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My car makes a vibrating sounds when it's off. What might it be?
Replace it. There is nothing else you can do.'97 Nissa Altima - how do I change the front speakers myself?
map sensor = manifold absolute pressure sensor.Is your car a petrol turbo or diesel turbo?
Wastegate could be loose or disconnected, creates excessive manifold pressure.
Oil in the inlet contaminates the sensor and req's changing.
Check the pipes to and from inlet manifold for security and leaks.
Check the wiring to the sensor, possibly 3 wire connector.
This should give you something to start checking.
Cheers
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