March 2020: In search of the cause.
Faulty air filter should be 90% the cause of a dirty throttle body. 10% can be leak in box or plumbing.
The thing every Fiesta owner/mechanic hate, unscrewing the air filter bolts. Removing the box is another headache.
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Tadaa
Removed all of them in a minute (or maybe 2
)
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The cause, wrong filter
I expected rat attack.
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There was gap in both sides of the filter.
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The filter was pretty clean for 10k km of use, meaning air flow was minimal through the filter.
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If belongs to Opel Corsa and costed more than twice the Ford OEM filter. Done by Travancore Motors. See the folds in the filter as well. It didn't fit inside the box, they squeezed it in.
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Next was overtightening the bolts, causing them to sink too much.
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and puncturing through the cover.
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Added washers to prevent further damage.
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All cleaned and installed back. Managed to install the filter without any gap, but still risky. Would get stock filter as soon as the Ford service center are up.
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