I was having all kinds of issues with my Jeep, until I discovered that the ECM wire harness connector can be wiggled and problems go away. However this is not a cure and eventually problems resurface and connector needs to be adjusted again. Anyone else have this issue and what has been done to resolve it.


The types of problems range from random check engine lights, poor running, limp mode,
Missing a cylinder etc...

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05 Stone White Sport Auto/Selectrac
2.5" Rockfather Lift
2.5" Spidertrax Widening Kit
245 75 R16 BFG All Terrains
ARB Bull Bar W/9000LBS Winch
Multiband Ham Radio antenna W/icom Radio
ORM, EHM, Aftermarket Hoses
K&N Replacement Air filter
Sat Radio but doesn't work in Hawaii...

Coming Soon: Roof Rack, Seat Covers, Mud Mats

Some others have reported similar issues.
They removed the plug, cleaned the pins with some fine sandpaper, sprayed with contact cleaner and some even bent the discolored pins a tiny bit to make better contact.

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Supporting Vendor and Moderator of LOST
05 Jeep Liberty CRD Limited
Ironman Springs/Bilstein/Shocks
Yeti StgIV Hot Tune
Week's BatteryTray
No FCV/EGR
Samcos/ProVent
SunCoast/Transgo
Carter Intank-pmp
2mic.Sec.Fuel Filter
Flowmaster/NO CAT
V6Airbox/noVH
GM11 Bld.fan/HDClutch
IronrockArms/wwdieselMount
98 Dodge Cummins 24 Valve

I have the same issue with mine, I found out some of the pins (one at least) are loose. It makes a misfire on cylinder #2.

The best way I found so far is to put dielectric grease to reduce vibration and make sure the harness is no moving around.