October 30: LEMON manuals on a temporary server, it is slow and having issues, download the manuals you need! Later in November we will switch back to the fast server.

Deceleration Mode

During deceleration, fuel remaining in intake manifold can cause excessive emissions and backfiring. To compensate for this, the ECM senses changes in throttle position and manifold pressure and reduces fuel delivery. When decelerating very rapidly, the ECM will cut off the fuel supply for short periods.