kiwishau

I have a serious hissing sound on left front of the engine (3.9 6cyl) approximately around the distributor. It is a constant hiss very loud and does not change with revs.
Have checked all pipes but cannot find it.
Have taken the air filter off held my hand over the intake and the hiss is still there. Holding my hand over the intake does not cause the engine to stall which means it is getting air froom somewhere else.
Have removed and cleaned the ISC, checked the breather pipes and all appears to be ok.

Any suggestions or ideas on what it is

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edv8wagon

Inlet manifold gasket... Acurately spray some Aerostart around to confifm.

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edv8wagon

Inlet manifold gasket... Acurately spray some Aerostart around to confirm.

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My tag line sucks, can I borrow yours?

outback_ute

If it is the gasket as suggested (highly likely) it should change note when the engine is under load (and when revs vary to some degree). Ironically mine is doing the same right now.

kiwishau

Yep inlet manifold gasket. Front cylinder gasket in particular. What an absolute bugger to fix. Big hands small spaces but got there in the end. Thanks for the advice.

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