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 ?

[Van B]

Also, still think there's nothing really wrong with StarBear's car other than the fact he lives in NJ!

[wonkipop]

Also, still think there's nothing really wrong with StarBear's car other than the fact he lives in NJ!

(IMG:style_emoticons/default/biggrin.gif)

------

i agree re steve's car.


--------
thanks for the image of the afm. cool. saves me murdering the pterodactyl perched on top of my engine.

i think i can see the two wires that go to it in yours.

here are a couple of good clear pics i dug up of an AFM off a BWM K100 forum.

an early one.



a later one.



i believe it is the thing in bottom right of AFM in images with a couple of wires to it.
i think it just gets wired in differently in the early AFM if indeed i am right about it being there. it looks like its replaceable in these later AFM. undo two screws. but its probably fused in to the unit in someway in ours and can't be replaced easily?

the drawing in the workshop manual is just an oktoberfest cartoon since tampering with the moonshot tech was VERBOTTEN in 1974.