pia_schubert80
Peugeot 301 Hissing Sound on Acceleration
Summary of the thread
A 2019 Peugeot 301 with a gasoline engine is experiencing increased fuel consumption, a check engine light, and a hissing sound during acceleration. The problem is suspected to be an air intake leak, possibly in the intake manifold or vacuum hose. It is suggested to inspect the intake hose for cracks or wear, and a workshop visit for a smoke test is recommended to accurately locate the leak. The issue was confirmed to be a faulty intake hose, which was replaced, resolving the problem.
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4 comment(s)
pia_schubert80 (community.author)
The hissing gets louder as I accelerate, especially when the engine is under load. I had a quick look and the air filter box seems fine, but I haven't checked the intake hoses thoroughly. Which vacuum hose did you have problems with?
lukasdrache1
Okay, that is exactly what happened to me. I suggest you inspect the intake hose first. In my case, it was cracked and worn. To be honest, it is hard to find the exact spot without proper equipment. It's probably best to visit a workshop to get it checked. They can smoke test it to find the leak. Good luck!
pia_schubert80 (community.author)
I'll get it to a workshop as soon as I can. Sounds like it's probably the intake hose as I suspected. I'll post what happens. It was the intake hose! Replaced and runs like new. Cost me 100€.
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PEUGEOT
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301
lukasdrache1
I know this issue, something similar happened to my Opel Astra. The higher fuel consumption and the check engine indicator are typical when there is a vacuum leak in the intake manifold. I would also check the vacuum hose. Was the hissing sound present all the time or does it get louder with the engine revving?