Low idle once warmed up a bit. - Page 5 - JeepForum.com

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post #61 of 105 Old 02-21-2014, 06:58 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
The iac controls idle. I know you replaced it. I hope cleaning the t b makes a difference. I would have told you to replace and clean the iac.
Yeah that's where I started. I've got the throttle body out and started cleaning it. I've noticed that the iac housing is held on with security bits. Is that something that is safe to take off? And it's got gaskets. Is that just gasket maker?? It looks dirty inside the housing and it would be nice to get it off if I could.


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post #62 of 105 Old 02-21-2014, 07:18 PM
Que89YJ
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I thought you did that already. That is your problem. Yes take it off and clean it.
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post #63 of 105 Old 02-21-2014, 07:19 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
I thought you did that already. That is your problem. Yes take it off and clean it.
No I didn't do that. I just sprayed the living hell out of it while it was still attached. I pulled the iac and sprayed in there too. But no, I never took the housing off. The one held on with 4 security screws. So that's safe to take off.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
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post #64 of 105 Old 02-21-2014, 07:25 PM Thread Starter
bigbossd1030
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Here is the housing in question. And just to clarify. I did spray the housing with throttle body cleaner. I just haven't removed the housing.
Attached Images
 

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #65 of 105 Old 02-21-2014, 07:50 PM Thread Starter
bigbossd1030
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Okay. I couldn't get the housing off as I don't have security bits. I thought I did. But I can't find them. So I cleaned it as best as I could. Looked pretty clean inside. The passages were all clear etc. didn't help. I am going to try my stat now. It goes up to 100*C before it opens. And if a 195*F stat is 90*C, and the one I have now is a 185*F then it should open before 100*C. I drilled a 1/16" hole in the Tstat. About 1/4" from the edge.
Hopefully this does something for me. Really what's left... PCM?

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
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post #66 of 105 Old 02-21-2014, 08:09 PM Thread Starter
bigbossd1030
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Now here's a thought. What if I had a bad fan clutch? Could this cause any of my symptoms? I'm fishing for ideas now. I'm out of them.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #67 of 105 Old 02-21-2014, 08:11 PM
Que89YJ
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You need to clean the iac. Get the bits. Pull it and clean it. Idle is an iac issue 9/10 times. I thought you replaced it.
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post #68 of 105 Old 02-21-2014, 08:18 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
You need to clean the iac. Get the bits. Pull it and clean it. Idle is an iac issue 9/10 times. I thought you replaced it.
I did. Brand new iac. I cleaned the housing that the iac goes in, I just didn't remove the housing. I took the iac out. Cleaned it. Reinstalled and reset comp. No change. Bought new one. Installed. Reset comp. No change. The only thing that hasn't been removed on my throttle body is the housing in which the iac bolts to. Pictures
Iac housing.
New iac.
Old iac.

I got the housing looking 100% better. I just couldn't get in there with a brush. And if I do get it off. What do I use for the gasket?
Attached Images
     

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

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post #69 of 105 Old 02-21-2014, 08:58 PM
Que89YJ
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It needs to be done too. Harbor freight has the security bits cheap.
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post #70 of 105 Old 02-21-2014, 09:04 PM Thread Starter
bigbossd1030
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I'll stop and princess auto tomorrow morning. They are closed now. Pretty much HF just the Canadian version. Now what about the gasket on the housing. Can that be replaced with gasket maker? Napa and part source didn't have a listing for it.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #71 of 105 Old 02-23-2014, 12:48 PM Thread Starter
bigbossd1030
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Iac housing looks new again and not the problem. I ran a fuel pressure test and at idle I have about 32psi and when I rev it up a bit I get about 40. When I shut it off I got 30 (same as prime) and it slowly raised to 39. Don't know if that is normal. Haynes says way different. I unplugged the o2 sensor just to see. No fix. I still haven't changed the thermostat yet. Was hoping the iac housing clean would fix. So that's next on my list I think. Seems weird that it happens when the stat opens. This must be a coincidence?

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

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post #72 of 105 Old 02-24-2014, 05:36 AM
Que89YJ
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How bad was the IAC housing behind the screws? Did you disconnect the battery and reset the computer?
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post #73 of 105 Old 02-24-2014, 07:44 AM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
How bad was the IAC housing behind the screws? Did you disconnect the battery and reset the computer?
Not bad at all. Once I got it off, it took only 30 seconds to clean it. Almost didn't need a brush. I was thinking it would be way worse than it was. And yeah, I disconnected the battery as well.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

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post #74 of 105 Old 02-24-2014, 06:33 PM
Que89YJ
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So right now the idle bounces when it gets warm but no problem cold,? Is it hard to start. Does it stall?
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post #75 of 105 Old 02-24-2014, 06:36 PM Thread Starter
bigbossd1030
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Quote:
Originally Posted by Que89YJ
So right now the idle bounces when it gets warm but no problem cold,? Is it hard to start. Does it stall?
Mostly correct. Fine cold. Warms up to OT, stumbled when the stat opens and as the temp drops from the coolant from the rad, then as it's warming back up its fine. Then the stat opens and the problem happens again. No problems starting. And no stalling.

/l ,[____],
l----L-[]lllllll[]-
()_)-()_)--o)_)

OFFICIAL JEEPER
Any Jeepers in Edmonton, AB
I am on channel 33.

I live, I ride, I am JEEP.
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