Performance tuning that deletes the EGR w/o CEL

gmctd · **Posted:** Sat Mar 29, 2008 11:17 am

IAT will be higher with EGR, lower with EGR disabled - if disabled, also check shutdown: engine should stop smoothly, like a gasser (patooie!) - if engine suddenly has acquired that traditional Diesel Death Shudder, sumpin' ain't right, accordin' to Hoyle - lower IAT's + smooth shutdown = success

Rail Pressure is set via ECM-controlled Fuel Quantity Solenoid valve on the CP3, and the Fuel Pressure Solenoid valve on the Rail - max pressure is 23206psia (1600bar), according to DCJ FSM

BTW: I do hope you're onsite with your radio-linked laptop, logged onto the lostkj's CRD forum, so nothing gets lost in translation - any 'mediator' should be up close and personal with understandment of all involved technologies for best results, if you can ascertain my meaning.....................

fastRob · **Posted:** Sat Mar 29, 2008 1:16 pm

gmctd wrote:

IAT will be higher with EGR, lower with EGR disabled - if disabled, also check shutdown: engine should stop smoothly, like a gasser (patooie!) - if engine suddenly has acquired that traditional Diesel Death Shudder, sumpin' ain't right, accordin' to Hoyle - lower IAT's + smooth shutdown = success
.....................

IAT? I Ate That?
Sorry,could not hep m-sef, what does that mean, IAT?
You guys cruise in the stratosphere and here I am trying to keep up on the ground.
R

05infernoCRDL · **Posted:** Sat Mar 29, 2008 1:37 pm

IAT - Intake Air Temp

MTB_TDI · **Posted:** Sat Mar 29, 2008 9:59 pm

gmctd wrote:

IAT will be higher with EGR, lower with EGR disabled - if disabled, also check shutdown: engine should stop smoothly, like a gasser (patooie!) - if engine suddenly has acquired that traditional Diesel Death Shudder, sumpin' ain't right, accordin' to Hoyle - lower IAT's + smooth shutdown = success

Rail Pressure is set via ECM-controlled Fuel Quantity Solenoid valve on the CP3, and the Fuel Pressure Solenoid valve on the Rail - max pressure is 23206psia (1600bar), according to DCJ FSM

BTW: I do hope you're onsite with your radio-linked laptop, logged onto the lostkj's CRD forum, so nothing gets lost in translation - any 'mediator' should be up close and personal with understandment of all involved technologies for best results, if you can ascertain my meaning.....................

Shutdown is smooth. There is a little different sound to the engine at idle. We are thinking that it is because of the EGR. I am going to have to play with Vag-Com and see if I can log the IAT with the new tunes vs. the stock tune. It is sure nice being able to switch them!! That Q-Loader is awesome and even a cave man could use it!

Thanks for the rail pressure. I was going to call you last night but it was 10:00 PM here and 11:00 at your house when the question came up. Needless to say, I didn't call you.

I think I understand your meaning. I just called you to make sure. I really want to figure out if the EGR is working right now. I'll let you know when I verify it for sure.

MTB_TDI · **Posted:** Sat Mar 29, 2008 10:06 pm

fastRob wrote:

[
Sounds Great!
Your efforts are appreciated.
Does the EGR open at start and shutdown or is it off completely?
There are at least 3 EGR functions that I know of: quicker warm up, NOx reductions and quick shutdown.
We want the good not the ugly, right?

EGR is completely off. (verification pending). Upon shut down, there is no difference.

Threeweight · **Joined:** Mon May 14, 2007 5:57 pm **Posts:** 679

Do you have access to a dynometer? I'd be very interested to see what numbers those two tunes deliver.

MTB_TDI · **Posted:** Sun Mar 30, 2008 11:26 am

Threeweight wrote:

Do you have access to a dynometer? I'd be very interested to see what numbers those two tunes deliver.

Not at the moment. These two tunes are the very first two tunes we have tried. The first goal was to get rid of the EGR. We can rent a dyno sometime in the future.

honey_don't · **Posted:** Sun Mar 30, 2008 11:38 am

A nice thing about the q-loader is that on the dyno one can upload the original file and custom tunes so for a typical three pull dyno session one can get a direct comparison between stock and different tuning files on the same vehicle, day, and dyno.

MTB_TDI · **Posted:** Thu Apr 17, 2008 11:30 pm

Sorry for the delay in responding. I was on vacation and this week has been rough back at work (also I have some health issues that have reared their ugly head again). Anyway,
UPDATE
I have chrispitude's scangauge (Thanks!). I was towing a small pop up trailer on my vacation (went to Moab), and I was able to run the stock tune and one of Kerma's tune. I can't really figure out when the dang EGR is running but once in a blue moon. It seems to really only kick in if the engine is lugging it going up a hill. The IAT will climb up about 60 degrees F in the stock mode. In Kerma's tune it may rise about 30 degrees. It seems to be pretty hard to duplicate though.

Is there any way to disconnect the EGR completely and see if the CEL comes on? By disconecting, I mean, mechanically, like unplugging an electrical or vacuum connection?

Again, sorry for the delay, but sometimes there are other things that are more important!
Matt

CATCRD · **Posted:** Fri Apr 18, 2008 6:29 pm

Yes, you can unplug the connector to the EGR valve, if you can get your fingers down there. EGR should not even be active under heavy load, so don't just go by IAT to judge when it's on. IAT will naturally be higher under higher turbo boost psi.

MTB_TDI · **Posted:** Tue Apr 29, 2008 9:29 pm

CATCRD wrote:

Yes, you can unplug the connector to the EGR valve, if you can get your fingers down there. EGR should not even be active under heavy load, so don't just go by IAT to judge when it's on. IAT will naturally be higher under higher turbo boost psi.

Okay, I had a little time tonight and ran into this problem. It is very tight down there. I can get my fingers on it but I don't know how the connecter disconnects. I could see at least three different types of connecters under the hood. One is on the MAF with a red tab that you pull, the other two types are on the fuel manager head. They all disconnect in a different manner and I can't see the one on the EGR.

Can anyone show me a picture of the connecter or tell me which connector is similar? I would really like to check this out. If we can verify it this way, then anyone can get the Kerma tune and not set off a cel when the EGR is disconnected. Then you could flash the computer back to the stock settings using the q-loader and plug the EGR back in for those unfortunate dealer visits! That would be ideal.

Sorry for not posting too often, I have been very busy at work and in my personal life. Any help would be appreciated. I would love to help out on this problem and move on to another issue.

gmctd · **Posted:** Tue Apr 29, 2008 11:08 pm

As explained in the ORM and SEGR threads, ECM will DTC for open circuit if the EGR solenoid is disconnected - ECM also checks EGR circuit for specific current-drain during operation, which resulted in the large 25w resistor in the SEGR box - it's an intelligent system - it must be defeated intelligently

honey_don't · **Posted:** Wed Apr 30, 2008 9:02 am

MTB_TDI-

If you haven't yet you might check the service manual for the relevant info on the connectors>
http://colorado4wheel.com/allmanuals/Je ... _FSM/2006/

MTB_TDI · **Posted:** Thu May 01, 2008 9:39 am

Forgive me for my ignorance, but I just started looking in the FSM. Is there a vacuum line to the EGR? I have seen pictures of the disassembled EGR but no place for a vacuum line.

fastRob · **Posted:** Thu May 01, 2008 9:52 am

Why not just disconnect the electrical connector by the air filter.
I think that is called the ORM.

gmctd · **Posted:** Thu May 01, 2008 1:15 pm

Dude, you have to ignore something you know to assume the position of ignorant - you could also ignore things you don't know, but such is not the case here, I suspect - anyway, your EGR (and mine) is actuated by a PWM-driven very large solenoid, directly adjacent the EGR valve, on the REG-cooler - ECM not only drives the solenoid and monitors the current-drain during operation, but checks every so often for circuit continuity when not in operation - disconnecting das connector ist verboten! und vill net you multiple DTC's. ACTUNG!!

MTB_TDI · **Posted:** Fri May 23, 2008 3:19 pm

Just talked to Charlie,
I am not convinced the EGR is disabled on my tune. It is turned down, but probably not off. So, next I am going to unplug the EGR when I change the oil and am underneath the jeep. I am then going to check the DTCs and Charlie will program the ECU to not set off the CEL. That is where we are at.

On the tranny flashing. We need someone to go into the dealer and get their tranny flashed while we have a "little spy" on board. That will help us out in our quest. Any volunteers?

brew1 · **Posted:** Fri Aug 22, 2008 7:17 pm

MTB_TDI wrote:

Just talked to Charlie,
I am not convinced the EGR is disabled on my tune. It is turned down, but probably not off. So, next I am going to unplug the EGR when I change the oil and am underneath the jeep. I am then going to check the DTCs and Charlie will program the ECU to not set off the CEL. That is where we are at.

On the tranny flashing. We need someone to go into the dealer and get their tranny flashed while we have a "little spy" on board. That will help us out in our quest. Any volunteers?

I assume Kerma is using a European supplier for his tunes similar to InMotion and Rocket Chip, which normally turn down the EGR but not off.
I'm curious to find out how your TC is holding up and how many pounds of boost pressure each of those 2 programs is running compared to OEM.

After I had our CRD ECU upgraded to a Rocket Chip tune it was about 2 months later that we had to have the TC replaced due to the dreaded tranny shudder.

If you go with more aggressive boost pressures are you planning to install a boost valve to control boost spikes? I haven't done this yet because Jeff didn't want to go wild with the boost pressures since he was aware of the TC issue with our CRD's and the tune he put in was considered a mild one.

MTB_TDI · **Posted:** Sun Aug 24, 2008 11:29 pm

Mine is mellow and I don't have a boost gauge yet. No shutter yet, but I don't drive it too hard. Charlie is really busy, and yes, he gets the original tune from someone in Europe and then fine tunes the tuning to what the customer needs/wants and what other mods the customer has.

hatchetman · **Posted:** Tue Aug 26, 2008 10:58 am

Could one just pull the electrical connection to the EGR? Will this present any problem other than a CEL? If one where to pull the plug on the EGR, is the best time to do it is when the engine is cold?

Performance tuning that deletes the EGR w/o CEL

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