Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WJ > Engine Performance/Intake/Exhaust

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 01-29-2011, 04:41 PM
Member
 
Join Date: Jan 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1267
westcoast is on a distinguished road
Won't idle

My 1999 4.7 over heated. I flushed the system and refilled. It is now idling very rough and dies! It seems to run ok going the road.
Any ideas?
Thanks
__________________

__________________
Reply With Quote
  #2  
Old 01-29-2011, 05:05 PM
Scottina06's Avatar
JeepGarage Founder
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: May 2009
Location: Berea, Kentucky
Posts: 48,729
Thanks: 816
Thanked 796 Times in 616 Posts
Rep Power: 7717292
Scottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond repute
Garage
Sorry bro....ya warped the heads prolly

Sent from my MB300 using Tapatalk
__________________

__________________
SCOTT
The HARDER you work...the LUCKIER you are!
2014 REDLINE red Jeep SRT "BLOODIED Edition" 1 of 1
Previous JEEP rides-
2013 Jeep Grand Cherokee SRT-deep cherry
2013 JKU 10th anniversary-white
2006 Jeep Grand Cherokee Laredo-inferno red



Twitter-The_Jeep_Guy
Instagram-thejeep_guy

Reply With Quote
  #3  
Old 01-29-2011, 05:26 PM
Crispy's Avatar
Member
My Jeep: 1999 4.0L XJ
 
Join Date: Sep 2010
Location: Queens NY
Posts: 37
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1426
Crispy is on a distinguished road
Re: Won't idle

Good chance that you did warp the heads. How long was it driven while overheated? Did you find the cause to it overheating? Need more info to try and help you out.
__________________
-Chris
1999 Jeep Cherokee Classic
1999 Pontiac Trans Am
1985 Chevy Monte Carlo SS
Reply With Quote
  #4  
Old 01-29-2011, 05:33 PM
Member
 
Join Date: Jan 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1267
westcoast is on a distinguished road
Re: Won't idle

I'm pretty sure I didn't warp the head. After changing the water in the radiator I did not know to bleed the system so it got a little hot but I was right there working on it so when it started to get hot i shut it off. After bleeding the system it started right up and I can drive it but it will not idle. Do you think it could be the collant temp sensor? Maybe to got hot and is messed up!
Thanks
__________________
Reply With Quote
  #5  
Old 01-29-2011, 07:37 PM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,641
Thanks: 9
Thanked 54 Times in 52 Posts
Rep Power: 525436
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: Won't idle

These 4.7 engines really don't like to be overheated. Not removing the bleed screw will leave a large amount of air in the system and can cause heat damage very quickly. You don't have your check engine light on? Its possible that you blew your head gasket. Any signs of air bubbles in the cooling liquid expansion reservoir?
The PCM uses the coolant temp sensor for several calculations, but not sure if a broken sensor would make it unable to idle. Just disconnect the sensor and see what happens.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #6  
Old 01-29-2011, 08:34 PM
Member
 
Join Date: Jan 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1267
westcoast is on a distinguished road
Re: Won't idle

The check engine light is on now!
__________________
Reply With Quote
  #7  
Old 01-29-2011, 10:15 PM
Scottina06's Avatar
JeepGarage Founder
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: May 2009
Location: Berea, Kentucky
Posts: 48,729
Thanks: 816
Thanked 796 Times in 616 Posts
Rep Power: 7717292
Scottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond repute
Garage
Re: Won't idle

do the key dance and pull the code or have the code pulled
__________________
SCOTT
The HARDER you work...the LUCKIER you are!
2014 REDLINE red Jeep SRT "BLOODIED Edition" 1 of 1
Previous JEEP rides-
2013 Jeep Grand Cherokee SRT-deep cherry
2013 JKU 10th anniversary-white
2006 Jeep Grand Cherokee Laredo-inferno red



Twitter-The_Jeep_Guy
Instagram-thejeep_guy

Reply With Quote
  #8  
Old 01-30-2011, 08:50 AM
Member
 
Join Date: Jan 2011
Posts: 6
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 1267
westcoast is on a distinguished road
Re: Won't idle

Code P0308
__________________
Reply With Quote
  #9  
Old 01-30-2011, 09:44 AM
Frango100's Avatar
Premium Member

My Jeep: 2004 4.7L WJ
 
Join Date: Dec 2009
Location: Brazil
Posts: 4,641
Thanks: 9
Thanked 54 Times in 52 Posts
Rep Power: 525436
Frango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond reputeFrango100 has a reputation beyond repute
Re: Won't idle

Cilinder 8 misfire detected. Maybe best to do a compression check on all cilinders to see how that looks. But after an engine overheat, there is a big change of head warp or headgasket problems.
__________________
Frank

JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks / Pirelli Scorpion ATR 245/65/17 - Transgo reprogramming shiftkit.

VW Beetle 2.0 TSI 2013
My new toy
Reply With Quote
  #10  
Old 01-30-2011, 10:23 AM
Scottina06's Avatar
JeepGarage Founder
My Jeep: 2014 6.4L SRT8 WK2
 
Join Date: May 2009
Location: Berea, Kentucky
Posts: 48,729
Thanks: 816
Thanked 796 Times in 616 Posts
Rep Power: 7717292
Scottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond reputeScottina06 has a reputation beyond repute
Garage
Re: Won't idle

yep...pull that plug and do a cooling system pressure test.....sounds like a blown gasket and maybe a slightly warped head. Could be as small as a pin leak or pin holes in the head right around the #8 cylinder
__________________

__________________
SCOTT
The HARDER you work...the LUCKIER you are!
2014 REDLINE red Jeep SRT "BLOODIED Edition" 1 of 1
Previous JEEP rides-
2013 Jeep Grand Cherokee SRT-deep cherry
2013 JKU 10th anniversary-white
2006 Jeep Grand Cherokee Laredo-inferno red



Twitter-The_Jeep_Guy
Instagram-thejeep_guy

Reply With Quote
Reply

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
Squeaky idle. JeepKid Grand Cherokee - WK 3 11-14-2010 09:45 PM
High idle j-lien Engine Performance/Intake/Exhaust 3 11-14-2010 04:48 PM
idle problem cameo571 Trouble Shooting/Problems/Service 2 11-12-2010 04:32 AM
RPMs idle wk2silverbullet Grand Cherokee - WK2 - 14 10-12-2010 05:54 PM
Crap Idle? 4.7 V8 NHWK05 Troubleshooting/Problems Discussion 23 06-18-2009 03:21 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 05:31 PM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community