Starter Valve Synchronization

From VFRwiki

[edit] Explanation by "rode2rouen"

Starter Valve synchronization is similar to carburetor synchronization. The procedure sets the warm (operating temp) idle opening of the throttle body butterflys so the each cylinder is drawing approximately the same amount of air/fuel mixture. This is measured using mercury manometers or vacuum gauges.

On VTEC engines the #4 cylinder is the base setting. The other three cylinders are adjusted to match it's vacuum at idle.

The symptoms of mis-adjusted starter valves are: uneven idle speed, hard starting, rattly sound at idle, vibration at idle. You may have one,two or all four.

The starter valve adjustment has no effect on engine performance at any RPM much above idle.

If your machine exhibits none of the symptoms, your starter valves do not need adjustment.

Rex

[edit] Threads

• Understanding SV Synchronization.

• Best thread available. An outside link... A 30 page thread with a ton of info.

• Another good thread.