FeliXX
Nissan Dayz Air Valve Hose Issue
Summary of the thread
A 2006 Nissan Dayz with a gasoline engine experienced a check engine light issue, suspected to be related to the air valve system, likely due to a faulty hose. The problem was identified as a vacuum leak, causing rough idling. The solution involved inspecting hoses for cracks or disconnections, particularly near the air intake and valve. The issue was resolved by replacing a cracked hose on the air valve, resulting in the check engine light turning off and the vehicle running smoothly again.
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4 comment(s)
FeliXX (community.author)
Thanks, yes, it is idling rough. I'm thinking about getting an OBD2 scanner. Where on the vacuum hoses should I look closely? Any common weak spots to watch out for?
hannahblitz2
Rough idle plus the light definitely points to a vacuum leak. Focus on hoses near the air intake and valve. Check connections to the intake manifold too. Since it's an older car, those hoses get brittle from age and heat, causing leaks. If you find a crack, a pro might be needed, could be more going on.
FeliXX (community.author)
Good news: It was a cracked hose on the air valve, just like you said. The local shop replaced it. Cost me 175€. The check engine light is off, and it runs smoothly now.
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NISSAN
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DAYZ
hannahblitz2
Sounds like a vacuum leak. Like a pinhole in a water pipe causing pressure drop, vacuum leaks mess with the air-fuel mix. Is it idling rough? If you have an OBD2 scanner, check the error code. Have you looked at the hoses for cracks or disconnections?