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Unread 05-04-2009, 10:02 AM   #1
06liberty
Registered User
2006 KJ Liberty 
 
Join Date: May 2009
Location: canada
Posts: 2
06 Liberty rough idle, low rpm

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Just bought a 06 jeep Liberty. Has 52,000 (not diesel). Has rough idle when stopped at a light. RPM sitting at 500 when stopped. If put in park RPM at 700-750.
*engine light on
Dealership visit 1: replace spark plugs,
*highway travel 1200 km
*engine light on
Dealership visit 2: Blew out carb build up
*in town driving and highway trip 600 KM
Dealership Visit 3: they told me spark plug was dirty with carb tried to adjust the idle
*worked okay for about 10 KM then same issue arises.
The jeep idles so hard the jeep shakes, and now when going to a stop the jeep jerks when at about 8 km/hr until I come to a complete stop. The dealer is telling me that this is normal for a jeep and not to expect it to run like a Cadillac. I have gone on numerous road trips in a Jeep and no one else I know has ever had this issue. I know how normal jeeps are and this is far beyond what "normal". What do I do now?

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Unread 05-04-2009, 11:17 AM   #2
cctrudel
Registered User
1999 WJ 
 
Join Date: Apr 2009
Location: Ashburn, Virginia
Posts: 79
Quote:
Originally Posted by 06liberty View Post
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Just bought a 06 jeep Liberty. Has 52,000 (not diesel). Has rough idle when stopped at a light. RPM sitting at 500 when stopped. If put in park RPM at 700-750.
*engine light on
Dealership visit 1: replace spark plugs,
*highway travel 1200 km
*engine light on
Dealership visit 2: Blew out carb build up
*in town driving and highway trip 600 KM
Dealership Visit 3: they told me spark plug was dirty with carb tried to adjust the idle
*worked okay for about 10 KM then same issue arises.
The jeep idles so hard the jeep shakes, and now when going to a stop the jeep jerks when at about 8 km/hr until I come to a complete stop. The dealer is telling me that this is normal for a jeep and not to expect it to run like a Cadillac. I have gone on numerous road trips in a Jeep and no one else I know has ever had this issue. I know how normal jeeps are and this is far beyond what "normal". What do I do now?

Do you happen to have the Engine Trouble Code? If the engine light comes on again, you can take it to any Advance Auto Parts or Auto Zone and "borrow" the onboard diagnostic code reader and get the code.

My guess based on the symptoms you are complaining about, it could be:
1) the spark plug wiring having corrosion/dirt/grim
2) Ignition coil needs to be replaced I found this site (http://www.justanswer.com/questions/...lugs-2004-jeep)

If you can get that engine trouble code, post it so maybe it will jog some memories.
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1999 Jeep Grand Cherokee 4.0L -RIP

1986 & 1996 Jeep Cherokee XJ - RIP
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Unread 05-04-2009, 01:26 PM   #3
06liberty
Registered User
2006 KJ Liberty 
 
Join Date: May 2009
Location: canada
Posts: 2
Took to dealership again this morning they replaced the #1 cylinder spark plug. They said that they did a few other minor adjustments. I have to go back later in the week to make sure it still is okay. I will post again to update.
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Unread 05-05-2009, 07:02 AM   #4
x99j
Registered User
 
Join Date: Jan 2005
Location: ohio
Posts: 447
what is the misfire count at idle (on the drb 3)? if the missfire count is anywhere near 10 per minute tell them to quit sand bagging you!!!! and have them enact the tsb below to cure your problem! this tsb (TSB 09-007-06) is a known problem on o5-06 3.7L's. it involves misfires at idle and calls for replacing the intake valves! this is most definetly the reason it was traded in.
also have them reflash your pcm with the latest software so you can bump your hot idle to 600rpm. mike
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91 yj 2.5l, ax-5, np 231 3 inck lift, 31'' mud rovers

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