Unknown problem idle problem - 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 Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Unknown problem idle problem

JK specific skid plates from Clayton Off Road Mfg.RCV Heavy Duty Axle Shafts Now Shipping at Baseline4x4.comStainless Steel Door Hinge Pins

Reply
Unread 12-21-2007, 03:20 PM   #1
drunkenmonke
Registered User
2013 JK Wrangler 
 
Join Date: Jan 2006
Posts: 27
Unknown problem idle problem

My 4.0 starts up fine and then goes into a rough idle. I have cleaned the original TPS sensor and swapped it with another used one. The other thing that is connected to the throttle body i have also swapped with another used one(the one where the little square fits into the grooved plastic Im assuming its hooked to the butterfly). I could not find a map sensor to swap out but tried cleaning inside that, could that be the problem? I go thorugh ridiculous amounts of gas when the check engine light finally does come on, but then i just pull the negative battery cable, reset the computer and it runs with no engine light for a while. Everything got submerged in water. I have checked connections and cleaned them out and vacuum lines. A computer hooked up to it said Fuel system lean at bank 1, and the turn key method I believe came up with a 25 code. Please give me all possible ideas because I am running out of them and gettin ready to get rid of this thing if I can't trouble shoot it, I've spent weeks!

drunkenmonke is offline   Reply With Quote
Unread 12-21-2007, 08:50 PM   #2
project78
Registered User
 
Join Date: Jun 2004
Posts: 11
check your temp control sensor,let me know if it'
s it. I had a 5.2 THAT DROVE ME NUTS. every 7 minutes black smoke billow out of exaust.Had to pull over pull the neg cable .again again again.........
project78 is offline   Reply With Quote
Unread 12-21-2007, 08:54 PM   #3
lifted92xj
Registered User
1992 XJ Cherokee 
 
Join Date: Oct 2007
Location: dover, nh
Posts: 1,325
also on the firewall to the right of the valve cover theres a little black computer sensor(brain freeze cant think of what its called) but has ony 1 plug going in..make sure thats connected and tight..i had that problem before and that fixed it..if i find a pic of an enine bay ill mark it out for you
__________________
big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
lifted92xj is offline   Reply With Quote
Unread 12-21-2007, 08:57 PM   #4
lifted92xj
Registered User
1992 XJ Cherokee 
 
Join Date: Oct 2007
Location: dover, nh
Posts: 1,325
not my engine but this is what i was talking about
__________________
big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
lifted92xj is offline   Reply With Quote
Unread 12-22-2007, 08:09 AM   #5
AZ Jeff
Web Wheeler
2000 XJ Cherokee 
 
Join Date: Sep 2005
Location: San Tan Valley Arizona, AZ
Posts: 7,167
Quote:
Originally Posted by lifted92xj
not my engine but this is what i was talking about
That's the MAP (Manifold Absolute Pressure) SENSOR. It senses intake manifold vacuum, and the ECU uses that, along with other inputs, to calculate F/A ratio, and adjust fuel injector pulse duration.
__________________
AZ-Jeff
1992 XJ 2" lift -- RIP
2000 XJ 3" lift -- Australian Ford Big Brakes up front, rock rails, ZJ rear discs (with WORKING parking brake), C4x4 rear bumper/tire carrier, Hella H4 headlights, IPF driving lights, OEM skid plates, OME springs/shocks, JKS LCA's, JKS Sway Bar links.
AZ Jeff is offline   Reply With Quote
Unread 12-22-2007, 10:54 AM   #6
drunkenmonke
Registered User
2013 JK Wrangler 
 
Join Date: Jan 2006
Posts: 27
Thanks, my map is on the throttle body and i cant seem to find a used one or that would have been changed already. I will also try the temp control.
drunkenmonke is offline   Reply With Quote
Unread 12-22-2007, 10:56 AM   #7
lifted92xj
Registered User
1992 XJ Cherokee 
 
Join Date: Oct 2007
Location: dover, nh
Posts: 1,325
Quote:
Originally Posted by AZ Jeff
That's the MAP (Manifold Absolute Pressure) SENSOR. It senses intake manifold vacuum, and the ECU uses that, along with other inputs, to calculate F/A ratio, and adjust fuel injector pulse duration.
thats better than litte black computer thingy..thanks
__________________
big lift, sick tires, awsome accessories, alot of custom work.

my jeep won the war, your honda mows my lawn
lifted92xj is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





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.