gertstern7
Insignia Hissing Noise and Fuel Consumption
Summary of the thread
A 2008 Vauxhall Insignia owner reported increased fuel consumption, an intermittent check engine light, and a loud hissing noise during acceleration. These symptoms suggested a potential air intake leak. A responder advised checking the air filter and intake hose, as a vacuum leak in these areas could cause such issues. The owner later confirmed that a leaking intake hose was the problem, which was resolved by replacing it.
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4 comment(s)
gertstern7 (community.author)
Thanks for your reply. I haven't checked the intake hose specifically yet. Where exactly should I be looking for the leak, and what is the likelihood of it being the intake manifold itself?
gertschwarz51
While it is plausible the intake manifold gasket could be the source, the intake hose is the likelier culprit, given the age of the vehicle. I suggest having a qualified technician examine the entire intake tract for integrity.
gertstern7 (community.author)
Understood. I appreciate your advice. I'll get it checked out by a technician. It turned out to be a leaking intake hose, which cost 100€ to replace. Thanks again!
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VAUXHALL
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INSIGNIA
gertschwarz51
A hissing sound combined with those symptoms certainly points to a vacuum leak in the intake system. Have you checked the air filter and the large intake hose that connects to the throttle body? A crack there would definitely cause these issues.