View Full Version : surging at idle

12-15-2001, 11:05 AM
most likely cause for dramatic surging when at idle? anyone? heh, thanks much

12-15-2001, 03:20 PM
Is it surging -increase in RPM's- or -decrease in RPM's-..?
Increase could be a vacuum leak around the throttle shaft in carb, engine sees this as the throttle opening. Common on old carburetors due to wear.
Decrease could be clogged fuel filter, bad fuel pump, incorrect float level, or wiring problem in ignition circuit.

12-16-2001, 08:53 PM
It could be a variety of problems.
First check your air filter, it could be choking the engine a bit. but it works when your vacuum level is higher. Try running it without the air filter.