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 ?

[wonkipop]

you might have fixed it @StarBear .

(IMG:style_emoticons/default/beerchug.gif)

a throttle not fully returning would certainly do that trick.

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re the mysteries of the L jet AFM.
nihil44 has just come on that other thread about Air Fuel Ratio for L Jet.
has posted some fantastic images of all the guts of the different AFMs.
the temp sensor is definitely there in the 74 but there is no visible wiring in.
so its some kind of direct connection that is integrated as clay perrine states and as i surmised.

http://www.914world.com/bbs2/index.php?sho...60274&st=40

its just for curiosity value @StarBear .
guarantee its not your temp sensor playing up.
did a bit more reading on that and if it was a defective temp sensor the car would be running badly all over the rev range and in extreme cases might not even start and run.
if you are the least bit worried just do the test i posted on page 2.
you cannot isolate out the temp sensor but i guess given its part of it all if the test values don't come out good it means it could be the villian and there is not much you can do about it.

i've been trying to find factory manual info on the 75 and can't find anything.
was thinking there must be a test for the sensor for that one given its wired in separate.
but nothing in the literature i have. (IMG:style_emoticons/default/beerchug.gif)