Rough Idle at cold start-up after GDE ECO tune...

painemann · **Joined:** Sat Dec 20, 2008 7:02 pm **Posts:** 607

I got the GDE ECO tune a few months ago and I noticed that after a cold (ambient) start it the CRD will have a rough idle, it actually feels like a miss. Now I haven't contacted Keith at GDE yet just because of the fact that I'm not sure its the tuning issue, so I waited until I replaced the glow plugs and replaced the timing belt to see if the issue improved.... It did not! Any other ideas? The only thing I can think to do is to have GDE return the jeep to the stock tune and see if the issue is still there.

Thanks.

dieseldawg · **Posted:** Wed May 11, 2011 10:15 am

I have a similar issue as well. I've noticed on cold start-up that I get a stumbling that feels like a miss or that something is cycling on and off again. About every 3 to 4 seconds. After driving just a little bit, the stumbling and fake miss go away and it runs perfectly fine. I have not pulled the relay for the viscous to see if that takes care of the issue. I do know that the viscous heater is running because once the temperature gauge hits that quarter mark, I get a surge of power.

sidebrake · **Posted:** Wed May 11, 2011 10:17 am

Yep, I've got it too. It was definitely more pronounced in the winter months, but even now, until the engine warms up a bit, the idle does not sit perfectly still.

It definitely started after the Eco tune. It hasn't cased any problems (that I'm aware of) so I haven't asked GDE about it either.

Edit: to comment on dieseldawg's post ... I have my viscous heater relay pulled, so it's not that in my case anyway.

GreenDieselEngineering · **Joined:** Sun Jun 07, 2009 5:10 pm **Posts:** 1111

This is a known issue and relates to the injection parameters between cold engine and warm engine. During the coolant warm-up the injection is going from twin pilot to single pilot. During this time (about 3-5 minutes or so) the idle governors can cause a rolling idle due to the injection characteristics. The only way to eliminate this is to change the injection parameters during cold coolant conditions and may have a negative impact on start ability. The rolling idle will not cause any issues with the powertrain and is completely gone when the coolant reaches about 140 F. Hopefully this eases your concerns.

papaindigo · **Posted:** Wed May 11, 2011 11:20 am

I imagine this is more a "northern" issue as I've not noticed it down here where anything below freezing is fridged.

sidebrake · **Posted:** Wed May 11, 2011 11:47 am

Thanks for the explanation. Personally, it's never been a concern for me, but more of a curiosity.

painemann · **Joined:** Sat Dec 20, 2008 7:02 pm **Posts:** 607

Thanks for the info Keith. it dosen't bother me much, as long as it isn't hurting anything or something else I have to fix!

dieseldawg · **Posted:** Wed May 11, 2011 3:53 pm

Thanks Keith! I really appreciate you letting us know about this. Saves me a ton of time troubleshooting. Loving the ECO Tune, btw!

chrismc · **Posted:** Thu May 12, 2011 11:18 am

I've noticed this too, but didn't worry too much about it since it didn't seem to cause any problems. I'm glad to hear from GDE that it is behaving according to spec, and will not cause issues.

camo · **Posted:** Fri May 13, 2011 1:56 am

How do I get an eco tune? is it a module? programming? can it be removed any time? will it caused the CEL to turn on? I have an 05 CRD with 88k miles, and has fuel warmer on the tank and fuel lines install by the past owner for a reason that I still don't understand ( the libbie its always been in Houston TX) any way, I saw that the guys that does it post here but all help is most appreciated. :dizzy:

camo · **Posted:** Fri May 13, 2011 2:39 am

Ok, I just found the website for GDE and read it. however, I still have some questions. will the CEL still working normally? can I use the provent and SEGR moods with the eco tune? what would be the best tune for me or better phrase, how do I make that decision. I found performance charts on the website but didn't see anything talking about trailer towing conditions, or desert like conditions in the middle of the summer like in south Texas combine with lots of daily driving, should I call the contact number and discuss it directly with the GDE guys or is there another website to obtain more info? also, will the fuel heaters install on my fuel system have to be disable or it won't matter?
thnx :dizzy:

sidebrake · **Posted:** Fri May 13, 2011 7:38 am

camo wrote:

Ok, I just found the website for GDE and read it. however, I still have some questions. will the CEL still working normally? can I use the provent and SEGR moods with the eco tune? what would be the best tune for me or better phrase, how do I make that decision. I found performance charts on the website but didn't see anything talking about trailer towing conditions, or desert like conditions in the middle of the summer like in south Texas combine with lots of daily driving, should I call the contact number and discuss it directly with the GDE guys or is there another website to obtain more info? also, will the fuel heaters install on my fuel system have to be disable or it won't matter?
thnx

CEL works as you want/need it to work. Provent or EHM would still be recommended with a GDE tune, since the CCV is not computer controlled... you still need a solution to keep oil from entering the intake. SEGR should not be necessary in theory, but I've heard of some running both.

I can't comment with first hand knowledge on your other questions... but I can tell you that there are members using GDE tunes all over the country in various weather conditions with great success. There are also many who say the extra torque is helpful for towing. Although, if you have a stock torque converter, you'll want to stick with the Eco tune.

boilermaker2 · **Posted:** Fri May 13, 2011 9:09 am

I did my correspondance with the GDE team via e-mail. I think I was involved in a group purchase but I forget, I've been enjoying it for almost a year now.

Make sure you get the unlimited torque version of EcoTune. If you have not beefed up your TC, you will likely need to one day.

I've consistantly gotten a 2mpg increase and even more in some circumstances. For me, 22k miles per year, the software change will pay for it itself in 2 years or less (higher the gas price, quicker the payback). When you notethe immediate performance difference, you may consider GDE's product debt free and clear as soon as you roll it out of the garage.

Boiler

boilermaker2 · **Posted:** Fri May 13, 2011 9:09 am

I did my correspondance with the GDE team via e-mail. I think I was involved in a group purchase but I forget, I've been enjoying it for almost a year now.

Make sure you get the unlimited torque version of EcoTune. If you have not beefed up your TC, you will likely need to one day.

I've consistantly gotten a 2mpg increase and even more in some circumstances. For me, 22k miles per year, the software change will pay for it itself in 2 years or less (higher the gas price, quicker the payback). When you notethe immediate performance difference, you may consider GDE's product debt free and clear as soon as you roll it out of the garage.

Boiler

Rough Idle at cold start-up after GDE ECO tune...

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