4k rpm rev limiter??? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Liberty Forums > KJ Liberty Forum > 4k rpm rev limiter???

Rough Country Deals at JeepHut.comEliminate Hood Flutter!!!Introducing MONSTALINER™ UV Permanent DIY Roll On Bed Line

Reply
Unread 03-30-2013, 09:00 AM   #1
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
04 stalls runs rough after warm up/4k rpm limit while driving

trying to help a friend get her liberty fixed, its a 05 with around 112k on it.
when driving under hard accerlation the motor cuts off at 4k rpm, like its hitting the rev limiter. it had been stalling on her at idle after it was warm, i cleaned the iac valve and that seemed to help (it doesnt stall anymore) but still has a rough(to me) idle. there are no lights on the dash. Any guesses on whats wrong??

__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 03-30-2013, 10:21 AM   #2
222Doc
Registered User
2012 JK Wrangler 
 
Join Date: Sep 2011
Location: Lake Havasu City, AZ
Posts: 3,597
Fuel pump. Check the rail preasure
__________________
http://parker4wheelers.tripod.com/index.html
http://www.bullhead4wheelersinc.com
222Doc is offline   Reply With Quote
Unread 03-30-2013, 10:23 AM   #3
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
any idea what it should be?
__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 07-03-2013, 07:15 PM   #4
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
well still didnt fix this. it was hard for me to work on cause she lives 45 min from me but she recently hit a deer and the jeep is now at my work garage so we can fix it so i figured id try to get the stalling issue fixed since it came back. i put new plugs in it but no help. also its a 04 not a 05. so if you start if when cold and just let it idle till it warms up it starts to stumble then will stall, start up again i dle for a minute then stumble and die. im going to buy a fuel pressure gauge this week and start there, just not sure why it would change after its warm
__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 07-03-2013, 08:20 PM   #5
streetglideok
Web Wheeler
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,293
Check and verify fuel pressure. Make sure fuel pressure is sustainable under load. You put in NGK copper plugs gapped to 0.040" correct? O2 sensors can cause issues on these if the heaters do not warm them up fast enough. Badly fouled injectors can also play a factor. A good quality scan tool would make this a lot easier, as it will allow you to monitor fuel trims, important as it helps tell you what is going on inside the engine.
streetglideok is offline   Reply With Quote
Unread 07-04-2013, 05:10 AM   #6
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
I put in whatever plugs the parts store dropped off dont remember what brand but i did gap them to .040. the weird thing is the cel light never comes on, there is a peerform service message though is this a cel light on these?? as soon as i get the some headlights in it im going to take it to get scanned, we have a good scanner but the garage we got it from is borrowing it as theirs broke and their a actuall garage that really needs it, were a recovery/towing company that fixes things sometimes. thanks for the help .
__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 07-04-2013, 10:29 AM   #7
streetglideok
Web Wheeler
2005 KJ Liberty 
 
Join Date: Jul 2011
Location: Colorado Springs, Colorado
Posts: 2,293
Never throw parts in a vehicle without at least knowing what brand the stuff is. Different types, and brands of plugs can have adverse effects on performance. In an ideal world, the parts store flunkies would hand you the right plug every time, but too many go to autozone, and will automatically hand you bosch plugs every time unless you request something better.
streetglideok is offline   Reply With Quote
Unread 07-06-2013, 11:54 AM   #8
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
They were ac delco plugs
__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 07-22-2013, 09:47 PM   #9
BeerMonkeY
Registered User
2007 JK Wrangler 
 
Join Date: May 2005
Location: Lake Winola,PA
Posts: 1,195
update...its fixed. ended up being the map sensor, $22 fix. owner is a happy camper now
__________________
07 Unlimited Rubicon,Reid,RCV,RiverRaider,TenFactory,Fox,Polype rf,Superchips,RockKrawler
BeerMonkeY is offline   Reply With Quote
Unread 07-23-2013, 12:26 PM   #10
TwoBobsKJ
Senior Member
2003 KJ Liberty 
 
Join Date: May 2011
Location: Northern, OH
Posts: 542
Quote:
Originally Posted by BeerMonkeY View Post
update...its fixed. ended up being the map sensor, $22 fix. owner is a happy camper now
That means you're a happy camper now too, right?

Bob
__________________
2003 Renegade, Black
- 3.7L, 42RLE, 4.10's, 4X Guard Trans skid, Factory Engine, T-case, Tank skids, Modded BoulderBars sliders, OME 927/948, Bilsteins, JBA A-Arms & 1/4" top plate, 1 extra rear iso/side, Moabs with Firestone Destination AT's 255/70-16
TwoBobsKJ is offline   Reply With Quote




Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.