Date registered: May 2005
Vehicle: '07 GL320CDI
Mentioned: 0 Post(s)
Quoted: 2 Post(s)
Cold engine requires a richer than usual fuel mixture to run properly.
On yours, this is accomplished via temperature sensor and computer which activate cold start injector and idle control valve.
Vacuum leaks indeed defeat the purpose--doesn't matter what function of any line is, it must be connected and not leaking. This is indeed first thing to fix. NOTHING there is something that is not needed nor something that doesn't matter.