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What is your question?
I hear a light knock when engine starts up then goes away but when I add pressure to throttle I can hear it ever so slightly . I just replaced mase air sensor could it be because of that. I had it diagnosed at auto zone and had no code and car has only 71k miles on engine so I don't want to harm it but also it could be nothing Also I looked for anything lose and didn't see nothing exhausts is quiet as a mouse so I don't know why it's making noise although oil life is at 68 percent so would a oil change be the issue though all reads say everything is normal
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Hi, this is Bo, an auto expert on RepairPal's Car Genius team! A light knock on startup that fades away is often related to oil pressure taking a moment to fully circulate through the engine, sometimes called piston slap or lifter tick. At 71k miles that's not necessarily alarming but it's worth paying attention to. The MAF sensor replacement wouldn't cause a knock so that's likely unrelated. 68% oil life remaining isn't bad. As long as you're replacing the oil every 3-4K for non-synthetic and at 7K for synthetic you should be ok. Also, make sure you use the manufacturer recommended oil weight and see if that makes a difference before going further. If the knock gets louder or sticks around longer after startup that would be worth having a shop listen to sooner rather than later! If you need any further advice or want help finding a trusted RepairPal shop in your area, please feel free to call us at 877-913-1554