Altima welcome?

[DDragon]

Hi all, 

I am the third owner of my 1994 Nissan Altima. I'm looking to get some help and advice on repairs that it needs. Can somebody point me in the right direction to which forum I would use I don't really see a Nissan Altima forum. 

Alternatively I could just say what's wrong with it here. 

I need to swap out the knock sensor and I'm not really sure how to get to it. If anybody knows the procedure I would be grateful. 

The knock sensor is behind the engine below the intake manifold.