Question about 2012 Mazda 3 i Touring 4dr Hatchback 2.0L 4-cyl. 6-speed Manual w/SKYACTIV-G

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Engine noise and rpms going down

Having issues with my 2012 mazda 3. When the car accelerates the engine makes a rattling sound and the rpms suddenly drop. If I take my foot off the gas the noise goes away and it doesn't happen all the time but it seems like it's occurring more frequently. Also really only happens at lower speeds (between 10 and 30).

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Does the engine light come on during this failure? If it does, please have the codes read and forward them back to me. From your symptoms, it sounds like a mechanical failure. I would inspect the TAC (throttle actuating control) valve. and the throttle pedal, to start? You can look at it physically, inspect the wiring, condition, and operation. If you can get a friend to help. remove the air inlet tube, look at the butterfly inside the TAC unit. Have your friend turn the ignition key to run (DO NOT START THE ENGINE) and watch the butterfly respond as he or she applies and releases the throttle pedal(request to your helper, to communicate how far the pedal is going down and coming back). The motion of the pedal and the butterfly should be smooth and consistent. Would you tell me how often these symptoms occur and does it happen when the engine is cold, hot, or any temperature. Write back with any additional information or questions, good luck.

Posted on Mar 22, 2014

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Posted on Jan 02, 2017

eitan
  • 291 Answers

SOURCE: Engine Making Noise when accelerating

Could be carbon build-up on the pistons, causing erratic flame travel in the combustion chamber... 'pinging'...... Decarbon the engine and use a high grade fuel for a few tanks.... also an octane booster can help

Posted on May 15, 2008

1HOTPRO
  • 1 Answer

SOURCE: Rattleing noise between 2500-3500 rpms 01 protege

Just took my car to the shop for the same appearent reason me also thinking it may be lifters. My mechanic said it spounds like a worn wrist pin ...... bad news for you if this is the case .......recomendations rebuild the engine or buy a new or remanufactured one. if the wrist pin lets go then you could throw a rod. If you must drive the car please be gentle

Posted on Jul 13, 2009

  • 743 Answers

SOURCE: The rpm fluctuates at idle

It could be several things...low fuel pressure, a lazy 0 2 sensor, and even an IAC. If there isn't any service engine lights coming on, you will need a qualified tech to do the test since a lazy 0 2 sensor has to be looked at with some type of a volts meter and a scanner has the capability of doing a better job yet since you wouldn't have to get underneath the vehicle. Don't be fooled into thinking that it is just one thing; it could be several depending on the mileage.

Posted on Oct 03, 2009

  • 1 Answer

SOURCE: mazda cx7 engine noise

just get rid of this car, because you are going to need a new engine soon, my 2007 mazda cx7 with only 33000 miles is at the dealer for engine replacement!!!! only 2 days after i purchased the car

Posted on Mar 19, 2010

  • 2 Answers

SOURCE: I have a 2003 Mazda MPV , the problem only happen

I ahve same issue with my 2004 MPV. I replaced the plugs, coils etc. No help.

did you ever get it fixed?

Posted on Mar 24, 2010

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