Where is the pcv hose in a Mazda 6?

Answer 1

it is located underneath the inlet manifold

It actually depends on whether you are talking about Mazda 6i (4 cylinder engine) or 6s (6 cylinder). I own 6i and it is located under the intake manifold and you can't reach unless you remove the manifold first. For 6s the PCV hose is behind the engine close to the firewall.

Correction: You can change the pcv hose on a 2.3L without removing the manifold. You can get to it from underneath and it connects at bottom back of manifold and at the top. Look through the space on right of manifold in front top and you will see it. You''ll need lighting and flashlight possibly to see it as it is in a hard to get place. The ends of the hose are offset 90 degrees. Unbolt the starter and move out of your way. I also took off the throttle body and hose, the two shuttle valves also. Then you can stand in front and reach underneath to attach the top part of the hose on the nipple. The nipple is made out of nylon so don't break it, after its on work your clamp into place. I had to take the insulating cover off and clamp the top first then put the cover back on. You''ll have to lay underneath to clamp the bottom connection. I jacked the front side up and used a stand as added safety. Just jack it enough to get under. The top connection is a hassle and you may need to pry it with a large screwdriver just don't break the nipple. Lube the hose and nipple first. The old hose had a 2 inch slit/crack in it. It caused the car to idle rough/stall and shift hard from 1st to 2nd. After replacing hose the car runs great. It has 80k on it. Bad engineering to replace a $15 hose that is so critical to the emission system. This job is for shadetree mechanics that like to do this stuff and have some knowledge of auto mechanics etc.