Duramax Diesel Warm Engine Idle Knock Sound. Constant at idle (warm or cold). Ain’t technology grand? However, there are situations where the engine makes a strange ticking noise when it is idle and accelerating. This oil additive allegedly contains graphite, which helps some internal components in the engine seat better (though they likely would have seated over time anyway). Normally, the engine will barely make any sounds as it runs. 76 Posts . Sounds like its in the valve train. The tick is so faint that I wasn't even really able to catch it on video. The noise is usually more noticeable when the engine is warm. It sounds the same as before when the engine is cold, it only ticks at idle when warm, if i rev it up to even 1100 rpm the ticking goes away. After letting the car idle with the additive in it, the noise was gone. Discussion Starter • #1 • Aug 31, 2010. Cidsamuth’s Mustang now has 3,200 miles on it and the ticking has not returned. With all the moving components inside the engine, you may wonder which one of them is causing these noises to occur. No codes at all (I have a VAG-COM cable)-Power feels on point ... Makes the noice whether the car is moving, stopped, in or out of gear when the engine is at idle speed. It sounds like a lifter to me but i'm not sure. Someone else said it sounded a bit like a relatively quiet Diesel engine. Symptom: The engine knocks or ticks at idle. The car runs fine and pulls great. The noise may be described as “ticks,” “taps,” “knocks” or “thumps.” in some cases the noise may be a normal characteristic of these engines. In all cases, the car runs just fine...and that's … The '03 S430 has a slight ticking noise which you can hear at idle, but only after the engine gets warm. There have been complaints that some Ford vehicles equipped with a 4.6L 3-valve or 5.4L 3-valve engine may exhibit a ticking and/or knocking noise after reaching normal operating temperature. Goes away when you bring rpms up from idle. Of course something like this concerns me. The ticking is constant at idle, but speeds up with acceleration. Parts Information: Flange Bolt (Use … April 15, 2020 Some 2020-2021 Silverado 2500HD/3500HD and Sierra 2500HD/3500HD trucks equipped with the 6.6L Duramax diesel engine (RPO L5P) may have a thumping or knocking sound coming from the rear of the engine. Engine smoother but no change in ticking at warm idle. It does not tick at all when cold, and it doesn't tick while driving, only when stopped and warm. My 2005 Passat TDI recently started ticking at idle when the engine is warm. Started ticking recently. Was hoping it would help.-Burns 1qt oil every 2.5k mi-Coils/plugs changed 1k mi ago-Engine runs well. 2012 silverado 5.3 13,000 miles. Hi guys, I recently noticed that my engine is faintly ticking at warm idle. Probable Cause: The rocker shaft bridge has excessive clearance, which causes the rocker shaft to rotate and make noise. 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