@StarBear L Jetronic Temp Sensor II AFM Options

[wonkipop]

@StarBear .


here is what i have on the Temp Sensor II inbuilt into the AFM on the 1.8 L Jetronic.





i could be wrong but i don't think there is any effective way to test the air temp sensor in the AFM on our adam/eve in the garden of eden L Jetronic system. that sensor is not wired in separately.

but maybe there is an expert here who knows.

- in relation to the problem you are having with hot days and ultra high humidity causing the idle to drop to barely running - i'm not sure the symptom fits a faulty Temp Sensor II in the AFM. others here might know better. I would not have thought a faulty sensor would cause that dramatic a result. Temp Sensor 1 (CHT) - yes. but Temp Sensor II no.

i am sure @Van B will pipe in with a more learned view.

I would have thought Temp Sensor 2 fault would make the car run rich.
I think that is how it would work. but again i am probably wrong.
i'd have to think about it.
most trouble shooting literature i can dig up says failure mode causes car to run richer generally. increased fuel consumption.

[wonkipop]

@StarBear

mine is the same as your original.
has the bosch and VW part #
suspect its interior is the same as yours as well.
mine is a jan 74 car about 2 months after yours.



i think the way it works with branded parts that have the car manufacturers logo as well as the component manufacturer numbers and logo is that these are what were originally installed on the production line. as time goes on replacement spare parts tend to have only the component manufacturer's branding and part #.

we found the same thing when we pulled the flywheel off to do the clutch a couple of years ago.
the flywheel washer was original factory installed as was the clutch (long obsolete rubber core clutch). the washer was branded with VW logo. also carried the component makers logo which is the other graphic stamped on it. i forget whose graphic that is but somewhere i have an old VW book that lists all these different manufacturers and logos. these days the replacement washers have long since ceased to be VW branded.



i think the AFMs that carry the VW logo are the original babies.
although they could also have been original production line installed that have been rebuilt. the one you have without the VW branding is a later Bosch spare part.
it looks to me that even though they are 6 pin the interior components installed are later improvements along the way, including giving you access to the temp sensor.

i have not taken my apart but i'm guessing like the original you have pulled off and opened mine has no capacity to test that sensor like the ones that have the separate wires and plugs.

i'll take on board @clayperrine 's comment and info and file that away.

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