Idle Speed and Air Temp/Humidity Options

[StarBear]

As getting ready for the 2022 Northeast Gathering, I'm encountering a semi-recurring idle issue on my 1974 1.8L LJet FI. When outside air is cool and dry, idles just fine at 950-1000 rpm. When outside air is warm and humid, after warmup the idle falls off to barely running. I've just been adjusting the air flow screw (maybe 1.5-2 full turns) to open it. Of course, the reverse happens - if I preadjust the screw it idles near 1800 then settles down to 1100 after the engine gets totally warm (15 mins or so).
I presume (?) there SHOULD be some regulation, perhaps with the ECU or AFM, to monitor air temp and humidity and make adjustments automatically? I didn't have to manually do this adjustment in the past.
The AAR works and tests out fine. Just annoying to have to pull over after running a while and adjust the screw. (IMG:style_emoticons/default/dry.gif)
Your thoughts @Van @Van_B and @Wonkipop ?

[StarBear]

@wonkipop Yep, we’re just a few miles north of Bernardsville and yes, hitting a deer (or vice versa) will do A LOT of damage. Know of quite a few cars (and deer) totaled when they met in time and space.

A key question with the temp sensor would also be HOW it adjusts things. If there’s a base temp (68F, say) then as air temp increases and density decreases the air for combustion decreases. If the system doesn’t adjust and keeps sending the same fuel there would be a rich condition, dropping the idle speed, which is what I’m experiencing. Just enough for idle to stumble but it quite cut out. A bit of throttle at stops keeps it going until I can pull over to adjust the idle screw more open, about 1-2 full turns.

At that setting when the air is cool again and I go to drive it the next time the idle is 1600-1800, so have to turn down the idle screw until the air is warm again and repeat.

It happened last summer on the way back from the NE Gathering but not in the late Fall, Winter or early Spring. Just started happening again a few weeks ago as warm Summer air invaded. Hence my suspicions about an air temp sensor issue.

Who needs those mind exercise games at my age (70) when I have a 914? (IMG:style_emoticons/default/confused24.gif)