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 1,000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Loud popping noise where header and exhaust meet

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: I have a 1999 Chevy Suburban K1500 4wd the problem started when the serpentine belt broke.

The system will need to be scanned to verify operation of the steering system variable assist system. You will need a Tech 2 or later type scanner to actuate the needed tests on the steering module and steering sensor. I...

Q: Acclerator pedal malfunctioned, misfired, service engine and loud noise

The accelerator pedal position sensor is a common failure item as well the the throttle position sensor in the throttle body assembly. Either sensor can cause similar performance concerns. The cause of these problems usually result in a diagnostic code...

Q: Power steering fluid leak

There are many seals and hoses that can develop leaks over time in the power steering system. I would ask for help from one of the mechanics at YourMechanic. They can come to your location and diagnose exactly what is...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...