jeep surge idle - Page 2 - Jeep Garage - Jeep Forum

Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > Troubleshooting/Problems

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #13  
Old 11-20-2014, 02:34 PM
Jeff1119's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Nov 2014
Location: Staten Island, New York
Posts: 293
Thanks: 32
Thanked 9 Times in 9 Posts
Rep Power: 1063
Jeff1119 is on a distinguished road
Re: jeep surge idle

Quote:
Originally Posted by Furyous68 View Post
IAT (Intake Air Temperature) sensor. It's located under the air box plenum (boxy part of the air-cleaner assembly that is right in front of your throttle body)

Here's the part: More Information for STANDARD MOTOR PRODUCTS AX69

Could also be your Idle Air Control Valve: More Information for STANDARD MOTOR PRODUCTS AC482

But, the temperature sensor is cheaper, so I'd start with that. Plus, I think it's the only sensor that could screw with the computer's idle controls if it was relaying the wrong temps.
How would you remove the sensor from the box? Also I don't believe I have an iac as I have a drive by wire throttle body and the iac is located in the throttle body

Reply With Quote
Sponsored Links
Advertisement
 
  #14  
Old 11-20-2014, 02:44 PM
Member
 
Join Date: Jan 2012
Posts: 181
Thanks: 1
Thanked 2 Times in 2 Posts
Rep Power: 1987
Boomer914 is on a distinguished road
The iac is there. I've replaced it as well though with no change. Have never replace the air temp sensor. If you are looking at the engine from the hood, the iac is one the right of the throttle body. Two torx I believe hold it in place.
Reply With Quote
  #15  
Old 11-20-2014, 02:58 PM
Member
 
Join Date: Sep 2014
Posts: 54
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 866
Furyous68 is on a distinguished road
Re: jeep surge idle

Quote:
Originally Posted by Jeff1119 View Post
How would you remove the sensor from the box? Also I don't believe I have an iac as I have a drive by wire throttle body and the iac is located in the throttle body
The IAT sensor should just twist out of it's socket... at least that's how it comes off my Hemi air box.

That IAC is what was listed for your vehicle with the 3.7l. It doesn't control the throttle body blade. I believe it has a plunger-type valve that open's & closes to allow a certain amount of air to bypass the blade for cold/ warm idle.

I don't know how the computer processes the info.. but I wouldn't doubt that even your thermostat affects idle. If it's sending wrong temperature readings (saying the engine is warmed up when it's still cold, or vice verse) it could cause the computer to jack around with the idle based on conflicting info from other sensors.
Reply With Quote
  #16  
Old 11-20-2014, 03:17 PM
Jeff1119's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Nov 2014
Location: Staten Island, New York
Posts: 293
Thanks: 32
Thanked 9 Times in 9 Posts
Rep Power: 1063
Jeff1119 is on a distinguished road
Re: jeep surge idle

Quote:
Originally Posted by Furyous68 View Post
The IAT sensor should just twist out of it's socket... at least that's how it comes off my Hemi air box.

That IAC is what was listed for your vehicle with the 3.7l. It doesn't control the throttle body blade. I believe it has a plunger-type valve that open's & closes to allow a certain amount of air to bypass the blade for cold/ warm idle.

I don't know how the computer processes the info.. but I wouldn't doubt that even your thermostat affects idle. If it's sending wrong temperature readings (saying the engine is warmed up when it's still cold, or vice verse) it could cause the computer to jack around with the idle based on conflicting info from other sensors.
This is what is there on my 09 grand Cherokee. Starting in 2008, I believe they went with electronic throttle body's which is what I have. The iac and tps sensors are in this electronic throttle body. There is no torx for the iac plunger, only on 07 and earlier
Attached Images
File Type: jpg image.jpg (461.2 KB, 15 views)
Reply With Quote
  #17  
Old 11-20-2014, 05:13 PM
Member
 
Join Date: Sep 2014
Posts: 54
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 866
Furyous68 is on a distinguished road
Re: jeep surge idle

While he uses the wrong description for some of the parts... this video shows where the parts go:



What he calls a "MAF Sensor" is actually the IAT Sensor.

If you look at the throttle body he is removing (7:22 of the Video), you see the wiring he removes. You also see plastic cover clips where that pig tail plugs in. I believe (don't have one in front of me) if you remove that cover, you'll have access to the IAC, & TPS sensor.
Reply With Quote
  #18  
Old 11-20-2014, 05:21 PM
Jeff1119's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Nov 2014
Location: Staten Island, New York
Posts: 293
Thanks: 32
Thanked 9 Times in 9 Posts
Rep Power: 1063
Jeff1119 is on a distinguished road
Re: jeep surge idle

Quote:
Originally Posted by Furyous68 View Post
While he uses the wrong description for some of the parts... this video shows where the parts go:



What he calls a "MAF Sensor" is actually the IAT Sensor.

If you look at the throttle body he is removing (7:22 of the Video), you see the wiring he removes. You also see plastic cover clips where that pig tail plugs in. I believe (don't have one in front of me) if you remove that cover, you'll have access to the IAC, & TPS sensor.
Yeah I've watched this video before. I can see where the iat sensor is now and ordered another one on Amazon for 7 bucks, same one you gave me a link to. Again I have done this already to clean the throttle body before and I can tell you there is no iac or tps under the black box on mine. It's in the electronic throttle body itself. This guy in the video has the same jeep as me. There's nothing under that black box when you remove it
Reply With Quote
  #19  
Old 11-20-2014, 05:38 PM
Member
 
Join Date: Sep 2014
Posts: 54
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 866
Furyous68 is on a distinguished road
Re: jeep surge idle

I was taking an uneducated guess... I have the 5.7l in mine.

In that case, I'm wondering why the part is listed for a 2005 Jeep Grand Cherokee w/ 3.7l engine. Also says there is a TPS available, which is makes sense since these engines are using a speed density system.
Reply With Quote
  #20  
Old 11-20-2014, 09:40 PM
Jeff1119's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Nov 2014
Location: Staten Island, New York
Posts: 293
Thanks: 32
Thanked 9 Times in 9 Posts
Rep Power: 1063
Jeff1119 is on a distinguished road
Re: jeep surge idle

Quote:
Originally Posted by Furyous68 View Post
I was taking an uneducated guess... I have the 5.7l in mine.

In that case, I'm wondering why the part is listed for a 2005 Jeep Grand Cherokee w/ 3.7l engine. Also says there is a TPS available, which is makes sense since these engines are using a speed density system.
our engines are a little different where parts are located. Some sites are screwed up and list parts for vehicles their not compatible with. I got an erg valve on amazon that said its for my 09 grand cherokee but really it was for the 05-07 gc. the 08-10 grand cherokees have a different erg valve which is shaped a little differently and uses tor bolts. I usually use auto zone to find right parts for my jeep. Even if I'm not buying from them, i usually use their site to match the part number. Anyways, gonna give the iat sensor a shot when it comes in. Appreciate the help.
Reply With Quote
  #21  
Old 11-21-2014, 05:57 AM
Strongjeff's Avatar
Project Six Shooter

My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Alpena, MI
Posts: 8,850
Thanks: 393
Thanked 652 Times in 587 Posts
Rep Power: 324064
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: jeep surge idle

you guys, the dbw throttle body dosent have a IAC. your idle speed is 100% controlled by the ecu using the tps. it uses the electronic throttle control to hold your idle speeds within tolerance.



Again, it uses the signal from the tps to open the throttle plate at a specific percentage to control your idle speed.

there is no IAC in the DBW tb!

this is the 3.7/4.7 tb from 2002 to 2007.5


and the 2008 to 2011 3.7tb (2008 to 2010 on 4.7) as you can see there is no slot for the IAC in the TB barrel

__________________
URL]
Reply With Quote
  #22  
Old 11-21-2014, 09:53 AM
Member
 
Join Date: Jan 2012
Posts: 181
Thanks: 1
Thanked 2 Times in 2 Posts
Rep Power: 1987
Boomer914 is on a distinguished road
So what do we do Mr. Strong Jeff. I think I remember you having a long thread on idle issues.....
Reply With Quote
The Following User Says Thank You to Boomer914 For This Useful Post:
  #23  
Old 11-21-2014, 10:24 AM
Member
 
Join Date: Sep 2014
Posts: 54
Thanks: 2
Thanked 1 Time in 1 Post
Rep Power: 866
Furyous68 is on a distinguished road
Re: jeep surge idle

Thanks for setting me straight Strongjeff (no sarcasm intended )
Reply With Quote
  #24  
Old 11-21-2014, 05:52 PM
Jeff1119's Avatar
Member
My Jeep: 2015 3.6L WK2
 
Join Date: Nov 2014
Location: Staten Island, New York
Posts: 293
Thanks: 32
Thanked 9 Times in 9 Posts
Rep Power: 1063
Jeff1119 is on a distinguished road
Re: jeep surge idle

Well guess he said what i was trying to explain basically lol
Reply With Quote
Reply

Tags
jeep

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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


Similar Threads
Thread Thread Starter Forum Replies Last Post
2014 jeep GC Gearbox Surge dwpringle Trouble Shooting/Problems/Service 7 03-29-2014 01:46 PM
2011 Jeep GC Surge/Shudder/ engine miss sensation RTejral Trouble Shooting/Problems/Service 34 10-05-2012 03:41 AM
RPM Surge! Unholyskorn86 Engine Performance/Intake/Exhaust 10 11-01-2010 07:45 PM
Help--Surge at 30 MPH in 05WK 5.7-- Help Juanvaldz Grand Cherokee - WK 16 07-24-2010 08:25 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 03:01 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community

JeepGarage.org is in no way associated with or endorsed by FCA US LLC. Chrysler, Dodge, Jeep, Ram, Mopar and SRT are registered trademarks of FCA US LLC.