Reply To: Fiesta ST180 Symposer Delete Whirling Vacuum Noise So just finished the Symposer Delete on the Fiesta ST180 and now notice that there is a whirling or better described as a Vacuum Noise from blowing across the top…

[UK Sentinel]

After further investigation, actually found the vacuum suction type air noise was caused by the Bosch stock air filter we had put in. Once we re-added the ST180 PiperCross sports air filter, the vacuum sucking type noise was no more.

Note, I also did clean the MAF (mass airflow sensor) at the same time, but either way, no more sucking vacuum type noise .

Thoughts, only reason maybe as to why the Bosch stock (ST180) air filter did not work is because the Fiesta ST180 is fitted with a Milltek CAT back exhaust and this is pulling more air (intake) as a result or the Bosch stock 180 air filter is faulty.

Or the FiST is already remapped stage 1 tuned (software) and we do not realise

In a completely sane world, madness is the only freedom (J.G.Ballard).

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