Low idle once warmed up a bit. - Page 3 - JeepForum.com

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post #31 of 105 Old 02-16-2014, 05:41 AM
Que89YJ
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What is the 1 51 1? I don't understand. The reading for the temp sensor should be a cold and warm resistance reading.

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post #32 of 105 Old 02-16-2014, 09:55 AM Thread Starter
bigbossd1030
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Okay. I'm doing it again.
I am unsure what setting I should be in. So I'm trying all the ohm ones. On the meter that's in the picture I posted earlier. I get 0 on all the ohm settings when cold. So I tried a different meter picture to follow. On the setting 2000k I get 032.
Oh and all vac lines are connected. I'll post the resistance once warm.
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post #33 of 105 Old 02-16-2014, 10:09 AM Thread Starter
bigbossd1030
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Operating temp I get 001. I don't know what any of this means.

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post #34 of 105 Old 02-16-2014, 12:07 PM
Que89YJ
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The ohms scale for resistance is the one you want to use. It's the omega symbol on the bottom. You are measuring voltage. Measure the 2 pins cold and warm. With the connector off.
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post #35 of 105 Old 02-16-2014, 12:13 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
The ohms scale for resistance is the one you want to use. It's the omega symbol on the bottom. You are measuring voltage. Measure the 2 pins cold and warm. With the connector off.
It is switched to ohms. It's pointing to the 8 o'clock position not the 2 o'clock.
Ohms is in the red circled area no?

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post #36 of 105 Old 02-16-2014, 12:48 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by bigbossd1030
It is switched to ohms. It's pointing to the 8 o'clock position not the 2 o'clock. Ohms is in the red circled area no?
Circled in red doesn't help. Sorry, here's a better picture of where I had it
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post #37 of 105 Old 02-16-2014, 01:25 PM Thread Starter
bigbossd1030
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Got a video of what it does. This time it was at operating temp and this was with a different sensor. I'll post link once it's done uploading to youtube.

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post #38 of 105 Old 02-16-2014, 01:37 PM Thread Starter
bigbossd1030
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There's the video. And would anyone be able to tell me where on my meter I should have it switched to. I understand I need it at ohms. But I've got 5 different spots to choose from in ohms. And I get a bunch of different numbers depending on where I switch it to. At hot, and at 2000k I get 1 At hot and 2000 I get 1115. Thanks again and thanks for all the help thus far.
Edit:bad link.

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post #39 of 105 Old 02-17-2014, 12:20 PM
Que89YJ
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Sorry I was up north this weekend. You want the lowest scale for your anticipated reading. The hot reading should be around 800 so put it on the 2000 scale. The cold reading should be up around 10k + so look at the 20K. The trick is you just dont know for sure so going on the highest and increasing it will do the trick. That is a weird idle. It does it both hot and cold?
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post #40 of 105 Old 02-17-2014, 03:39 PM Thread Starter
bigbossd1030
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No worries. The jeep is drivable so I'm not stranded, I've got time to figure it out.
After replacing the iac and the temp sensor it seems to only do it when the Tstat opens. When it's cold, it does the normal 1500-2000 rpm for a couple seconds then drops to 1000 for a couple of minutes. Then it sits under 1000.
Then just as my temp reaches 100 on my gauge the rpms drop.
Especially if I'am giving it gas then let off.
That's what happened in the video.
I'am going to do a better clean on it after work tomorrow.
I'm going to pull all the sensors and take off the iac housing bit. And I'm going to clean the heck out of it.
Just one thing that stumps me is why would it do it when the Tstat opens??? And I did some searching on the web, there have been a couple of cases where this has happened. But, some people don't post the remedies when they find it.
I'm not sure it has to do with the coolant sensor now. Seeing as how I've got three in my possession and they all do the same thing. I'll try testing it again.
Thanks for all the help.

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post #41 of 105 Old 02-17-2014, 03:53 PM
Que89YJ
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post #42 of 105 Old 02-17-2014, 03:55 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
The air temp sensor.
Is that something that can affect my idle?

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post #43 of 105 Old 02-17-2014, 04:00 PM
Que89YJ
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Normally I would say no. It should effect air fuel but try it. It is quick enough to check.
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post #44 of 105 Old 02-17-2014, 04:01 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
Normally I would say no. It should effect air fuel but try it. It is quick enough to check.
Do I check ohms? Or is it just an unplug and see what happens?

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()_)-()_)--o)_)

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post #45 of 105 Old 02-17-2014, 04:02 PM
Que89YJ
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Ohms just like the coolant sensor. Same resistance readings for it too.
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