Ok,
I think i realize why my 2002 Ford Taurus DOHC has been running rich. I believe i may have a vacume leak some where. I hear a slight hissing but i am not sure if it is air being pulled through the upper intake manifold, or if there is a gasket that didnt properlly seal, or if a hose has a slight crack in it.
Normally, is there a slight hissing sound coming through the intake manifold, or does that mean that a gasket did not seal properly? I had a friend preform a tune up last summer and we had to remove the upper to get to the back plugs.
I think i realize why my 2002 Ford Taurus DOHC has been running rich. I believe i may have a vacume leak some where. I hear a slight hissing but i am not sure if it is air being pulled through the upper intake manifold, or if there is a gasket that didnt properlly seal, or if a hose has a slight crack in it.
Normally, is there a slight hissing sound coming through the intake manifold, or does that mean that a gasket did not seal properly? I had a friend preform a tune up last summer and we had to remove the upper to get to the back plugs.