jannik_dragon3
Seat Altea Fuel Economy and Hissing Sound
Summary of the thread
A 2009 Seat Altea owner experienced a significant drop in fuel economy, a persistent check engine light, and a hissing sound during acceleration. These issues were suspected to be caused by an air intake leak, which can lead to engine misfires and other problems. A fellow owner suggested checking the air intake hoses, particularly the one connected to the throttle body, as a leak there could cause these symptoms. The problem was confirmed to be a split in the intake hose, and after replacement, the vehicle's performance returned to normal.
Did this summary help you solve your problem?
4 comment(s)
jannik_dragon3 (community.author)
Thanks for the tip. How did you pinpoint the exact location of the leak? I've visually inspected the hoses, but I can't see any obvious cracks or damage.
franziskahimmel6
Yes, the symptoms align. I did a smoke test for leak detection, but eventually took it to a workshop. They confirmed it was a split in the intake hose, causing unmetered air to enter the engine. This affects the fuel-air mixture. I suggest taking it to a professional.
jannik_dragon3 (community.author)
You were right; it was an air intake hose. The mechanic found the leak fast. Cost me around 100€ for the hose and labor. Fuel economy is back to normal, and the hissing is gone. Thanks for the help!
rmh_community_comment_box_header
community_crosslink_scanner_headline
community_crosslink_scanner_intro
community_crosslink_scanner_title
community_crosslink_scanner_price
community_crosslink_rmh_headline
community_crosslink_rmh_intro
community_crosslink_rmh_title
community_crosslink_rmh_subtitle
community_crosslink_rmh_brand
SEAT
community_crosslink_rmh_model
ALTEA
franziskahimmel6
I had a similar issue with my Altea some time ago. Check the air intake hoses, especially the one connected to the throttle body. A leak there can cause a hissing sound, increased fuel consumption, and even trigger the check engine light. Think of it like a punctured tire; the engine has to work harder to maintain pressure.