williamschulz5
Laguna Hissing and Fuel Consumption
Summary of the thread
A 2011 Renault Laguna is experiencing higher fuel consumption, a check engine light, and a loud hissing noise when accelerating. These symptoms suggest a potential leak in the air intake system, likely a cracked intake hose. Checking and replacing the intake hose resolved the issues, restoring the vehicle's performance.
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4 comment(s)
williamschulz5 (community.author)
Intake hose... where exactly should I be looking? Is it easy to spot, or do I need to remove the air filter first?
richardghost6
Yeah, start by checking the vacuum hose and the air filter connections. If you're not comfortable doing it yourself, a workshop should be able to run a leak detection test pretty quickly. It's probably a cracked intake hose.
williamschulz5 (community.author)
Thanks. Turns out you were spot on - intake hose leaking. Replaced it for 100€. Runs like new!
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RENAULT
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LAGUNA
richardghost6
Sounds familiar. Had similar symptoms on my old Saab 9-3. Did you check the intake hose for cracks? A leak there would explain the hissing and the engine misfire.