v6 Cold idle knocking sound normal?
Is a mild knocking (not injector tick) sound normal on cold idle on the v6 F-Type?
Sound disappears after a few mins: Cold: Piston slap? Opinions / comparisons appreciated for piece of mind |
Does not sound like the common SC coupler / torsion isolator rattle to me, something else methinks, but no idea what it might be.
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If it's any consolation, mine does the same thing. My local dealership replaced the entire SC but it didn't fix it and then said the sound is normal at start-up. It does go away after a few minutes once the engine is warmed up. I'll have them check again in a few months once my car is due for its next service.
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I had a V6 for three years. When cold it sounded like one kind of '32 Ford tractor. When warm it sounded like another kind of '32 Ford tractor. Same as your videos. The supercharger was also noisy under acceleration, particularly in cold temps.
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Thanks for the feedback
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Surprisingly, I seem to have fixed my "knocking while cold" issue. All I did was add a can of BG 44K Platinum to a nearly full tank and the noise nearly disappeared after 50 miles or so. I guess it cleaned whatever was sticking and causing the noise?
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Originally Posted by DanL
(Post 2106937)
Surprisingly, I seem to have fixed my "knocking while cold" issue. All I did was add a can of BG 44K Platinum to a nearly full tank and the noise nearly disappeared after 50 miles or so. I guess it cleaned whatever was sticking and causing the noise?
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I just put some in both vehicles last month as a preventive maintenance step. (thanks Unhinged).
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Update in case it helps people- by chance during a service I discovered the garage putting their stock 0w40 oil instead of the JLR certified Castrol 0w20. I played hell and they changed the oil to the recommended type; to my surprise the engine went quiet, could not believe it.
In short the engine design appears very sensitive to oil. |
Originally Posted by goodfodder
(Post 2214553)
Update in case it helps people- by chance during a service I discovered the garage putting their stock 0w40 oil instead of the JLR certified Castrol 0w20. I played hell and they changed the oil to the recommended type; to my surprise the engine went quiet, could not believe it.
In short the engine design appears very sensitive to oil. |
Originally Posted by Unhingd
(Post 2214581)
ouch. The heavy viscosity must have been messing with the variable cam.
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Originally Posted by Unhingd
(Post 2214581)
ouch. The heavy viscosity must have been messing with the variable cam.
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Originally Posted by Unhingd
(Post 2214581)
ouch. The heavy viscosity must have been messing with the variable cam.
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