954 Cold start ticking/clicking
Can anyone tell me exactly what the cause of this is?
Upon starting the engine when it's cold, there is an audible ticking/clickety-clacking coming from the engine top-end area. At first I thought it was the injectors ticking, but it goes away after about 1:30-2:00 of idling.
The fact that it takes about 2 min to go away tells me it shouldn't be the valvetrain being starved of oil, as it only takes a few seconds for the oil to circulate through the engine.
I just switched to Amsoil 20w50 full synth oil but it also did that with the Rotella T oil the previous owner used.
Now, once the ticking stops, it runs and pulls normally.
Could it be that the valves need adjustment (it only has 7100 miles on it), and that once they warm up and expand, they don't clack?
Could it actually be the injectors pushing more than normal fuel through to richen up the mixture for the cold engine, that's causing the temporary ticking?