Mazda CX-7 owners have reported 3 problems related to engine grinding noise (under the engine and engine cooling category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mazda CX-7 based on all problems reported for the CX-7.
I started to accelerate after coming off of an exit ramp when I heard a noise from the engine then I started to lose power. Immediately after that when I depressed the gas pedal to accelerate, a grinding noise occurred. I was able to get the vehicle to a parking lot. I had the car towed to Mazda dealership who informed me that the turbo had failed. They want all maintenance records for the time I have owned the car in order to make a determination of whether it will be covered under warranty. I purchased an extended powertrain warranty which covers the engine and turbo to 100,000. But it appears they are stating it is due to improper maintenance as I cannot produce all my oil change receipts.
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While driving with family, air conditioner suddenly started blowing warm air. All attempts failed to adjust air conditioning. This failure has only happened once but is still not operating properly. When the vehicle was started the next day it began making a grinding noise. The suspected defect is the a/c compressor, it has not been repaired or replaced.
2007 Mazda Cx-7 started making a grinding sound from underneath the hood, with smoke bellowing from the engine. Come to find out that the a/c pump and or compressor has suddenly seized causing major damage to the engine and vehicle itself.