.
Engine has 110,000 miles but runs fantastic.
If you rev the engine up, noise is gone...or at least I cannot hear it then.
I tried SEARCH function here and elsewhere and most engine knocks seem to be when HOT, not when COLD....
Any ideas?
#3
#4
Again, normal for LS1s according to GM. Some do it, some don't. Do a search on "piston slap" for TONS more info. And while you're searching, there is a lot of information on engine oils, and why Mobil 1 products (especially as of late) are not optimum for the LS1. Some people have had success quieting the noise with a different oil.
Last edited by Marc 85Z28; 07-06-2007 at 10:54 AM.
#6
Again, normal for LS1s according to GM. Some do it, some don't. Do a search on "piston slap" for TONS more info. And while you're searching, there is a lot of information on engine oils, and why Mobil 1 products (especially as of late) are not optimum for the LS1. Some people have had success quieting the noise with a different oil.
#12
#13
its a perforamnce motor, thicker oil will not hurt it any, im in the road racing scene and we have 2.3L 4cylinders using 15/50 full syn for a couple of seasons they last thats a few years of every weekend running the **** out of these at almost 8grand
#14
..........If you're running a 2.3L 4-banger
#15
And who gives 2 cants for how you abuse a 4 banger?
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