My car is still sounding like theres a tapping or like a diesel, but only when cold. Plus when i start the car when the engine is cold the revs hit 2000rpm stay there for about 2 secs and drop.. and during the time it revs when it starts up there is a loud tapping or sounding like a van.
However when i turned the car off, i waited a few seconds, re started it while still warm but it only hits 1000rpm then idles just around there and there is hardly any tapping on startup when warm, literally barely anything!
Why is it doing it when cold?? What are these symptoms