Ok, so I promised this a little while ago. It took several hours to compile the information, but here it is.
Welcome to Jeepforum.com's WK2 Technical Section! This is the place for 2011 to current model Jeep Grand Cherokees.
This introduction is designed to help you get familiar with the ins and outs of your Jeep, show you the ropes for this forum, and hopefully answer some basic questions.
This place is THE place to find out about your WK2. Whether troubleshooting, upgrading, or learning about how your Jeep works, you'll get plenty of insight here. The following is a sort of "How to..." for the forum. It is broken down into sections and includes links to threads that cover some of the more common information.
Forum Basics
Your Profile- All registered accounts come with a profile page. Your profile lets you tell a little about yourself, but more importantly, about your Jeep. A completed profile will help other members know what hardware you are dealing with when attempting to solve any problems you post.
Not sure what equipment came on your Jeep from the factory?
Request a Build Sheet, it's FREE.
SEARCH Function- I cannot stress enough how important it is to SEARCH this forum for answers before starting a new thread. This forum will be around for a long time and countless topics have been/will be discussed multiple times. If you do not find what you're looking for after running a search, change your wording and search again, and again, and again. Google is a great tool as well.
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Here is a detailed tutorial on getting the best possible results from your search.
The "Dead Horses"- "Don't beat a dead horse." Many topics on this forum are considered dead horses that the majority of members are tired of discussing. This is not currently a problem, but these topics tend to clutter Page 1 of forums and can cause more serious threads to be overlooked. They also waste storage space, which slows down the forum and hassles the webmasters. Every one of these topics can be answered by way of the SEARCH function.
If you do "Beat a Dead Horse" by starting a new thread, take cover. Which brings us to the next point...
Don't Banter- You may get an answer you didn't want to hear, or a comment that you felt was offensive. As Chris Rock would say: "Let it slide"
There are forum guru's and all around helpful guys, just take criticism with a grain of salt. No need to be quick to defend yourself or attempt to insult the poster. Honestly, they don't really care.
This thread is the perfect example of what NOT to do:
Best/cost efficient way to gain HP and gas mileage
Additional Information:
Rules and Guidelines
RE BB SYE ACC BL CV Whaaaa?
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Here is a list of common Acronyms and Abreviations used in the Technical section. This guide doesn't apply that much yet to this forum, but as time goes on, unique acronyms that apply to WK2s will come out of the woodwork.
Show us your rig!
Want to show off your brand spankin' new mod or new purchase? Do it here:
http://www.jeepforum.com/forum/f309/...hread-1081793/
Product Reviews by Forum members: This section is a community effort where members can add a review for any product they have purchased or give a quick review of any product already listed. This gives members a chance to help fellow Jeepers out by warning others what products are a waste of money, or finding products that exceed expectaions -
http://reviews.jeepforum.com/
General Offroading: This thread list, compiled by Unlimited04, covers tips and techniques for all kinds of terrain.
Offroad Tips and Techniques
Useful/Informative Threads
I will start to compile useful threads containing write-ups or various bits of information on how various components work in this section.
Technical Information:
MDS Information/History:
http://www.jeepforum.com/forum/f309/...works-1176294/
WK2 4x4 How it Works:
http://www.jeepforum.com/forum/f309/...stems-1177616/
Not So Technical, but Still Useful:
Easter Eggs... Cool features not everyone knows:
http://www.jeepforum.com/forum/f309/...-eggs-1230910/
Maintenance
I am only covering information for the 3.6L Pentastar and 5.7L Hemi because the 3.0L V6 diesel is not available in North America.
Oil Changes
The WK2 has an oil change indicator system. This system displays a “Oil Change Required” or “Oil Change” message at appropriate intervals on the instrument cluster. The Oil Change Indicator system uses the Powertrain Control Module to process a variety of inputs and then decides on an oil change interval. The factors which point toward severe use include the following:
* Ambient temperature inputs which indicate extended periods of low temperature operation
* Average vehicle speeds which indicate stop-and-go driving
* Run time which indicates prolonged idling
* Trip lengths and coolant temperatures which indicate short trips
* Engine RPM and engine loads which indicate trailer tow usage
* Fuel indications of an ethanol percentage of 60 percent or greater
The oil change indicator can be reset using the following steps:
1. Turn the ignition key to ON but do not start the engine. If you have the push button start, press the button twice with the key in the vehicle and your foot
OFF the brake.
2. Slowly depress the accelerator to the floor and release it three times within 10 seconds.
3. Turn the ignition key to the OFF position (or press the push button to turn OFF).
Repeat the process if the indicator does not reset.
Please note, the oil must be changed either when the indicator message appears or when the maintenance interval occurs (whichever occurs first).
3.6L V6 Pentastar:
Capacity: 6 Quarts (with Filter)
Type: 5W-30 API Certified
Oil Pan Torque Spec: 25 ft. lbs./34 N·m
Change Interval: Highway Use - 8,000 miles 6 mo. Severe Use - 4,000 miles 3 mo.
5.7L V8 Hemi
Capacity: 7 Quarts (with Filter)
Type: 5W-20 API Certified
(Note: It is important to use only 5W-20 oil for proper operation of the Multiple Displacement System. Use of other weight oils will affect the on/off timing window of the MDS system and may also result in unbalanced engine wear).
Oil Pan Torque Spec: 20 ft. lbs./27 N·m
Change Interval: Highway Use - 8,000 miles 6 mo. Severe Use - 4,000 miles 3 mo.
Transfer Cases 4WD and AWD only
Service for the transfer cases is an inspection. The fluid is considered lifetime and should only be replaced when necessary. The listed interval is when the fluid should be inspected.
MP3010 Quadra-Trac I
Capacity: .51 Liters (1 Pint)
Type: ATF approved to MB 236.10, MB 236.12, such as Shell ATF 3403*
Drain Fill Plug: Unknown Torque Spec
Interval: 30,000 miles 36 mo.
*From what I can find, this is a proprietary fluid by Mercedes Benz made by Shell. It is a fully Synthetic fluid.
MP3023 Select-Trac 2
Capacity: 1.90L (4 Pints)*
Type: ATF +4
Drain Fill Plug: 15-25 ft.-Lbs
Interval: 30,000 miles 36 mo.
*Fill to bottom edge of the fill plug hole.
Transmissions
Note: Do not use additives in your transmission fluid. Claims made by these manufacturers have not been supported to the satisfaction of Chrysler and could jeopardize the integrity of seals.
W5A580 (3.6L Pentastar)
Capacity: Service - 4-6 Quarts. Overhaul - 9.5-10 Quarts.
Type: ATF +4
Interval: Highway - 100,000 miles Severe - 60,000 miles
545RFE (5.7L Hemi)
Capacity: Service - 2WD 5.5 Quarts 4WD 6.5 Quarts. Overhaul - 14 Quarts
Type: ATF +4
Interval: Highway - 100,000 miles Severe - 60,000 miles
Air Filter
Note: High flow filters do allow more air for the engine, but they also provide less protection This higher flow comes at the cost of protection because they allow larger dust particles in the engine.
3.6L Pentastar
Filter: MoparŪ p/n 4861756AA
Interval: Highway - 32,000 miles 24 mo. Severe/Dusty - 16,000 miles 12 mo.
5.7L Hemi
Filter: MoparŪ p/n 5018777AB
Interval: Highway - 32,000 miles 24 mo. Severe/Dusty - 16,000 miles 12 mo.
Spark Plugs
Note: The 3.6L Pentastar is Chrysler's first engine to use 12mm Spark Plugs. Over-torquing them can cause improper heat transfer which can induce pre-ignition. This pre-ignition can cause engine damage. The 5.7L Hemi uses a torque critical tapered design. Do not over-tighten these either.
3.6L Pentastar
Plug Count: 6
Gap: .040
Torque: 13 ft. lbs.
Type: MoparŪ p/n SP149125AD (Champion R8ZWYCB4)
Interval: 96,000 Miles
5.7L Hemi
Plug Count: 16
Gap: .040
Torque: 13 ft. lbs.
Type: MoparŪ p/n SLZFR5C11 (NGK ZFR5C11)
Interval: 30,000 Miles
Throttle Body Cleaning
The throttle body
CANNOT be cleaned. Don not use spray cleaners or apply silicone lubricants to any part of the throttle body. These types of products can damage the throttle body components. The throttle body has no serviceable components and is replaced as an assembly. It should last the life of the vehicle.
Engines
3.6L V6 Pentastar
The 3.6L V6 Pentastar engine is designed to run efficiently on 87 octane gasoline. The use of premium fuel is not recommended for use in the 3.6L Pentastar engine, and in some instances can result in decreased performance and economy. I can not confirm the use of E85 in every Pentastar, however, it looks like it is safe for all 3.6L engines. The 3.6-liter V6 engine delivers 290 horsepower (216 kW) at 6,350 rpm and 260 lb.-ft. (353 N•m) of torque at 4,300 rpm, an increase of 38 percent in horsepower and 11 percent in torque over its predecessor, while providing customers up to an 11 percent improvement in fuel economy. The Pentastar V-6 is designed to run on regular gasoline, offering a 10 percent reduction in fuel cost compared with premium fueled engines. The engine’s torque exceeds 90 percent of its peak value from 1,600 to 6,400 rpm, which provides customers with outstanding drive-ability and responsiveness. Power Graph:
5.7L Hemi
The 5.7L Hemi is tuned to run most efficiently on 89 octane fuel. While this fuel is recommended, use of 87 octane fuel will not cause damage and can be safely used in the 5.7L Hemi. As with the 3.6L Pentastar, use of premium fuel is not recommended and can result in poorer performance in some instances. Unlike the 3.6L, use of E85 is not acceptable in any case. This fuel can cause damage to the engine and other various components. The all-new 2nd generation 5.7-liter HEMI V-8 Eagle engine offers better fuel economy, improved idle quality and overall refinement, along with more horsepower and torque. HEMI has always been synonymous with power, and now - thanks to VVT, expanded four-cylinder mode in the MDS system, and a host of other technologies - Chrysler's new HEMI delivers more fuel efficiency and refinement, along with even more power. Other enhancements include an increased compression ratio and an active intake manifold with long runners for low-end torque and short runners for high-rpm power. For the 2011 model year, the 5.7L produces increased power and torque over the previous model, delivering 360 horsepower (268 kW) and 390 lb.-ft. of torque (520 N•m) @ 4,250 rpm and features Variable-valve Timing (VVT) and fuel-saving MDS technology with dual exhaust to maximize efficiency.
I will update this as more information becomes available and when I have time. If there are requests for specific things, I will also work on that. I will also write a section that outlines the operation of the 3 different 4wd systems, MoparŪ accessories, aftermarket upgrades (such as exhausts, tuners, lifts), tire sizes, rims, and anything else I/others can think of. If you have something that you would like included, shoot me a PM. If you have information on that item, it would make my part much easier. I would also love a FSM when it becomes available to help expand this section. I will include links to write-ups when they become available.
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WK2 FAQ and Basic Info Compilation
I tried to find as much info as possible to accurately describe what is going on. Took longer than I thought. Here is the link:
