Question about 2012 Piaggio Fly 50 4V
Starts fine when engine cold. As engine warms up, the idle slows down until it stalls out. I've replaced the diaphragm assembly in the carb with out any improvement! Scooter is 13 months old with 35 miles. Fresh gas in tank with stabil. Drives fine with throttle applied, just won' Idle when warm. No backfiring.
Re-set the idle adjustment screw on carb? Also check fuel / air filter.
Posted on Mar 22, 2014
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Posted on Jan 02, 2017
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Dec 21, 2015 | Cars & Trucks
Dec 11, 2013 | 1987 Ford Tempo
Here are the most common causes of idle surge, rough idle esp when cold and stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
Jul 09, 2017 | Cars & Trucks
Engine stalls or RPM
fluctuates at idle up and down or dies near idle.
This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve but always run a OBD2 fault code as well as the cleaning procedure. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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