Exhaust H?

Question:
My exhaust system backfires. it consists of headers, pipes, and mufflers. i have been told that the back fire in the exhaust system (not the carb) would be caused by air in the pipes because of poor welds. i have also heard that an "H" pipe is the correct way of exhaust work, instead of two isolated straight pipes.

My Renault Espace 2.2 Diesel is burning a litre of oil is 40 miles. The air intake flap is faulty. Problem?

is either reason right? aftermarket carb, bypassing emissions controls, '84 305 K5 GM

Answers:

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A backfire occurs when unburned fuel ignites in the exhaust.

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If you had bad welds what you would hear is the continuous sound of the cylinders firing. (i.e. louder exhaust)

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Check your timing, and if it is OK, lean out the fuel mixture by slightly opening the air adjustments. This will mix more air with the fuel. Carbs running 'rich' tend to cause unburnt fuel.

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All 'H' pipes do is balance the exhaust pressure to quiet the exhaust. If you have performance enhancements like headers, etc. there is no need for the H pipe.

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when does it backfire on exceleration or deceleration sounds like possibly unburned fuel in exhaust then igniting, or ignition not working properly an h pipe will equalize pressure in both pipes or could the mufflers installed on vehicle

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