Bad IAC motor?? - Page 2 - JeepForum.com

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post #16 of 27 Old 11-24-2011, 08:12 AM
jsawduste
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Quote:
Originally Posted by oldtime_ironman View Post
It's called "back-probe". Basically you try and stick the end of the meter probe into the backside of the connector, right where the wire is also going in. Sometimes the probe is too fat - so you can stick a sewing pin in there instead, and hook the meter up to the pins.
.
What the Iron-Dude said. The wife, sister, GF or Mistress will have a safety pin or a straight pin you can stick through the backside of the connector at the wire/seal junction.

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post #17 of 27 Old 11-24-2011, 08:57 AM
grivera
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Quote:
Originally Posted by oldtime_ironman View Post
It's called "back-probe". Basically you try and stick the end of the meter probe into the backside of the connector, right where the wire is also going in. Sometimes the probe is too fat - so you can stick a sewing pin in there instead, and hook the meter up to the pins.
.
thanks!
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post #18 of 27 Old 11-24-2011, 10:28 AM
grivera
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Quote:
Originally Posted by jsawduste View Post
What the Iron-Dude said. The wife, sister, GF or Mistress will have a safety pin or a straight pin you can stick through the backside of the connector at the wire/seal junction.
which is terminal A and which is B?
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post #19 of 27 Old 11-24-2011, 10:42 AM
jsawduste
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Originally Posted by grivera View Post
which is terminal A and which is B?
It is on the connector side. Small letters
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post #20 of 27 Old 11-24-2011, 11:51 AM
grivera
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I had some trouble making contact with a thin paper clip, which I cut in two pieces.
Vehicle off- When contact was made, I read 2.2 with throttle closed and 3.7-4.3 with throttle open. these readings fluctuated and I wasn't able to duplicate the numbers and therafter kept gettin 10+ volts whether or not throttle was open. Above readings were with volt meter scale set to "20"
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post #21 of 27 Old 11-24-2011, 08:11 PM
grivera
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Bmp
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post #22 of 27 Old 11-24-2011, 08:29 PM
oldtime_ironman
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Quote:
Originally Posted by grivera View Post
I had some trouble making contact with a thin paper clip, which I cut in two pieces.
Vehicle off- When contact was made, I read 2.2 with throttle closed and 3.7-4.3 with throttle open. these readings fluctuated and I wasn't able to duplicate the numbers and therafter kept gettin 10+ volts whether or not throttle was open. Above readings were with volt meter scale set to "20"
Here's a better way to test, check out the video:
http://www.youtube.com/v/406BTo4JE3A

Last edited by oldtime_ironman; 11-24-2011 at 08:30 PM. Reason: html
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post #23 of 27 Old 11-24-2011, 08:35 PM
oldtime_ironman
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Quote:
Originally Posted by blueliftedjeep View Post
What would be a good indication that you have a bad IAC motor? what type of symtoms would i experience? i have had a few idle issues as of late. My rpm's like to hang around 1500 inbetween shifts or when i put the jeep in neutral to coast to a stop. as my speed is reduced and i am coming near to a full stop, the rpms will dip down to around where they should be. I replaced the TPS sensor, but that was not the problem. could this be a bad IAC? or will a bad IAC cause different problems?
Here's a pretty easy way to test it all, check out the video:
www.youtube.com/v/406BTo4JE3A
no need for real hassle.
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post #24 of 27 Old 11-25-2011, 05:52 AM
grivera
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Quote:
Originally Posted by oldtime_ironman View Post
Here's a pretty easy way to test it all, check out the video:
www.youtube.com/v/406BTo4JE3A
no need for real hassle.

Thanks. What is meant by the diagnally placed teminals to connect the OHM meter leads? The IAC terminals are 4 in a row...
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post #25 of 27 Old 11-25-2011, 05:57 AM
grivera
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Quote:
Originally Posted by oldtime_ironman View Post
Here's a pretty easy way to test it all, check out the video:
www.youtube.com/v/406BTo4JE3A
no need for real hassle.

Thanks. What is meant by the diagnally placed teminals to connect the OHM meter leads? The IAC terminals are 4 in a row...
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post #26 of 27 Old 11-25-2011, 07:50 AM
jsawduste
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Just do the business card procedure. Cheep and easy.

Start it up and place a business card over a portion of the IAC ports. Slide it back and forth. Exposing more/less of the ports. This acts just like the plunger opening and closing. If the idle comes back down thing you have a bad IAC or dirty seat.

FWIW on my stroker I had to drill a small .030 +/- hole in the throttle plate to pass more air then the TB would allow. This was with a 64mm TB. Not relevant to a stock engine but the point is I used the business card to help obtain the correct sized hole.

If you are still confused then post up. I`ll take a couple pictures later.
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post #27 of 27 Old 11-25-2011, 08:08 AM
oldtime_ironman
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Quote:
Originally Posted by grivera View Post
Thanks. What is meant by the diagnally placed teminals to connect the OHM meter leads? The IAC terminals are 4 in a row...
The IAC in the video was just an example from a Ford or GM car. It was just to show the concept of "how to". To get the right terminals on the jeep, I would refer to the Haynes manual. If you don't have one, I can look it up later on today - but I do recommend getting some good manuals.
.
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