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  #1  
Old 02-16-2015, 12:04 PM
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NV247 Transfer Case low oil/leaking & Misfire

Hello I have a 2000 Jeep Grand Cherokee WJ Laredo 4x4 4.7L Magnum with Quadra-Drive, I just purchased this WJ from an auction and have already started my own maintenance with the help of Wjjeeps.com. Unfortunately right off the bat it threw engine codes for a misfire, codes P0202 & P0302 and it lead to these conclusions: cylinder 2 and an open circuit on injector 2. I removed the spark plug & it looked fine, I checked the spark & that was also working correctly. I need to remove the injector and flip flop it with another from one of the other cylinders along with the coil.

It also has a very low amount of gear oil in the transfer case and it looks like leaked out and made a bloody mess underneath the vehicle. I'm not driving it until I get the correct fluid & amount back in it for the transfer case, but I would like some insight since this is the first time I've owned a Jeep. I have read about other people servicing there NV247 with alternative fluids with FM's, any input would be greatly appreciated! Jake

---------- Post added at 05:47 PM ---------- Previous post was at 05:37 PM ----------







Transfer case leakage.

---------- Post added at 06:04 PM ---------- Previous post was at 05:47 PM ----------

Also it looks as if this wj sat for awhile due to the cobwebs underneath the vehicle....

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  #2  
Old 02-16-2015, 06:39 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

Welcome to the garage.
The NV247 T-case uses special Mopar fluid, which in fact is just Mobil 424 (hydraulic tractor fluid). You will have to check the T-case bleeder to see if its open, otherwise pressure buildup due to warming up will cause the fluid to come out somewhere. You will have to clean the T-case, to be able to find the spot where the fluid is coming out. Could be from the split in the two halves, but also from the drain plug or the drive shaft seals. Especially the rear one, which is a slip fitting. Whith the movement of the rear suspension, the rear propshaft will slide in and out of the T-case, wearing the seal. Friction modifier should not be needed in this T-case and i wonder if it would do any good to the progressive coupler inside the T-case.
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Old 02-16-2015, 08:30 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

T-Case bleeder? First I've heard of that, where is it located on the transfer case? The Mobilfluid 424 I have seen people talking about along with about 5 other alternative fluids that are not Mopar associated. I accidentally talked about the Fm because I had the differentials on my mind, I am going to be servicing them along with everything else. I don't know anything about this vehicle and what maintenance has been done so I don't want to take a chance. Thank you for your help, do you have any suggestions about the misfire?

Jake
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Old 02-17-2015, 07:08 AM
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Re: NV247 Transfer Case low oil/leaking & Misfire

I probably used the wrong word, i ment to say breather. There is a breather connection on the forward side of the T-case where it mounts to the transmission. Follow the hose and see if the end cap is not closed with dirt and if the hose is open.
Regarding the fluid, i would stay with the Mopar stuff or Mobil 424 (both the same). Eventhough other fluids will not damage the T-case, they can cause clutch chatter in the progressive coupler. (for this reason the original ATF+4 fluid was changed somewhere in 99 to the Mobil 424).
Regarding the misfire i think you are on the good track. The misfire is caused by a non functioning injector. Could be the injector, wiring or PCM. You could do some initial checks on resistance of the injector and voltage on the injector connector. Resistance normally is in between 13 and 15 Ohms. If it 0 or much higher, then you can be sure that that injector is bad.
To check for voltage, you need to check pin 2 from the respective connector to ground. The ignition must be in run and you have three seconds to check, because the PCM will deactivate the auto shutdown relay after 3 seconds when the engine doesn´t run. So you will need a helper to do this.
If all this is well, you can swap the injector with an other position or put it on a tester. It can be that it is clogged.
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Old 02-17-2015, 03:21 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

Hoping the injector is clogged, found one on amazon $29 if it's dead. If in fact is clogged can it be unclogged with a cleaner, Or solvent? Sorry for all the questions, I'm coming from a 1987 Suzuki Samurai which has been modified to the point of no sensors a VW 1 barrel carb and full roll cage with just the frame welded onto it. Thank god I'm not dealing with a 2015 model is all I can say... Thank you once again Frango!


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Old 02-17-2015, 04:35 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

If it is clogged, then most probably best is to put it in an ultrasonic bath, the one used for injector cleaning. A repairshop will have this equipment.
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Old 02-18-2015, 12:13 AM
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Re: NV247 Transfer Case low oil/leaking & Misfire

Alright thank you once again, changed out the fluid on T-Case & found out the fluid within that I drained completely and it was red!! The Mopar fluid was a clear colour, right after I finished it started it up and selected gears. I drove it around my house & it was shifting smooth compared to hard & without lunging.... Glad I changed it. Also I found the breather and need to investigate it further as I couldn't see it, only feel it.
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Old 02-18-2015, 04:50 AM
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Re: NV247 Transfer Case low oil/leaking & Misfire

Strange that the fluid inside was red, because the fluid that leaked out seemed to be clear. Maybe that the previous owner had put some kind of ATF in there.
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Old 02-24-2015, 07:22 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

I know it's kinda confusing, I've also noticed a lot of noise when turning left or right when in 4L. Driving down my dirt+rock 4x4 only road to my home. Hoping it's not my power steering but the wrong fluid in the differential.
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Old 02-24-2015, 08:24 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

I would first see if changing the diff fluid with fresh one with friction modifier will resolve this. Could eventually be play on one or both cv joints from the drive shafts.
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Old 02-24-2015, 09:07 PM
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Re: NV247 Transfer Case low oil/leaking & Misfire

The C.V joint boots have been replaced and regreased when I bought the vehicle and it wasn't popping before it had been done. By my friend/landlord.
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