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Ultrasonic cleaning of intake manifold
I send my intake manifold to a nearby cleaning facility for utrasonic cleaning. The charge cost was $150. As instructed in the SIB, I removed all seals, fasteners, swirl flap actuator and swirl flaps. But I did send in the swirl flaps with the intake for ultrasonic cleaning.
After the first cleaning session, all oily residue was gone but still some carbon left in the intake. The cleaning facility took it back and soaked it overnight in a cleaning solution and then hit it again with ultrasound. This time it came back squeeking clean:
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