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Old 08-24-2010, 09:49 PM   #1 (permalink)
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i have seen many post about when a sammy warms up it will try to stall when you stop.i have the same problem with my sammy . i am waiting to put the newly rebuilt engine in my sammy. i have seen many ?s about this but no answers. when i pull the motor i found no vacums leaks hose are all new carb is very clean and the timing was dead on. new spark plugs ,wires, ,fuel filter and cap and rotor.plus i had 91 octane gas in it. so what the hell could this be??? i had some bearings stacked on my crankshaft which is the cause of my rebuild. but if someone can answer this they are the man.. billjohn or baratcus, you 2 seem to be the ones with the answers so i hope you or anyone else can answer this.
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Old 08-24-2010, 11:02 PM   #2 (permalink)
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When a problem only pops up after the engine is at operating temp it tells me that the heat was allowing for more blow-by. Those 'quick fixes' you see on the shelves at your local auto parts stores basically clogs the leaks inside the motor. I could be off in left field, but I think a proper rebuild will tighten up the tolerances. I would have been interested in the differences between the compression levels before and after the rebuild.
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Old 08-25-2010, 02:02 PM   #3 (permalink)
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another thing it could be is the mixture. The engine likes to run leaner when it's warm and it has several things that it relys on to lean out the mixture properly. One is the O2 sensor, that has to be functioning correctly. The other is the mixture control solenoid in the carburetor that is operated by the ECU from data it gets from your O2 sensor. If either of these two are not working correctly it will effect your mixture and cause operating problems at warmer temperatures. If it is having trouble idling while warm then it could be your Hot Idle Compensator (HIC) which is a small valve inside the carburetor hat.
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Old 08-27-2010, 10:12 PM   #4 (permalink)
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would the HIC happen to be what rocky road outfitters calls the venturi tube. i do have a hitachi carb.
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Old 08-28-2010, 04:15 AM   #5 (permalink)
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No, the HIC is actually attached to the inside of the hat that sits on top of the carb. It's a small bi-metal valve that when it heats up it opens allowing your manifold to suck more air at idle when hot. It's like a controled vacuum leak to lean out the mixture. There's a vacuum line that goes from the base of the carb on the manifold, straight up to the HIC valve in the hat. It's the PITA line that you always forget to hook back up when you're putting the carb hat back on. Obscure and hard to get at back under the inside edge of the carb, but it won't run without the line hooked up to the HIC or blocked off.
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