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Unread 01-26-2010, 08:08 PM   #1
SPeeDy_RI
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2004 KJ Liberty 
 
Join Date: Dec 2009
Location: RI
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Hesitation/sputtering @ 2,000 RPM

Just in the past couple of days I have noticed that my KJ has been hesitating/sputtering when the RPMs get to 2000. This happens on the backroads as well as the open highway.

When I take my foot off the gas and re-apply, the RPM go beyond.. When the Jeep settles around 2000 RPM, the same things happen when I try to re-accelerate.

Has anyone evernencountered this or have an idea what might be causing it?

I am hopeful that it is a simple issue and not a major problem on the horizon (transmission)

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Unread 01-26-2010, 09:31 PM   #2
LibertyTC
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Did you get a check engine light or transmission light? Get code #s if light is on.
How many miles on your current plugs? Try some new gapped spark plugs...
Bad gas? Get some Chevron Techron (techroline) in mid grade for a hour highway boogie.
Air cleaner dirty? Replace it.
Clean throttle body, and or do emission service.
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Unread 01-27-2010, 11:55 AM   #3
SPeeDy_RI
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No check engine light.
Air filter is clean
Same gas each fillup.... not sure if that is the cause but I could add some additive to it (or fuel injection cleaner)

Not sure what you mean by throttle body.... and how much an emissions service costs or involves
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Unread 01-27-2010, 03:07 PM   #4
Budke
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See if it pulls any codes.
It could be a coil pack or spark plugs.
Possibly a clogged injector.
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Unread 01-27-2010, 04:42 PM   #5
SPeeDy_RI
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How to you check codes? Currently there are no codes that appear on the dash at all.

Also, what is a coil pack? Please excuse my simple questions... this is new territory for me and all the help i can get on this is VERY much appreciated.
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Unread 01-27-2010, 07:17 PM   #6
LibertyTC
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Man we seriously need a "How To" section in here !! You can also search in this forum info like this.
If the CE light is not on, it probably does not have any codes stored.
For reading stored codes, without starting Jeep,
Turn Ignition Key..On-Off-On-Off -ON and leave it on. In the spedometer where it shows the digital mileage, it shuould show the stored codes sequentially eg: P0442 is the code #
Otherwise you can obtain an OBDII reader that does many other things including reading pending code as well.
Autel
Consider getting a Haynes service manual it will help with servicing your Jeep Liberty.
How many miles on your Jeep & spark plugs? Plugs should be changed every 30-40K miles.
If you change your plugs you will know what a coil pack is.
YouTube - How To Change Spark Plugs 02-07 Jeep Liberty 3.7L
Start a process of elimination: Spark Plugs First. Under hood Label tell spark plug gap and type.
Next try the bottle of Chevron Techron in your fuel. This may help clean the injectors.
Bad plugs or coil packs & TPS sensor tend to throw misfire codes.
Start with the two item and note your old plugs condition and old plug gaps.
If they look worn down and are anything other than tan brown, post back you findings.
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Unread 01-27-2010, 11:31 PM   #7
islandpride_671
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hi iam having the same problem....my engine light came on and i had it checked. they said it was my tps sensor, i had it change, but problem still there. its like its misfiring or spottering, i changed the spark plugs and the fuel filter, i added fuel injection cleaner...but problem still the same, do i let it run for a long time? i really dont know what to do anymore..needing help if anyone can help///
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Unread 01-27-2010, 11:34 PM   #8
islandpride_671
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oh iam sorry, i have an 02 jeep liberty 4wd limited,,,,if anyone can reply through here or my email add,,, islandpride_671@yahoo.com
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Unread 01-28-2010, 10:47 AM   #9
LibertyTC
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Probably coil pack going south.
Do you still have a check engine light on..??what are the codes now?
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Unread 01-28-2010, 11:39 AM   #10
islandpride_671
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yea the check engine light is still on. and as for the codes, i really dont know what is it now, cause iam scared 2 drive the jeep to the auto parts place to have them check it, and its about 3miles away from my house. and as for the coil pack, how would i know if there no good anymore?
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Unread 01-28-2010, 12:19 PM   #11
Budke
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Quote:
Originally Posted by islandpride_671 View Post
yea the check engine light is still on. and as for the codes, i really dont know what is it now, cause iam scared 2 drive the jeep to the auto parts place to have them check it, and its about 3miles away from my house. and as for the coil pack, how would i know if there no good anymore?
Quote:
Originally Posted by LibertyTC View Post
Man we seriously need a "How To" section in here !! You can also search in this forum info like this.
If the CE light is not on, it probably does not have any codes stored.
For reading stored codes, without starting Jeep,
Turn Ignition Key..On-Off-On-Off -ON and leave it on. In the spedometer where it shows the digital mileage, it shuould show the stored codes sequentially eg: P0442 is the code #
Otherwise you can obtain an OBDII reader that does many other things including reading pending code as well.
Autel

It helps to read a little bit.
__________________
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Colbert 2016!
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Unread 01-28-2010, 03:39 PM   #12
SPeeDy_RI
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I have no engine light nor any codes using your process above. I really appreciate the efforts. I'm gonna take the kj to a mechanic friend of mine to assess.
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Unread 01-28-2010, 06:08 PM   #13
LibertyTC
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ah...
"Access " I believe.
Good idea to take it to a Mechanic.
He will have a "clue" as to the codes once he plugs into the OBDII hole.
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Unread 01-29-2010, 08:37 AM   #14
islandpride_671
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ya, i turn on and off the jeep and the codes showed 0353,0351,0352,0161. do you know what those codes are?
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Unread 01-29-2010, 08:40 AM   #15
SPeeDy_RI
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I took my KJ to my mechanic friend and he assessed the situation.

As you umentioned, one of the coils needed to be replaced.

I am gonna get the transmission and tune up done while I am at it.

Thanks so much for all your help.
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