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International Automotive Technicians Network
Re: 1986 Corolla - hard start first thing in morning
Posted to Technical Discussion Forum on 10/22/2002

Hi Peter,

The diaphragm you are referring to is the AAP (Auxiliary Accelerator Pump).

The AAP serves only 1 function - to provide additional fuel when stepping on the gas, only when cold. It is signalled via a TVSV (Thermo vacuum Switching Valve), and when... Login to read more.