Popping sound in headers

When the engine isn't warmed up it is usually running rich because of the choke. Also might be mis-firing once in a while for the same reason. Both of these can cause some unburned fuel to enter the exhaust. If you have a leak in the exhaust system, like where the header connects to the head or at a collector gasket, it can let air enter the system. This air can mix with the unburned fuel in the exhaust and cause it to explode. Result is a popping sound in the exhaust. I've often noticed this, particularly when the car is slowing under compression, like when you have just let off of the gas. This MIGHT be the cause of your problem. I'm really "old school" & not up on the latest technology. Somebody else here might have other ideas.


:burnout: