my engine makes a loud noise sounds like a race car its when i start the car and especially when i accelerate its real loud and when i put on the a/c what is this noise
Hello and thank you for using JustAnswer.com
This noise you are talking about, does it seem like it's in the front of the engine? Does turning the AC on and off change it's pitch?
Reply to FixUrNissan's Post: yes when i am at a stop i dont hear the noise if i turn on the a/c i hear the noise and its more constant but its gets louder especially when i accelerate and it does seem to be in the front.i started to hear the noise i was going about 70 miles an hour for about 10 minutes then i started to hear the noise before that it was fine.I juss recently replaced the engine manifold gasketand the knock sensor.
It sounds to me, like it could either be a ac compressor or the drive belt pulley. If the noise is only present when the AC is on, I would lean towards the compressor making the noise. If it's constant, and more pronounced when the AC is on, then it could be a belt pulley. I would look into those to items.
Hope this information helps. If you have any more questions, please feel free to ask. Thanks Jay!
Reply to FixUrNissan's Post: could any of those be a result of me going fast cause it started making that noise after that because when i go over 65 the car shakes also
I don't think going fast is the cause of it. Does the noise change it's pitch the faster you go? Does the noise go away when you turn the AC off?
Reply to FixUrNissan's Post: the noise is more constant with the a/c on but if i turn the a/c off the noise is there only when i acelerate and its gets louder the more i give it gas when im driving
The shaking I would think is a tire balance issue. The noise I would think is a possible compressor going bad, or a belt pulley. If I heard the noise, and was able to test drive your car, I would be able to find it easy, but over the net, it's harder and I can only give you a general location to check into. Thoughts are my thoughts on what I think your noise could be.
If you have any more questions, please feel free to ask.Thanks Jay!
20 yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer