Quote:
Originally Posted by 3xHounds
Bogie,
I think I recall cold idiling around 1,200 RPM and my lack of patience caused me to depress the accelerator to reduce the high idle. I still had the noisy mushy break feel. Not sure if I am hyper sensitive here, but I perceive that it may be worse.
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The next time you cold start it, check at what RPM it rises to on start, how long it stays there, and then what it initially drops to, followed by its final idle position. I'm guessing the normal design is a high idle followed by a low idle. The "fix" may rev it to a higher idle than high initially, followed by a drop to high idle, and then a drop to low idle. A quick jump to a higher idle than high, followed by a drop to high idle, would conceivable build a vacuum faster.
This is purely a guess, but a somewhat educated guess in that an engine can be made to produce vacuum faster if it is rev'd high and then throttled back.
Of course, there might be other ways, maybe there is a way to achieve the same result by playing with the valve overlap at idle.