what's the funtion of this vacuum advance? accidentally remove from it's location (shown in pic). Noticed the diapraghm leak but no ide when it happened but ignore it bcoz no effect on the engine before.
Recently engine cannot idle in low rpm.
Anything to do with engine idling vs the stuff?
already change the carb but still goes the same story.Engine not idle at all in low rpm.
Any expert will help me..

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The function of vaccuum advance is to advance the spark under high-vacuum conditions. More spark advance = more power. But high vaccuum only occurs at part throttle, so it does not affect full-throttle operation in any way.

If the diaphragm is leaking, disconnnect the hose and plug it.

Your engine will run fine without vacuum advance. Just with a little less part-throttle HP and a little less fuel economy.


This is EGR, not vacuum advance:

Since it has broken off, unbolt the rest of the flange from the engine and fit a new EGR valve. Or remove and bolt a block-off plate of custom fabrication. Also disconnnect the hose and plug it.

thanks dd, great help.