76 Posts . 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. Discussion Starter • #1 • Aug 31, 2010. Sounds like its in the valve train. Hi guys, I recently noticed that my engine is faintly ticking at warm idle. After letting the car idle with the additive in it, the noise was gone. Symptom: The engine knocks or ticks at idle. My 2005 Passat TDI recently started ticking at idle when the engine is warm. The car runs and drives like normal. Engine smoother but no change in ticking at warm idle. Constant at idle (warm or cold). The noise is usually more noticeable when the engine is warm. The ticking is constant at idle, but speeds up with acceleration. The '03 S430 has a slight ticking noise which you can hear at idle, but only after the engine gets warm. Started ticking recently. Goes away when you bring rpms up from idle. It sounds like a lifter to me but i'm not sure. In all cases, the car runs just fine...and that's … Someone else said it sounded a bit like a relatively quiet Diesel engine. I've got a high mileage (85K) '99 996 C2 that has recently developed a pretty noticeable engine tick that actually seems to get a little louder when the engine gets warm, and it doesn't go away. Probable Cause: The rocker shaft bridge has excessive clearance, which causes the rocker shaft to rotate and make noise. Normally, the engine will barely make any sounds as it runs. Of course something like this concerns me. When cold, you don't hear it at all. Ain’t technology grand? The tick is so faint that I wasn't even really able to catch it on video. 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. 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). Was hoping it would help.-Burns 1qt oil every 2.5k mi-Coils/plugs changed 1k mi ago-Engine runs well. Duramax Diesel Warm Engine Idle Knock Sound. 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. With all the moving components inside the engine, you may wonder which one of them is causing these noises to occur. The noise may be described as “ticks,” “taps,” “knocks” or “thumps.” in some cases the noise may be a normal characteristic of these engines. Parts Information: Flange Bolt (Use … It does not tick at all when cold, and it doesn't tick while driving, only when stopped and warm. 2012 silverado 5.3 13,000 miles. The car runs fine and pulls great. 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