[Dave A.]

Is a replacement vacuum advance diaphragm available from Toyota. Replacing the vacuum advance diaphragm would allow for increased spark advance under part throttle cruising conditions. This would help your fuel economy and improve your throttle response.

 

[Dave A.]

I'm not sure if the diaphragm can be purchased seperately or not. If Toyota doesn't sell it seperately, you might try an import parts store that stocks Beck-Arnley parts.

 

[Dave A.]

Beck-Arnley is a well respected name in the import parts business. The quality of their replacement parts is very close to OE in some cases and at a much lower cost.