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Topic Review (Newest First)
02-17-2012 01:36 PM
LJDan On the distributor topic...look up opda on here and jf and learn the procedure to pull and inspect. It is known to us 05 and 06 guys as the oil pump drive assembly that is located on the passenger side of the motor right where you would expect to see a distributor. They are poorly designed and improperly lubricated and have been known to fail and cause major damage if you don't keep on top of them. If your jeep is an 06, check it immediately b/c that could be what is causing your problem.
02-17-2012 12:47 PM
UnlimitedLJ04
Quote:
Originally Posted by redneckpilot View Post
Also, I thought that throttle bodies were something specific to single point injection systems. Learning more every day.
all the throttle body does is meter the air that the engine gets. basically the same thing the throttle blades on a carb do. so if your silverado was a gas motor which wasn't carb'ed, it had a throttle body. some diesels even have throttle bodies now...

if fuel injected, where & how the fuel is injected determines whether its SFI, MPFI, TBFI, etc. In the case of the Jeep 4.0L, it's MPFI, so each cylinder has it's own fuel injector, and fuel is injected into the intake manifold adjacent to the combustion chamber.
02-17-2012 11:54 AM
redneckpilot Also, I thought that throttle bodies were something specific to single point injection systems. Learning more every day.
02-17-2012 11:41 AM
redneckpilot I've raised the hood, and been under her several times. Apparently I need those glasses checked, because I guess I was looking for something different, more like what my Silverado had. Didn't mean to come off sounding like a smartass. Live and learn.

On a separate note, somebody gave me good advice once to clean out the throttle body when I do a tuneup - I think I'll take them up on that.
02-16-2012 08:35 PM
tangofox007
Quote:
Originally Posted by redneckpilot View Post
Thought the '06 was fuel injected, if there's a throttle body on it, I may wanna go get my glasses re-checked, because I haven't seen one yet.
What did you see? Or have you not raised the hood yet?
02-16-2012 08:07 PM
cntryboy232 im about to hit 100000 on mine and going to flush the whole system. Other than that and spark plugs i dont know what else to do.
02-16-2012 05:12 PM
UnlimitedLJ04
Quote:
Originally Posted by Rpkittle View Post
If it doesnt have a distributor, what does it have? and how does it function differently?
The new 4.0L's all have coil packs. Three coils packs on the rail if I remember correctly. Cam position and timing is handled by the cam position sensor and the PCM.

Quote:
Originally Posted by redneckpilot View Post
Thought the '06 was fuel injected, if there's a throttle body on it, I may wanna go get my glasses re-checked, because I haven't seen one yet. It is about that time for my yearly check anyway
All the TJ's are multi-point fuel injected, and do have throttle bodies. The 05-06 use a different throttle body than 97-04.
02-16-2012 05:08 PM
redneckpilot Thought the '06 was fuel injected, if there's a throttle body on it, I may wanna go get my glasses re-checked, because I haven't seen one yet. It is about that time for my yearly check anyway
02-16-2012 12:24 PM
DuruConsigliere Just a added note. When you do your tune up you may want to clean up the Throttle Body. Just a thought.
02-16-2012 12:16 PM
Sccafire Basically, it is all done by the pcm and several sensors.
02-16-2012 12:01 PM
Rpkittle If it doesnt have a distributor, what does it have? and how does it function differently?
02-16-2012 11:28 AM
MechanicJay
Quote:
Originally Posted by UnlimitedLJ04 View Post
coil packs are replaced when they go bad. they don't go bad very often.
+1

Mine just went bad, the symptoms:

Ignition breakup at high rpm (3500+)
Arcing sound coming from the rear most coil pack -- internal arc, could only hear it with the hood up.
Random misfires when cold.
High-load, low RPM hesitation (such as from a stoplight).

No codes thrown.

It runs 100% better with the new coil rail.
02-15-2012 10:31 PM
UnlimitedLJ04 coil packs are replaced when they go bad. they don't go bad very often.

change all your fluid too...tranny, engine, power steering, brake fluid, diffs, t-case...grease the ball joints, steering, u-joints in the driveshafts (may require removing driveshaft)...etc.
02-15-2012 10:25 PM
redneckpilot
Distributorless 4.0L Tuneup

I started tonight knowing that if I just posted a question about the tuneup for my 06 TJ 4.0L without doing research I'd be told "use the search function". So I did. Still have questions though.
  • So I get that I don't have a distributor - Awesome
  • I found out that I want dual tipped platinum plugs, Autolite APP985 was what I think Jerry recommended on a previous page.

But my question is how often do I have to replace the rail/coil packs that provide spark to the plug?

I'm about to hit 50k on my baby, and its starting to do that I-don't-care-I-want-a-tuneup-or-I-will-randomly-kill-starting-out-from-the-stop-sign dance that only a cold engine in dire need of a tuneup does. I don't like that dance, it makes me angry. So this weekend is going to be tuneup time.

Also, is there anything else that I should know about doing a tuneup on an '06 TJ that would differ from my chevy pickups I've done in the past? Any gotchas?

Thanks for the help!

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