Skip the auto shop - Our mechanics make house calls

Q: Loud popping noise where header and exhaust meet

asked by on

I had an exhaust leak on the left header. Replaced the gasket and fixed it. When I cranked it afterwards, a loud pop was coming from the donut gasket and it would shake the car violently and it happens in random intervals. I don't know if I broke the donut gasket or cracked the header or if it's an exhaust bang. Any ideas on what it could be? Thank you

My car has 68000 miles.
My car has an automatic transmission.

Hi there - the "combustion bang" you hear taking place at the header flange probably indicates a leak at the donut gasket as you suspect. Unburned, or still burning, fuel catches some fresh oxygen at the flange, and ignites, producing the noise you hear. It might help to lean out your carb in the rpm range this occurs - check your plugs for lean/rich clues. It’s also possible your timing is off a tad (not advanced enough).

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

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: Car won't start if I let it sit

Hello. It sounds as if you have a restricted fuel supply or contaminated gas. A trained technician will easily be able to pressure test your fuel system and inspect the quality of the gasoline. Also, I notice your car is...

Q: The flex pipe needs to be replaced.

Yes, the entire section of pipe the flex pipe is attached to can be replaced. For the best fit, consider ordering the part from your local dealer. The repair may take some time depending on how much rust has built...

Q: brakes/accelerator/steering wheel all locked up while driving

Hi there, thanks for writing in. This sounds like a tricky problem, there could be any number of causes. It could be the engine/powertrain control module was shaken over the bump and was damaged, causing it to stall the car,...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.