 Idle Speed and Air Temp/Humidity |
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| StarBear |
 Jun 29 2022, 12:46 PM
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#1
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Advanced Member  Group: Members Posts: 2,071 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States 
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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 ? |
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| Van B |
Jul 4 2022, 03:13 PM
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#2
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Senior Member Group: Members Posts: 1,618 Joined: 20-October 21 From: WR, GA Member No.: 26,011 Region Association: None
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Resistance figures outlined in the manual are all we get.
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Posts in this topic
StarBear Idle Speed and Air Temp/Humidity Jun 29 2022, 12:46 PM
StarBear CHT Sensor? Rpm seems to stay steady if air stays ... Jun 29 2022, 01:32 PM wonkipop only thing i can think of is the other temp sensor... Jun 29 2022, 05:28 PM StarBear Will try cleaning those plugs. Grounds are A+ and ... Jun 29 2022, 07:30 PM Van B Steve, sorry for the delay, I’ve been traveling ... Jun 29 2022, 11:20 PM
wonkipop
Steve, sorry for the delay, I’ve been traveling... Jun 29 2022, 11:47 PM StarBear
Steve, sorry for the delay, I’ve been traveling... Jun 30 2022, 05:59 AM
wonkipop
Steve, sorry for the delay, I’ve been travelin... Jun 30 2022, 04:36 PM StarBear
next time it’s all hot and steamy, you should ... Jun 30 2022, 07:52 PM Van B
next time it’s all hot and steamy, you should... Jun 30 2022, 09:15 PM StarBear
[quote name='StarBear' post='3012404' date='Jun 3... Jul 1 2022, 09:54 AM Van B On these cars idle is far more likely to climb fro... Jun 29 2022, 11:24 PM Van B Check it all the same.
But, it seems to me that y... Jun 30 2022, 01:28 PM StarBear @Van B and [b]@[url=http://www.914world.com/bbs2... Jun 30 2022, 04:52 PM Van B The Porsche manual does a terrible job of breaking... Jun 30 2022, 04:56 PM StarBear
The Porsche manual does a terrible job of breakin... Jun 30 2022, 05:27 PM StarBear Ok, looking at Haynes page 177 on fig 9.87 current... Jun 30 2022, 05:43 PM wonkipop
Ok, looking at Haynes page 177 on fig 9.87 curren... Jun 30 2022, 06:03 PM wonkipop oh yeah steve. a loose oil cap will make your id... Jun 30 2022, 06:05 PM wonkipop @StarBear
i looked through the electrical schema... Jul 1 2022, 08:51 PM StarBear
[b]@[url=http://www.914world.com/bbs2/index.php?s... Jul 2 2022, 06:26 AM wonkipop ok @StarBear .
i had to keep digging. as i do.
... Jul 2 2022, 02:18 AM StarBear
(i leave this with [b]@[url=http://www.914worl... Jul 2 2022, 06:30 AM Van B
(i leave this with [b]@[url=http://www.914wor... Jul 2 2022, 08:32 AM Van B Also, still think there's nothing really wrong... Jul 2 2022, 08:34 AM StarBear
Also, still think there's nothing really wron... Jul 2 2022, 09:45 AM wonkipop
Also, still think there's nothing really wron... Jul 2 2022, 05:11 PM Van B Yeah, you’re a native for sure. Did you buy the... Jul 2 2022, 10:38 AM StarBear
Yeah, you’re a native for sure. Did you buy th... Jul 2 2022, 07:48 PM wonkipop
Yeah, you’re a native for sure. Did you buy t... Jul 2 2022, 08:11 PM Van B That’s a differ AFM than both of mine.
The one I... Jul 2 2022, 05:30 PM wonkipop
That’s a differ AFM than both of mine.
The one ... Jul 2 2022, 06:02 PM wonkipop
i'm just curious about it @[url=http://www... Jul 2 2022, 06:31 PM wonkipop its cold down here today.
almost new jersey or mar... Jul 2 2022, 10:28 PM StarBear @wonkipop Yep, we’re just a few miles north o... Jul 3 2022, 06:45 AM StarBear @clayperrine Would you mind chiming in on this w... Jul 3 2022, 06:58 AM StarBear Update: Had a nice 30+ minute run today including ... Jul 3 2022, 09:27 AM wonkipop
Update: Had a nice 30+ minute run today including... Jul 3 2022, 06:06 PM Van B
Update: Had a nice 30+ minute run today including... Jul 4 2022, 09:53 AM ClayPerrine In reference to the air flow meter, the air temp s... Jul 3 2022, 02:27 PM StarBear
In reference to the air flow meter, the air temp ... Jul 3 2022, 04:12 PM StarBear @wonkipop [b]@[url=http://www.914world.com/bbs2... Jul 4 2022, 09:47 AM Van B What I previously described is my method to see if... Jul 4 2022, 10:00 AM StarBear Solved, I think/hope.
Did the TB test suggested b... Jul 4 2022, 12:33 PM ClayPerrine
Still begs the answer to all our questions about ... Jul 4 2022, 01:18 PM StarBear
Still begs the answer to all our questions about... Jul 4 2022, 01:58 PM ClayPerrine
Resistance figures outlined in the manual are all... Jul 4 2022, 03:46 PM StarBear
Resistance figures outlined in the manual are al... Jul 4 2022, 05:03 PM wonkipop you might have fixed it @StarBear .
:beer2:
a... Jul 4 2022, 08:14 PM Van B I wouldn’t take those pics of the ‘74 as certa... Jul 4 2022, 11:21 PM wonkipop
I wouldn’t take those pics of the ‘74 as cert... Jul 4 2022, 11:28 PM wonkipop @StarBear .
just noticed something about your T/B... Jul 5 2022, 01:19 AM StarBear
[b]@[url=http://www.914world.com/bbs2/index.php?s... Jul 5 2022, 05:52 AM StarBear Update 2:
+ did the pin tests in cool garage with ... Jul 5 2022, 07:24 AM StarBear Second test run for 20 min done.
Pins 6-9 at 324 ... Jul 5 2022, 09:55 AM nihil44 Apologies to the group for posting photos of what ... Jul 5 2022, 06:00 PM Van B Yeah that is definitely the ‘74 AFM right there... Jul 5 2022, 07:39 PM wonkipop
Yeah that is definitely the ‘74 AFM right there... Jul 6 2022, 06:11 PM |
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