One solution to poor warm-up idle.

[Al Campbell]

Thought I'd share a solution with you.

I have had problems with idle in cold weather on the 1983 GGTV6. Tried cleaning & adjusting  the AAV etcetera. Adjusted idle & so on. After warming up for 2 or 3 minutes, I have to feather the throttle on cold (< 10 deg C) mornings at the lights as it threatens too stall.

A Bosch L-Jet document I found mentions two stages of enrichment during warm-up. The first 15 seconds proportional to time (whatever that means), then the next 2 minutes dependent on engine temp. I thought maybe the AAV was warming up too quick, so tried unplugging the AAV heater. This made the idle way too high even after 15 minutes of driving. So fast that the L-Jet was in "hunt mode".

The AAV heater has a resistance of about 30 ohm, so I put a 12ohm, 10W resistor in parallel with the AAV heater too slow down the valve close. Seems to work. I have the fully warmed up idle set for about 1200 rpm so that idle at stone cold start for the first few seconds is ok, then during the first ten minutes, idle at traffic lights doesn't drop below 1000 rpm (rather than 500rpm and threatening to stall).

Al.