@StarBear L Jetronic Temp Sensor II AFM |
|
Porsche, and the Porsche crest are registered trademarks of Dr. Ing. h.c. F. Porsche AG.
This site is not affiliated with Porsche in any way. Its only purpose is to provide an online forum for car enthusiasts. All other trademarks are property of their respective owners. |
|
@StarBear L Jetronic Temp Sensor II AFM |
wonkipop |
Jun 5 2023, 03:12 PM
Post
#21
|
Advanced Member Group: Members Posts: 4,403 Joined: 6-May 20 From: north antarctica Member No.: 24,231 Region Association: NineFourteenerVille |
@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. |
StarBear |
Jun 6 2023, 12:47 PM
Post
#22
|
Senior Member Group: Members Posts: 1,913 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States |
@Wonkipop
{- 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.} => That is my thought, but exploring it as don't know how sensitive it is. {i am sure @Van B will pipe in with a more learned view.} => Hope so! {I would have thought Temp Sensor 2 fault would make the car run rich.} => Depends on fault setting (if no signal temp goes to low fault or high fault)? I might think so - less dense air would call for less fuel, unless temp sensor out, then putting in too much fuel for the density/mass of air entering. If rich, would that drop the idle down? Seems to act at a critical temp point (OK for cold, cool and mildly warm outside air/humidity, then off the cliff with high, like 80+ deg F., 80% humidity, temp/humidity). Will start checking this out after this weekend's activities, then maybe start effort to install the NOS AFM, with adjusted CO, A/F sample port bung, etc. |
Lo-Fi Version | Time is now: 11th June 2024 - 03:45 AM |
All rights reserved 914World.com © since 2002 |
914World.com is the fastest growing online 914 community! We have it all, classifieds, events, forums, vendors, parts, autocross, racing, technical articles, events calendar, newsletter, restoration, gallery, archives, history and more for your Porsche 914 ... |