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Old 09-13-2002, 12:42 PM
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Post run on

is run on caused by too advanced/retarded?

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Old 09-13-2002, 01:52 PM
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Advanced typically. Incomplete throttle closing also contributes to it. Those solenoid controls on the carb shut the throttle completely on some cars and can be retrofitted to Rods with a little ingenuity. If the car runs great and doesn't overheat but runs on from time to time installing a solenoid can eliminate this completely in many cases.
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Old 09-13-2002, 01:58 PM
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Usually caused by the throttle blades open too far at idle. After you turn off the key the ignition is out of the picture. If you have to open the blades too far to get it to idle then you either have the ignition too far retarded, a vacuum leak, carb malfunction or some other problem. Find the gremlin and get those throttle blades closed down!

You didn't give us much to go on but these are a few places to start.

Keith
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Old 09-13-2002, 04:52 PM
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could it possibly be either?
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Old 09-14-2002, 06:37 AM
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Run on is caused by combustion that continues after the igniton is turned off. You need fuel and an ingition source to initiate combustion. Remove either and combustion does not occur. So if you have a very hot combustion chamber with something hot enough to ignite fuel and a carb that continues to supply fuel then you will have run on.

Too little spark advance at idle will cause the engine to run hotter and idle speed will be less than a more advanced timing setting hence a more open setting on the throttle blade is needed to get the proper idle speed. A lot of older emissions tuned engines were set up with very little advance at idle to cause a hotter burn and more complete combustion. Then the factory used a kicker solenoid to keep the idle speed up and then close the throttle blades once the ignition is turned off. Older VW carbs have a solenoid built into them that closes off fuel supply unless the igniton is on.

So, I'm not sure if we answered your question or not but hopefully the information is some help.

Keith
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