Quote:
Originally Posted by RarlyL8
Push in the clutch.
Popping on decel is a function of the CIS combined with freer flowing muffler. The C in CIS stands for Continuous, the injectors will continue to flow as long as the air metering plate is raised. If you allow your engine to engine brake by not clutching during decel the extra unburned fuel will ignite in the muffler. If the muffler is free flowing you will hear the explosions. Stock mufflers mute this with all the packing, baffles and catalytic converter on those cars so equipped.
The idle bypass valve helps mitigate this phenomenon, the burbling becomes more pronounce if that valve is defective or removed.
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Thanks
newbie question is the idle by-pass the same thing as the bov? Also could a semi rich idle mixture add to this popping and and gurgling? i set my idle mixture by Backing off about a 1/8 turn from the injector squeal. A few times, when i trigger the fuel pumps from the engine bay while setting up the wur i could hear a few quick injector squeals. for a seconds then they stop.