 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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| StarBear |
Jul 4 2022, 12:33 PM
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#2
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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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Solved, I think/hope.
Did the TB test suggested by Van. No stalling or change. Van, maybe we can chat during the upcoming Gathering to make sure I did it correctly. The hose going into the back of the TB is nice and snug. Drove for 20 minutes and the idle didn’t fall off from the preset slightly higher idle the entire time. So , have backed off the higher idle a bit and will retest tomorrow morning. Still begs the answer to all our questions about if/where our 1.8s have a Temp Sensor I. Onward! |
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| ClayPerrine |
Jul 4 2022, 01:18 PM
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#3
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Life's been good to me so far..... Group: Admin Posts: 15,902 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille
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QUOTE(StarBear @ Jul 4 2022, 01:33 PM)  Still begs the answer to all our questions about if/where our 1.8s have a Temp Sensor I. It is built into the air flow meter. You cannot replace it. Clay |
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| StarBear |
Jul 4 2022, 01:58 PM
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#4
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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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QUOTE(ClayPerrine @ Jul 4 2022, 03:18 PM) QUOTE(StarBear @ Jul 4 2022, 01:33 PM) Still begs the answer to all our questions about if/where our 1.8s have a Temp Sensor I. It is built into the air flow meter. You cannot replace it. Clay Hmmmm and suppose no way to test it separately, either? |
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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 Van B Resistance figures outlined in the manual are all ... Jul 4 2022, 03:13 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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