05/30 Q/A Session - 2005 - 2007 Grand Cherokee - Page 4 - JeepForum.com
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Unread 05-30-2007, 04:41 PM   #46
oH2o
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How critical is running the recommended 5w-30 oil in the MDS Hemi? I understand that operation of the MDS may be affected and it may not engage as often, but is there any "harm" caused by running a different weight oil?

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Unread 05-30-2007, 04:42 PM   #47
Colo.kid
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I have an 05 and have had 3 failures of my power steering unit. Have there been any design changes 06-08 relative to this unit so it can better handle the cooling demands of the hydraulically-driven fan as well as steering?

Thanks for taking the time to interact with us like this--it is really appreciated!
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Unread 05-30-2007, 04:42 PM   #48
shugs
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How long (miles) have the WK test Jeeps lasted so far? Does the current maintance schedule for an 06 Overland seem to be right on or do I need to do more maintanance if I want to keep this Jeep for another 50,000?

Currently I'm at 29000 and have not done any maintanence besides oil changes.
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Unread 05-30-2007, 04:42 PM   #49
JeepEngineers
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Quote:
Originally Posted by oH2o
A lot of 2005-2006 owners would love to have the rear camera feature that was introduced in the 2007 models. One owner bought the 2007 version REC nav radio, the camera and all wiring harnesses, and hooked it up exactly as the '07 diagrams show - but no go, the camera image will not display. Is this something that would be impossible to retrofit or can something in the Bus system be programmed?
Thanks for the interest. We are working towards this feature being progammable at your local Jeep dealership. The owner you mentioned was on the right track! In order for the Camera to work, first you must have the proper REC radio (NAV Radio) ,the proper harnesses, and the rear camera. Then the vehicle must be programmed that it has been equipped with a Rear Camera using the dealer scan tool. However, at this time this is not a dealer programmable feature. Please check with your local Jeep dealer later this year.

Thanks Again!
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Unread 05-30-2007, 04:43 PM   #50
InIt4TheFun
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Is there any way to turn off the Tire Pressure Monitoring System?

Even if temporarily until I turn the engine off.

Thanks
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Unread 05-30-2007, 04:44 PM   #51
GoGadgetWK
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Thanks for anwering questions. I live in Colorado where a lot of Off road trails require clearance to get through them with out damaging the body. Why did you not make it possible for people to lift the vehicle and add bigger tires from the factory when the 05 Grand came out?
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Unread 05-30-2007, 04:46 PM   #52
JeepEngineers
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Quote:
Originally Posted by oH2o
How critical is running the recommended 5w-30 oil in the MDS Hemi? I understand that operation of the MDS may be affected and it may not engage as often, but is there any "harm" caused by running a different weight oil?
Thanks for the question - It's actually 5W-20, and as you noted, it is critical if you want to maximize MDS activation and fuel economy. We use an oil pressure and oil temperature sensor to extrapolate oil viscosity, so the system knows if you use a thicker oil and will react accordingly.

As far as actual "harm", no you won't harm anything. Modern 5W-20 oils generally have semi-synthetic base stocks to achieve the low pour point and cold viscosity, so you don't give up anything to a 5W-30 in terms of protection.
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Unread 05-30-2007, 04:47 PM   #53
blankster
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Question Regarding Exhaust Sound

We own an '07 Overland and really like it a lot - Much improved over the '04 LTD we owned before. Looking forward to a long road trip. The question I have is under certain conditions (light throttle) the exhaust sounds like there is a leak (my wife noticed it). Is this normal? Is this unique to '07s?
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Unread 05-30-2007, 04:48 PM   #54
JeepEngineers
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Quote:
Originally Posted by GoGadgetWK
Thanks for anwering questions. I live in Colorado where a lot of Off road trails require clearance to get through them with out damaging the body. Why did you not make it possible for people to lift the vehicle and add bigger tires from the factory when the 05 Grand came out?

It is possible to lift a 05 WK Grand Cherokee. Superlift offers a kit.
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Unread 05-30-2007, 04:48 PM   #55
joejeep15
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Why was select-trac not an option on the WK line up. I found that this option had put Jeep head and shoulders above the crowd for many years in the past. QT I is a poor replacement.
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Unread 05-30-2007, 04:49 PM   #56
JeepEngineers
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Quote:
Originally Posted by blankster
We own an '07 Overland and really like it a lot - Much improved over the '04 LTD we owned before. Looking forward to a long road trip. The question I have is under certain conditions (light throttle) the exhaust sounds like there is a leak (my wife noticed it). Is this normal? Is this unique to '07s?
You may be hearing the engine in 4 cyl mode when MDS activates...most people can't hear it, but of course JeepForum members aren't most people!

You can always have it checked by your Jeep dealer, but based on your description, I'm fairly confident you are simply hearing the engine in 4 cyl mode.
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Unread 05-30-2007, 04:51 PM   #57
JeepEngineers
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Quote:
Originally Posted by InIt4TheFun
Is there any way to turn off the Tire Pressure Monitoring System?

Even if temporarily until I turn the engine off.

Thanks
Thanks for your question. In the last few years it was mandated that all SUV vehicles be equipped with a tire pressure monitoring system (TPM). Because of this requirement you cannot disable the TPM system.

Keep on Jeepin,
Brian
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Unread 05-30-2007, 04:53 PM   #58
blankster
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Quote:
Originally Posted by JeepEngineers
You may be hearing the engine in 4 cyl mode when MDS activates...most people can't hear it, but of course JeepForum members aren't most people!

You can always have it checked by your Jeep dealer, but based on your description, I'm fairly confident you are simply hearing the engine in 4 cyl mode.

I only notice the sound when the windows are open and the speed is about 25 - 30 and the RPM are low.
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Unread 05-30-2007, 04:54 PM   #59
JeepEngineers
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Quote:
Originally Posted by blankster
I only notice the sound when the windows are open and the speed is about 25 - 30 and the RPM are low.
Yup, that sounds like MDS/4 cyl mode. You want to hear that sound - it means you're getting better mileage!
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Unread 05-30-2007, 04:54 PM   #60
CEPCNC
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Quote:
Originally Posted by GoGadgetWK
Thanks for anwering questions. I live in Colorado where a lot of Off road trails require clearance to get through them with out damaging the body. Why did you not make it possible for people to lift the vehicle and add bigger tires from the factory when the 05 Grand came out?
Superlift and BDS 4" lifts, Daystar 2-2.5" lift, RockKrawler 3-3.5" lift, Rusty's Offroad a 'claimed' 4.5" lift
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