By flicker what do you mean?
Iím working on trouble shooting a car right now that has what the driver calls a flicker, what it does is the dash lights and headlights slightly dim and come right back. We are looking at the battery and alternator, which can be tested. Also considering the multifunction switch (headlight switch) and body grounds. Itís not a Jeep but troubleshooting is similar.
Not sure what Year and engine commander you have, in this app I donít see anything but the main post.
On our 2006 3.7 Commander Iíve noticed at stoplights lower RPM and almost a stall, then it self corrects. There does seem to be a electrical component, like maybe a dip in alternator voltage, however Iíve replaced: alternator, battery, ground straps, ignition coils, crank and cam position sensors (with mopar ), headlight switch, flushed transmission fluid, and randomly itíll still do the rpm drop and recovery at a stop light. Headlights, A/C, blower motor, rear air, nothing actually seems to contribute.
Itís a common problem to these years jeeps.
The alternators on the commanders are pretty high output so it really shouldnít be a demand problem unless the PCM is not adjusting the voltage correctly.
Transmission fluid level fixes the issue for some, or they say it does, theory is the torque converter needs proper amount of fluid to spin freely at idle. A few have said bad transmission or torque converters were their problem.
Another of the theories is weak CPS signal causing the PCM to do something that causes this. It wasnít so in my case.
I donít know, what I think contributes is the rpm is so low, 550, that slight changes can affect it more noticeably than in other vehicles with higher rpm at idle.
Not sure how bad your flicker is, depending on how bad it is it might suggest a place to start. Otherwise the trouble steps shooting I listed we are doing for another car are a good place to start. I wouldnít replace all the parts I did, some of it was to troubleshoot this issue but most of it was in the course of general maintenance..
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