[T2] What's With the Popping Noise in the Exhaust?

[c.dreike]

I believe it may due in part to the fuel/air mixture enriching slightly 
under those conditions to reduce emissions (thanks EPA). The richer 
mixture is not burning fully in the cylinders and igniting in the 
exhaust manifold. Older engines/carb/dizzies don't do that.

Chris

On 7/1/2017 8:23 PM, Roger Lemberg wrote:
> I’ve been living with this problem since my parents owned a ’69 bus and I know I’m not the only one.
>
> Sometimes, when the car is “overrunning” the engine (long steep down-hills, engine braking) there’s a popping noise (backfire?) coming from the exhaust.
>
> Is there something that can be done?
>
> Peace,
>
> Phrogbus and its Phroggie
> (’70 Sportsmobile conversion)
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