Walt Barie did pass the time by typing:
> On my 93 GC with the 4.0L engine I also had a loud whistle from that
> area and it was the short rubber hose (4") between the plastic pipe
> coming from the PCV valve and the intake manifold. The hose on mine was
> pretty soft and it would collapse under vacuum and when cold. The
> whistle would go away if I moved the hose even slightly. I don't know
> why it only happened in cold weather, I would expect the hose to be
> stiffer due to the cold weather. I replaced it with a new hose and
> haven't had the whistle since. If I recall I had to find the right type
> hose since fuel line type of hose was too stiff. It took a few trips to
> parts stores find the correct vacuum type hose.

Actually it's a CCV, not PCV and the whole assembly is only about
12$ from the dealer. I've got the plastic hardline here, on mine
the rubber adapter is what gave way.

--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

Walt Barie did pass the time by typing:
> On my 93 GC with the 4.0L engine I also had a loud whistle from that
> area and it was the short rubber hose (4") between the plastic pipe
> coming from the PCV valve and the intake manifold. The hose on mine was
> pretty soft and it would collapse under vacuum and when cold. The
> whistle would go away if I moved the hose even slightly. I don't know
> why it only happened in cold weather, I would expect the hose to be
> stiffer due to the cold weather. I replaced it with a new hose and
> haven't had the whistle since. If I recall I had to find the right type
> hose since fuel line type of hose was too stiff. It took a few trips to
> parts stores find the correct vacuum type hose.

Actually it's a CCV, not PCV and the whole assembly is only about
12$ from the dealer. I've got the plastic hardline here, on mine
the rubber adapter is what gave way.

--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!

 

Walt Barie did pass the time by typing:
> On my 93 GC with the 4.0L engine I also had a loud whistle from that
> area and it was the short rubber hose (4") between the plastic pipe
> coming from the PCV valve and the intake manifold. The hose on mine was
> pretty soft and it would collapse under vacuum and when cold. The
> whistle would go away if I moved the hose even slightly. I don't know
> why it only happened in cold weather, I would expect the hose to be
> stiffer due to the cold weather. I replaced it with a new hose and
> haven't had the whistle since. If I recall I had to find the right type
> hose since fuel line type of hose was too stiff. It took a few trips to
> parts stores find the correct vacuum type hose.

Actually it's a CCV, not PCV and the whole assembly is only about
12$ from the dealer. I've got the plastic hardline here, on mine
the rubber adapter is what gave way.

--
-- DougW -- 93 ZJ 4.0 http://members.***.net/wilsond
HESCO Supercharger - 300W IASCA Stereo - Edelbrock IAS Shocks
Gibson Exhaust - rear DCpower - custom gauge install - Stillen Rotors
Banks Header - and BEER, in the fridge!