hello

I have noticed when staying in traffic that the rpm gauge doesn't stay at the 3rd line of rpm but goes up 1 line( rpm ) or drops. Why does this happen ? Carbon residue on the manifold, bad petrol , bad plugs or maf sensor ?

thanks

 

Checks if you have boost leak

 

Maybe because boost goes only up to 0.4 bar-0.5 bar. The car now has hesitation and strange shake from engine. It has 60k km with oem original plugs. My first step will be raplacing them with bosch oem plugs and than after I upgrade the turbochargers will clean maff sensor ,manifold carbon risidue and check for leaks .

 

Very nice , but with upgrade , use Denso . They are awesome.