05 mercury marinara hard to start hot or cold

Question

05 mercury marinara 3.0 v6 hard to start hot or cold revs high then idles down drives good still all power every thing still just a lil high in rpms and hear a vacuum like sound on back side of motor but every things conected is it intake gasket or sensor

Answer 1

HI there

A decent way to locate vacuum leaks is to spray some starting fluid or carb cleaner around where you hear the noise. If it's a vacuum leak the engine speed will increase or smooth out. If that proves no vacuum leak, then you should check the fuel pressure, this could cause the hard starting.