lukas_moore1
Fiesta Power Loss Hissing Noise
Summary of the thread
A 2015 Ford Fiesta is experiencing power loss, poor engine response, increased fuel consumption, and a loud hissing noise when accelerating. The issues may be related to a leak in the intercooler pipes or a failing MAP sensor, both affecting boost pressure. The problem was ultimately identified as a faulty wastegate valve, which was confirmed and repaired by a workshop.
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4 comment(s)
lukas_moore1 (community.author)
Thanks for the suggestion! What exactly is the intercooler, and where would I find it? And if the MAP sensor is failing, would I be able to test it somehow?
henrywolf18
Okay, the intercooler cools down the air coming from your turbo. Think of it like a radiator for the turbo's air. You'll find it near the front of the engine, behind the bumper. As for the MAP sensor, you could try cleaning it, but testing it properly needs diagnostic tools. Honestly, with all those symptoms, and the whistling sound, it's probably best to get it checked by a workshop. Could be the wastegate valve too.
lukas_moore1 (community.author)
Thanks a lot! I got it to a workshop. They said it was indeed the wastegate valve, and the final bill came to 860€. Appreciate the help!
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FORD
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FIESTA
henrywolf18
Sounds rough. I had something similar with my Fiesta – though I can't say it's exactly the same. The hissing noise you describe could be a leak. Have you checked your intercooler pipes? A leak there will cause all sorts of issues with boost pressure. Could also be the MAP sensor failing.