Quote:
Originally Posted by Speedy Squirrel
You asked for which cars open the IAC, and I gave you an IAC example and an ETC example. You also contradicted yourself in the same statement, first saying it "masks" turbo lag, then claiming it is "purely emissions strategy". This thread is getting pointless.
Fairman, I will take all the decel valves you can send, as they are worth 500 bucks apiece!
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Yes. It "masks the lag" by overshooting
throttle opening when you press on the pedal. It virtually opens throttle more than you wanted. This on other hand has nothing to do with idle valves or engine braking vacuum limiting as it happens in accelleration phase and not deccel.
And I still say: deccel valve's only function is to limit popping on deccel....that's it. Turbo couldn't care less as it's protected by BOV.
Further: there are no cars with idle valve which is opened by ECU on overrun. There are cars which close their servo-operated throttles in lazy manner and there are dashpot-dampers on throttle levers. But no stepper-valves opening on overrun.
The only sure-fire way to eliminate popping is to either install EFI or to use feature introduced in KE3-Jetronic: EHA-actuator which quickly raises controll pressure on overrun and thus shuts down flow into to engine.