Download Honda Programmable FI

IDLE AIR CONTROLS
IDLE AIR CONTROLS
Let’s look at three different idle air control
systems used on PGM-FI models:
• VFR800FI
• GL1800
• VTX1800
VFR800FI Idle Air Control
A starter enrichment valve controls airflow to
each cylinder at idle speeds. The starter
enrichment valves allow air to bypass the throttle
valves at idle to keep the engine running and
provide a fast idle for engine warm up. The
VFR800FI is unique because the starter
enrichment valves are adjusted to different
vacuum readings to compensate for differences
in exhaust length between cylinders.
AIR CLEANER CASE
STARTER ENRICHMENT VALVE
When the starter enrichment valves are open, air flows from the air cleaner case,
past each starter enrichment valve into each intake port.
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PROGRAMMED FUEL INJECTION