What is this called and what is it for

Tiny
MGSIL
  • MEMBER
  • 2001 NISSAN MAXIMA
  • 190,000 MILES
I recently replaces this original hose with a cut to fit hose because the old one was cracked. What is this hose for and what is it called? Right now the hose has a bend in it and wondering it it will cause any damage. It connects from the air intake to the valve cover.
Friday, May 8th, 2020 AT 2:59 PM

4 Replies

Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

That is called the PCV (positive crankcase ventilation) hose. It takes the gases and fumes that pass by the combustion process and send those gases back through the intake manifold assembly to the engine to be re-burnt. This is done for reduced air pollution into the environment. Only gases and fumes pass through the hose (no liquids) So if there is a minor kink I so no damage being done. Just try your best to get the kink out and you'll be okay. Hope this helps and thanks for using 2CarPros.
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Friday, May 8th, 2020 AT 3:35 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This is should have a valve on the end closest to the valve cover. It is called the PCV (positive crankcase ventilation) valve. Basically it allows gases that are produced by the engine to be reused by the engine and not omitted to the atmosphere.

However, that line does look pretty thick so I just want to make sure you still have a PCV installed in the line. Basically it is a check valve and only allows gases out and not back in the engine. If they come back in, it can cause performance issues.
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Friday, May 8th, 2020 AT 3:40 PM
Tiny
MGSIL
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The original one did not have a valve it was just a hose.
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Friday, May 8th, 2020 AT 3:49 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,576 POSTS
Then you are looking at the fresh air side of the system. One hose comes from the air cleaner to the inlet, then on the other valve cover will be the valve and hose that takes the air out and to the intake to burn off any of the gasses that are in the engine crankcase.
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Friday, May 8th, 2020 AT 4:44 PM

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