Skip the auto shop - Our mechanics make house calls

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

asked by on

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.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  • Home
  • Questions
  • I have a tapping noise coming from left side of motor on top while pressing the gas on cold starts.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: washed #8 cylinder

A washed cylinder indicates there has been a large amount of unburned fuel introduced into the cylinder. This usually is a result of a no spark condition which will not ignite the fuel in that cylinder. If this is indeed...

Q: Ecu vin verification

Hi there. This really isn't a service we offer or are best suited to give you any "good" advice on. When it comes to ECU's, we always defer to the OEM solution; due to the possibility of connectivity issues with...

Q: 2003 Dodge Dakota still won't start after replacing battery

The starting system is rather simple. The battery, the starter, and the ignition are the only major components. There are a few sensors related to the system that may need to be checked. The first thing you should do is...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.