Q: I have a tapping noise coming from left side of motor on top while pressing the gas on cold starts.

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When I push the gas to accelerate in the morning or during a cold start period I hear a tapping noice only when I push the gas. Has been going on for about 2 months now. Oils never been ran low and I use 2nd grade gas. It idels fine with no taps at all or even revving the engine while in park it still doesn't tap. But if I put it in gear and take off it'll start tapping while I'm pressing the gas.

My car has 197234 miles.
My car has an automatic transmission.

Hello. The most common cause of this noise in your vehicle is a leaking exhaust manifold. It is common for the bolts on the rear of the manifold to break, causing a small leak. Most of the time you will hear it in park, but if the leak is very small you will not hear it until you start driving which puts a larger load on the engine. If the exhaust manifold is fine then it may be caused by a lifter that is collapsing. I would usually pull the valve cover off to inspect the rocker arms for looseness. If it is loose then it may need a lifter. If you plan on having the vehicle looked at as a certified mechanic can come to your home or office to diagnose the source of the sound.

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