paul_smith1
Ford FiveHundred Hissing Noise Air Leak
Summary of the thread
A 2006 Ford FiveHundred is experiencing decreased fuel economy, a check engine light, and a loud hissing noise when accelerating, suggesting a possible air intake system leak. The hissing noise, which intensifies with engine revs, indicates a potential air leak that could disrupt the air-fuel mixture, causing lean conditions and possibly engine misfires. The recommended solution is to inspect the air intake system, focusing on hoses and connections, and perform a smoke test to identify leaks. A workshop confirmed a leaking intake hose, which was repaired.
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4 comment(s)
paul_smith1 (community.author)
The hissing sound intensifies proportionally with the engine's revolutions. Is it plausible that such a leak could also induce engine misfires, or are there typically other symptoms associated with that?
antoniawolf90
Yes, it's absolutely plausible that an air leak can cause engine misfires. The unmetered air disrupts the air-fuel mixture, potentially leading to lean conditions. If the hissing gets louder with revs, it's likely a decent sized leak. Given the car's age and mileage, it might be best to have a workshop inspect the entire intake system thoroughly. They'll have the tools to perform a smoke test, which can pinpoint even the smallest leaks. It could be more than just a hose.
paul_smith1 (community.author)
I took the advice and had a workshop conduct a smoke test. It was indeed a leaking intake hose. The repair cost came to 100€.
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FORD
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FIVEHUNDRED
antoniawolf90
Sounds familiar. I had a similar experience with my 2014 Opel Insignia, also a gasoline engine. The fuel consumption and hissing noise point strongly towards an air leak. Inspect all the hoses and connections in the air intake system, from the air filter box to the throttle body and intake manifold. A cracked or poorly sealed hose can cause unmetered air to enter the engine, messing with the air-fuel ratio and triggering the check engine light. Does the hissing sound get louder as the engine revs increase?