Hello to you all,
I need some help, there are some issues on my car and I'm very carefull with it. They were mentioned on the normal maintenance (toyota dealership) and nothing has been found...
With the car already warm, I hear a knocking on the engine (like a tu, tu, tu....) when I remove my foot off the accelerator with the gear engaged (normally 4th or 5th). Pressing the clutch and releasing it after a few seconds makes the noise disappears. This is normal? I do not know much about mechanics, could be it unburned fuel or exhaust gas that does not come out properly ...? It seems to be easier to ear if the aceleration given before is strong...
It is also normal to have an acceleration range, near 80 or 90 km/h in fifth gear, where the engine vibrates for a few seconds...?
The car has strength, works right, starts always at first, it goes perfectly well and it never turned on the engine light.
I do short trips during the week, except at the weekend, and sometimes the filter regeneration process kicks in.
Could it be the DPF or the EGR? It only has 40.000km...
Thank you for your help.