Rough idle? - Cherokee SRT8 Forum

Auto Insurance

Go Back   Cherokee SRT8 Forum > WK2 Jeep Grand Cherokee SRT8 Discussion (2012+) > WK2 SRT8 Troubleshooting / Problems Discussion / Dealer Service

WK2 SRT8 Troubleshooting / Problems Discussion / Dealer Service If you are having some problems with your WK2 SRT8 and need assistance in troubleshooting and diagnosing the problem, this is the proper place to discuss it. Were you treated fairly or poorly at a dealer? Warranty issues? Let us know.

CherokeeSRT8.com is the premier Jeep Cherokee Forum on the internet. Registered Users do not see the above ads.
Reply
 
Thread Tools Display Modes
  #1  
Old 06-07-2012, 12:03 AM
Infraredcalvin Infraredcalvin is offline
Junior Member
 
Join Date: Apr 2012
Location: Southern California
Posts: 17
Thanks: 4
Thanked 1 Time in 1 Post
Rough idle?

Whith the AC on my truck has a fairly inconsistent idle, I know it's prob the compressor turning on and off but it jumps around 200 to 300 rpm while sitting at a light, feels like it's running rough. The AC in my last truck (07 Tahoe) was much better and you barely felt the compressor on and off. Is anyone else having ismilar issues? I have about 4300 miles now.

Last edited by Infraredcalvin; 06-07-2012 at 12:27 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2  
Old 06-09-2012, 09:58 PM
jeepsjeep jeepsjeep is offline
Senior Member
 
Join Date: Apr 2007
Location: East Central WI
Posts: 211
Thanks: 9
Thanked 16 Times in 12 Posts
Strong compressor means nice cool air and the engine has to work harder at idle to keep the compressor going. Take it as a good sign of a well designed and strong AC system. Your Tahoe was a GM and...well...I shouldn't rip on it. Its just....a Tahoe: soft, quiet, mushy, GM'ish. You now have a high performance muscle truck. Jeeps have always had massive AC compressors. All mine have done that.
__________________
Curent Jeeps:
2012 SRT8
2009 Wrangler X
1980 Jeep CJ7, in line 6 Restored and for sale

Past Jeeps:
2007 SRT8
1995 Cherokee Country
1997 Cherokee Country (Upcountry)
Reply With Quote Quick reply to this message
The Following User Says Thank You to jeepsjeep For This Useful Post:
Infraredcalvin (06-10-2012)
  #3  
Old 06-10-2012, 01:28 PM
waumo waumo is offline
Lifetime Premium Member
Lifetime Premium Member
 
Join Date: Apr 2010
Location: WV
Posts: 824
Thanks: 13
Thanked 69 Times in 65 Posts
Quote:
Originally Posted by jeepsjeep View Post
Strong compressor means nice cool air and the engine has to work harder at idle to keep the compressor going. Take it as a good sign of a well designed and strong AC system. Your Tahoe was a GM and...well...I shouldn't rip on it. Its just....a Tahoe: soft, quiet, mushy, GM'ish. You now have a high performance muscle truck. Jeeps have always had massive AC compressors. All mine have done that.
The AC in my 2011 GMC truck runs rings around both the Jeep and Challenger AC. The GMC cools right now, even at idle. The Chryslers AC is marginal at best and really doesn't do the job until the RPMs are up. I even insulated the AC low pressure lines which helped some, especially on the Jeep which has a lot of exposed metal tubing.

Our 6.1 Hemis idle a little rough compared to most engines. The idle also varies a bit in RPM especially when cold but 200-300 RPM variation we do not get, maybe 100 RPM at most.
__________________
2010 GC SRT8
2009 Challenger SRT8
Reply With Quote Quick reply to this message
The Following User Says Thank You to waumo For This Useful Post:
Infraredcalvin (06-10-2012)
  #4  
Old 06-10-2012, 06:28 PM
Infraredcalvin Infraredcalvin is offline
Junior Member
 
Join Date: Apr 2012
Location: Southern California
Posts: 17
Thanks: 4
Thanked 1 Time in 1 Post
Thanks, this is the kind of feedback I'm looking for before taking into the dealer. This is a big engine, I'm used to higher strung pancake sixes for fun performance cars, and you're right about the gm being more cush. New stuff to get used to...
__________________
Infraredcalvin (aka Pat)
2012 Jeep SRT8 (brilliant black)
Reply With Quote Quick reply to this message
  #5  
Old 06-11-2012, 03:34 PM
bpjgc2012 bpjgc2012 is offline
Member
 
Join Date: Jun 2012
Posts: 44
Thanks: 2
Thanked 2 Times in 1 Post
I notice mine idles rough at startup. It jumps slightly when I turn the ax on but can't say I've noticed continued rough idle with ac operation.
Reply With Quote Quick reply to this message
  #6  
Old 06-11-2012, 06:46 PM
Mongoose9400's Avatar
Mongoose9400 Mongoose9400 is offline
The Traveler
Lifetime Premium Member
 
Join Date: Dec 2010
Location: Dallas, TX
Posts: 5,225
Thanks: 462
Thanked 667 Times in 516 Posts
During initial startup the truck will idle high and bounce around as it finds it's engine idle. Normal operation. It takes time for the engine/fluids to heat up and the idle to smooth out.


Sent from my iPhone 4S
__________________
Zac
2012 WK2 SRT8 Mineral Gray | BT Catch Can | BT Underhood Goodies | Painted Engine Bay | Bwoody CAI | Custom Washer Setup | Shaved Jeep/Color Matched Liftgate Brow| Chrome Delete | Debadge-ReBadged | 5% Tint All Around | 78% Windshield Tint | Passport 9500ix | TLS Rear Fogs | 5k HID Fogs | 6k LED Running Lights | 8k Bi-Xenon | 6K LED Plate Lights | 6k Interior LED Swap | Borla ATAK | WK1 Borla Reso Swap | Matching eBrake Pedal | Trinity | Modified DS 93 Tune
SOLD 2007 Silver Jeep SRT8

Reply With Quote Quick reply to this message
  #7  
Old 06-11-2012, 10:17 PM
Infraredcalvin Infraredcalvin is offline
Junior Member
 
Join Date: Apr 2012
Location: Southern California
Posts: 17
Thanks: 4
Thanked 1 Time in 1 Post
Quote:
Originally Posted by Mongoose9400 View Post
During initial startup the truck will idle high and bounce around as it finds it's engine idle. Normal operation. It takes time for the engine/fluids to heat up and the idle to smooth out.


Sent from my iPhone 4S
It mostly does it when well warm, which is why I thought it was a little odd.
Reply With Quote Quick reply to this message
  #8  
Old 08-03-2012, 10:04 AM
jyg_31 jyg_31 is offline
Junior Member
 
Join Date: May 2012
Posts: 8
Thanks: 0
Thanked 1 Time in 1 Post
I've noticed a vibration when idling at a stop light with the A/C on. It doesn't happen all the time but the vibration gets very loud as if something is loose somewhere and then it stops when I hit the throttle. Since it doesn't happen all the time, I know the dealer is going to tell me they can't find anything wrong, has anyone else had this issue? Any ideas on what it could be? Thanks!
Reply With Quote Quick reply to this message
  #9  
Old 12-19-2012, 11:40 AM
JBasco20's Avatar
JBasco20 JBasco20 is offline
Senior Member
 
Join Date: Oct 2012
Location: Lake Charles, LA
Posts: 350
Thanks: 12
Thanked 20 Times in 16 Posts
mine is perfectly smooth after just a few seconds and then its smooth as silk until it sits overnight or something again..... My service manager said it was a normal characteristic of this engine..
Reply With Quote Quick reply to this message
  #10  
Old 12-25-2012, 04:41 PM
4Jenna's Avatar
4Jenna 4Jenna is offline
Member
 
Join Date: Jul 2012
Location: AZ
Posts: 64
Thanks: 0
Thanked 1 Time in 1 Post
Mine is picky at idle also. When warm and with the A/C off.

Mine usually idles around 600ish rpm which is where it is happy and smooth, other times it idles at 500rpm and the truck has a buzz/vib to it.

Pretty annoying. I usually put it in "N" and back to "D" and it goes back to the normal rpm at idle, or give it a lil throttle to get it back in its happy range.
__________________
2012 Jeep SRT8
95 Mustang T76 9.5@148
JENNABEARSFoundation.org
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Cherokee SRT8 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:
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
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
rough idle steelsrt8 WK1 SRT8 General Discussion 14 03-02-2011 10:02 AM
P0301 Code Rough Idle tkemple WK1 Troubleshooting / Problems Discussion / Dealer Service 24 12-29-2010 08:33 PM
I am throwing a P050D - Rough Idle / Cold Start code. Any advice? WESLEY KAY WK1 Troubleshooting / Problems Discussion / Dealer Service 11 11-24-2010 02:59 PM
kooks headers...rough idle tommy25000 WK1 Intake/ Exhaust Discussion 23 04-03-2007 12:15 AM
rough idle FastSRT8GC WK1 Troubleshooting / Problems Discussion / Dealer Service 11 02-17-2007 09:19 AM

Powered by vBadvanced CMPS v3.2.2

All times are GMT -6. The time now is 07:42 PM.



Powered by vBulletin®. Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
© AutoGuide