Starting issues...the saga continues - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 05-12-2012, 11:10 PM   #1
Jeeper
 
Blackpony04's Avatar
 
Join Date: Jul 2011
Location: Youngstown, New York
Posts: 513
Starting issues...the saga continues

I've been fighting a starting issue for months now and thanks to you guys I've concluded that there is an issue with the circuit that tells the IAC Valve to close when the vehicle is being started. However, replacing the IAC valve twice, cleaning the throttle body and IAC inlet, and tracing all the wiring has not resolved the issue. Basically the Jeep will not start/idle unless I step on the gas and maintain idle until I'm in 2nd gear and each time I've pulled the IAC the pin is in the fully extended position.

But lately I've noticed a new symptom. First thing though is that I do have a remote start that the PO installed and trust me when I tell you that I am leaning towards blaming that as much as I can blame anything else. Anyway, sometimes when I go to start the Jeep when I turn the ignition all the way I get nothing as if I have a completely dead battery (no clicks, nothing). When I turn the key back to off and try again it starts up just fine and I know it's not a battery issue as my clock on the radio & all the settings are still correct. That got me thinking. Since there is a circuit that tells the IAC to open when the vehicle is running and a separate circuit that tells it to close when the Jeep is being started (or however it actually works), could a faulty IGNITION SWITCH be causing my IAC issues since I'm assuming the message to adjust the IAC originates there? It would explain the infrequent dead battery when the key is turned issue (though again I almost want to blame that on the remote start but I rarely use it so every time there's been an issue it's been with the key being used. Just trying to get my hands around this problem as my wife won't drive the Jeep anymore because the starting issue is now happening about once every 10 tries where it used to be only about once every 100.

__________________
'12 Black Sport JK
Blackpony04 is offline   Quote Quick Reply
Old 05-13-2012, 01:49 AM   #2
Jeeper
 
Buz 1's Avatar
 
Join Date: Sep 2011
Location: Beaverdam, Ohio
Posts: 214
i don't know where u get ur info,, but i can find nothing anywhere on iac function. its my understanding that the 'puter controls its operation. in ur shoes i would uninstall the remote-start system & see what happens. u mention pulling the iac & finding it in an extended position as if it is not normal, & i think it is. i doubt there r 2 circuits from i-switch to iac, but the failure to crank issue could easily be caused by a faulty i-switch. next step after the i-switch would probably be swapping pcm to c if that fixes it. gonna follow this thread lookin for answers to my own iac problems. good luck with it...

__________________
'97 TJ, 2.5L 5sp


Buz 1 is offline   Quote Quick Reply
Old 05-13-2012, 09:14 PM   #3
Jeeper
 
Blackpony04's Avatar
 
Join Date: Jul 2011
Location: Youngstown, New York
Posts: 513
I got my existing information regarding the IAC from some fellow Jeepers here. The thing with the plunger (for lack of a better word) is that on my first replacement IAC I would remove it when it wouldn't start and press down and turn the plunger to close it and the Jeep would start immediately upon reinstallation. So that tells me it extends when the Jeep is not idling and closes when it's idling (or vice versa as it's so flipping confusing) so something is telling it to do that and while agree it may be a PCM issue that's not a cheap option which is why I asked about the Ignition Switch as a possibility.
__________________
'12 Black Sport JK
Blackpony04 is offline   Quote Quick Reply
Old 05-14-2012, 04:28 PM   #4
Jeeper
 
Blackpony04's Avatar
 
Join Date: Jul 2011
Location: Youngstown, New York
Posts: 513
Okay, today something completely different happened. The Jeep started & ran fine but the gauges were all dead and the airbag light was lit. I drove it to pick my son up from school and when I stopped and restarted the gauges acted normally again. This has happened only ONCE but could that also be related to the Ignition Switch or the Remote Start as well? Or does this point to something else? I don't want to throw any more parts at this thing but the Jeep has become so unreliable I don't want my wife to drive it until this issue is corrected. HELP PLEASE!!!
__________________
'12 Black Sport JK
Blackpony04 is offline   Quote Quick Reply
Old 05-16-2012, 07:35 AM   #5
Jeeper
 
Blackpony04's Avatar
 
Join Date: Jul 2011
Location: Youngstown, New York
Posts: 513
Is anybody willing to give some advice on this issue I'm having? The thing with the car acting dead when the key is turned happened again and while removing the remote start is an answer I'd really like to know if this could also be a bad ignition switch. The remote start is worth its weight in gold around here in winter since the Jeep sits outside so I don't want to cut it out unless I really need to but I also don't want to throw parts at it unnecessarily. I've already had it to one mechanic who couldn't fix it and when your mechanic tells you he had to go on the internet to troubleshoot it you know you're screwed!!!!
__________________
'12 Black Sport JK
Blackpony04 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 01:21 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC