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Old 12-17-2014, 09:11 PM
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engine warm up time, engine shutdown, idling time and more

Hello everyone, after being owner a new GC for less than 2 days, many questions poping up from my mind while reading the included user manual.

1- How long should you wait for engine to warm up before driving?
2- How long should the engine run idle after 30 minutes drive. before you yurn it off?
3-Comparing to gas engines, it seems that you should not have the diesel engine idle for a while.
4- Has anyone be able to test the forward collision warning system? I tried a couple of times mine, however I was worried to hit the car in front before trusting the feature to do that.

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Old 12-17-2014, 09:44 PM
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Re: engine warm up time, engine shutdown, idling time and more

1 & 2 are answered in the DIESEL SUPPLEMENT Owners Manual you should have.
If you don’t have it, download it from here and have a read - Jeep Owners | Download an Owners Manual 2004 - 2011 | Jeep
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Old 12-17-2014, 09:48 PM
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Re: engine warm up time, engine shutdown, idling time and more

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Originally Posted by Olivia_2015 View Post
Hello everyone, after being owner a new GC for less than 2 days, many questions poping up from my mind while reading the included user manual.

1- How long should you wait for engine to warm up before driving?
2- How long should the engine run idle after 30 minutes drive. before you yurn it off?
3-Comparing to gas engines, it seems that you should not have the diesel engine idle for a while.
4- Has anyone be able to test the forward collision warning system? I tried a couple of times mine, however I was worried to hit the car in front before trusting the feature to do that.
1. I never wait. I usually drive it gentle for the first few miles. Idling is not recommended for diesels and as diesels are such efficient engines they take forever to warm up if you do not let them work.

2. This is done mostly to let the turbo cool down after a major engine load. You shouldn't be concerned about that during daily commute and light usage. Usually driving off the highway and finding a parking spot is more than ample to cool and properly lube the turbo. If you do some heavy lifting such as up-hill towing etc and stop abruptly, you should follow the recommendations given in the Diesel Supplement and let the engine idle for a few minutes before shutting down.

3. Correct. This is mostly a result of our very restrictive emissions system. Idling creates excessive soot and does not allow the engine to initiate regen cycles to clean the DPF. Too much idling can quickly get you to a clogged DPF and limp mode.

4. It sure does. FCW sometimes false triggers on a left bending road when the vehicle in-front of you makes a right turn. You know that the turning car will never cross your path, but the radar still sees it as a threat. Give it a few weeks and you will experience it.
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Old 12-19-2014, 11:40 AM
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Re: engine warm up time, engine shutdown, idling time and more

Hi Olivia, good advice above. We tow with our Jeep and I always let it rest before turning it off, especially after being on the highway.


Have you tried the Adaptive Cruise Control yet? Using this will definitely get you feeling confident about the "Tech" in your Jeep, especially the FCW.


My wife was, like yourself, a little unsure about trusting the systems. Now, after 13000 miles in the GC, she uses it all the time. Once you gain confidence in the ACC and FCW systems, it definitely makes the driving more relaxing, especially in traffic.
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Old 12-19-2014, 01:07 PM
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Re: engine warm up time, engine shutdown, idling time and more

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Originally Posted by Olivia_2015 View Post
4- Has anyone be able to test the forward collision warning system? I tried a couple of times mine, however I was worried to hit the car in front before trusting the feature to do that.
The best way to get a FCW false alarm is to set it on "Far" (rather than "Near") and drive slowly behind someone who is turning off into a side parking lot. It will be obvious to you that the other driver will be well clear of your lane before your vehicle gets to that location, but FCW doesn't believe that. This scenario happens often enough that I put FCW on "Near" so I don't have to step on the accelerator to power through these recurring FCW false alarm freakouts.

Heh, FCW has even freaked out on me in that scenario with ACC engaged; that's a bit schizophrenic I feel.
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Old 12-19-2014, 01:35 PM
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Re: engine warm up time, engine shutdown, idling time and more

One thing I'm curious about is when using the adaptive cruise and it slows down the vehicle does the brake lights come on to warn others. Not talkn about when fwc kicks in. Just talkn about when it slows down. I have had a few cars almost slam into me.
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Old 12-19-2014, 05:11 PM
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If the acc can slow you down enough by just cutting off the accelerator then it will do that. If it has to slow down quicker than what coasting will provide, it will apply brakes and illuminate your brake lamps. I wondered the same thing at first, but was able to confirm after towing my boat and seeing the reflection.
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Old 12-19-2014, 05:56 PM
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Re: engine warm up time, engine shutdown, idling time and more

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Originally Posted by MuSh View Post
If the acc can slow you down enough by just cutting off the accelerator then it will do that. If it has to slow down quicker than what coasting will provide, it will apply brakes and illuminate your brake lamps. I wondered the same thing at first, but was able to confirm after towing my boat and seeing the reflection.
From the owner's manual:

==============>8=================
NOTE: The brake lights will illuminate whenever the
ACC system applies the brakes.
==============>8=================
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Old 12-19-2014, 11:12 PM
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engine warm up time, engine shutdown, idling time and more

I'm glad to see the owner's manual agrees with me. If it needs to apply the brakes, they will illuminate. Applying the brakes is not always necessary to slow down and the ACC is smart enough to simply decelerate, which will not illuminate....exactly the same result if you were doing it manually.
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Old 12-20-2014, 08:55 AM
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Re: engine warm up time, engine shutdown, idling time and more

Olivia, the collision warning system has the potential to be incredibly useful. It actually saved me from nearly rear-ending a car that suddenly came to a complete stop for no apparent reason. I was a bit distracted—trying to use the Navigation system for the first time—but the warning and braking got my attention very quickly!

I also absolutely love adaptive cruise control. It's so much more useful than standard cruise control.
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Old 12-20-2014, 09:35 AM
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Re: engine warm up time, engine shutdown, idling time and more

Thanks everyone. I hope mine is working. Even if it is set to "far", it never shows me any warnings even if I am getting too close to the car in front while driving. ACC is working though. I have tested that one and I love it.
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Old 12-20-2014, 09:52 AM
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Re: engine warm up time, engine shutdown, idling time and more

Getting the FCW system to warn with beeping and shuttering happens every once in a while for me also as others have described above with a turning car in front. The next step of having it actually apply substantial additional braking is something you can not safely test. It is something that happens in a panic near collision situation. If you are on the brakes and it thinks your not braking hard enough for the situation it will add additional braking for the situation to try and lessen or prevent collision. In over a year and a half I have only had that additional braking happen once which was a very near collision situation of screeching tires and antilock brakes chattering. After misjudging slowing traffic I had just started to brake but not nearly enough and it stood on the brakes fairly hard and I was able to stop. You need to be on the brakes somewhat to get the extra braking assistance, if you are on the gas all its going to do is beep and shudder and shake and try to warn you to start braking, don't confuse the mild braking/shuttering warning with actual hard braking the system can do. as soon as you touch the brakes and it determines that your intentions are to stop the car and you are not doing enough it will do what it can to help get the car stopped. Its a white knuckle oh shit moment and not a situation you ever want to be in let alone try and test lol. Other than the occasional false alarm of a turning car in front it works well IMO a little added help for those situations you hope never happen.
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