Wondering if anyone out there would know the symptoms of leaking air intake or manifold on a petrol model?
Reason for asking is since I had lpg fitted there is a strange, fairly quiet sucking noise behind the passenger seat between 1500 and 2000rpm.
Now it could just be my imagination, normal or the flashlube system but I wanted to be sure there wasn't something amiss.
I;m going back to the LPG guys next week to have the 1000 mile check up. They are very helpful and the look of their installation is very neat so if there is anything amiss I'm sure they will sort it out but I just wanted to known what this sucking noise could be (other than me just getting old an stupid

BTW does anyone know if the petrol V6 has electronic ignition.
Thanks guys.