Unlplug MAF, A little confused. And map question

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

I tried searching ORM but it show any results. ORM is unplugging the MAF correct? This is used to disable the EGR valve? Does it completely disable it or does it only kinda disable it?

I have only had my libby since friday night and only have 175miles on it. The replaced the EGR and fuel filter before they listed it for sale at the dealer, So i'd like to unhook it while its working correctly. Just making sure i understand how it works. I unplug the MAF, and that will disable the EGR, and throw a check engine light. This will not hurt MPG in anyway correct? And the Check engine light will go away with a GDE tune?

Also i want to clean the MAP sensor, but i'm scared of getting a cleaner that is too harsh. Can you give me a name brand of what to use, or should i use diesel fuel?

liberty2.8 · **Posted:** Wed Jun 16, 2010 7:59 am

Quote:

Also i want to clean the MAP sensor, but i'm scared of getting a cleaner that is too harsh. Can you give me a name brand of what to use, or should i use diesel fuel?

I won't speak to the ORM because I'm not sure exactly how it disables the EGR. The MAP should be left alone in my opinion unless you want to risk failure of a $96 sensor. I cleaned my badly gunked up sensor with a recommended cleaner soon after I got my Libby and had no problem. I think the second cleaning did it in :grim:

Maybe blasting it with some moderate air pressure to remove bulk of gunk but I do mean moderate. I believe the thermistor is very delicate and is easily damaged.

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

I have been leaning that way but if the previous owner had EGR problems with it I'm affraid its really messed up. So i might just pull it and try to clean away the bulk by hand with no chemicals. I want to do the CCV mod to it also probably today.

This is all after replacing rear shocks on the xj

gotta wait to play lol

BVCRD · **Posted:** Wed Jun 16, 2010 8:26 am

The MAP needs to be plugged in. The MAF needs to be plugged in. The EHM just plumbs the blowby gasses overboard. You really don't need to do a darn thing.

flash7210 · **Posted:** Wed Jun 16, 2010 8:51 am

The ORM mod requires you to only un plug the MAF. This will mostly disable the EGR.
The only purpose for the MAF is to tell the ECU when to open the EGR valve.

You should atleast pull the MAP sensor out and check it. If its covered in black gook you
should clean it or replace it. I clean my MAP with cheap carb cleaner from the auto parts
store. However, some people prefer to use Brake-Clean because it leaves no oily residue.
Just be sure to let all the cleaner evaporate and completly dry before re-installing.

Dave

mikey1273 · **Posted:** Wed Jun 16, 2010 9:01 am

I have seen some say they use only non-chlorinated brake cleaner to clean the MAP sensor others said Carb cleaner was ok if left to dry completely. I did mine last fall when I installed the Provent CCV filter. I used B12 Chemtool spray cleaner that is used for carbs and throttle body cleaning. I had it on hand and used it on the old subaru and my lawn mower carb so I tryed it to clean my MAP, it worked well and so far no bad effects here.

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

Well got the xj shocks done. Showered, now for the light stuff on the CRD. Going to measure for the EHM, and unplug the MAF and pull the MAP to see how bad it is. Do parts stores carry a MAP or is it a jeep only part?

Not related to the topic, but since its my post anyway heres a video from sunday's pull.

http://www.youtube.com/watch?v=hBtVv-NO-7k

See if anyone can tell me what happened at the end, and by viewing the 2nd pull below.

http://www.youtube.com/watch?v=mwtQmzF43tE

dieselsmoke · **Posted:** Wed Jun 16, 2010 2:56 pm

BVCRD wrote:

The MAP needs to be plugged in. The MAF needs to be plugged in. The EHM just plumbs the blowby gasses overboard. You really don't need to do a darn thing.

i wouldnt mess w/ the map(you can clean it but use caution) or maf like this guy says. i would however get a tune so you wont have to plug and unplug crap.

But like we have all said, BUT BVCRD. Do the EHM and save yourself some time money. He says it is fine and wont do anything. When i first got my CRD it had oil in the intercooler plumbing/intake ext....and the MAP was covered just like all the others. I did the EHM and cleaned everything, plumbing and map. just checked it all this weekend and not one sign of oil/carbon anywhere. BVCRD might say no, but im tell'n you as proof it needs to be done.

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

I pulled the map after having a retard moment of not realizing it was a allen bolt. lol

Cleaned it with a VERY light pressure squeze of brake cleaner, just enough to have the liquid come out and let the cleaner do the work not the pressure from the can. It was in deffinite need of cleaning it was all sooted up. I'll be doing the EHM as soon as i get some hose to vent it with (later this eve)

What did you use to plug the vent hose that goes into the intake?

I havn't unplugged the MAF yet as i was making sure i didnt throw any codes after cleaning the MAP. I'll be unplugging it later today, until i can get the tune from GDE. Now with that tune is it still required to have the MAF unplugged or do they turn the EGR off with tuning?

BVCRD · **Posted:** Wed Jun 16, 2010 3:19 pm

dieselsmoke wrote:

BVCRD wrote:

The MAP needs to be plugged in. The MAF needs to be plugged in. The EHM just plumbs the blowby gasses overboard. You really don't need to do a darn thing.

i wouldnt mess w/ the map(you can clean it but use caution) or maf like this guy says. i would however get a tune so you wont have to plug and unplug crap.

But like we have all said, BUT BVCRD. Do the EHM and save yourself some time money. He says it is fine and wont do anything. When i first got my CRD it had oil in the intercooler plumbing/intake ext....and the MAP was covered just like all the others. I did the EHM and cleaned everything, plumbing and map. just checked it all this weekend and not one sign of oil/carbon anywhere. BVCRD might say no, but im tell'n you as proof it needs to be done.

You will find that I am not alone on this one. I pulled my MAP back when it had 20,000 miles on it. It was dirty for sure. But since they came out with ULSD, it hasn't needed to be cleaned. Now I have over 70,000 miles on it. I still check it from time to time, but it is bone dry and clean. Don't shoot the messenger.

stoutdog · **Posted:** Wed Jun 16, 2010 3:24 pm

BVCRD wrote:

You will find that I am not alone on this one. I pulled my MAP back when it had 20,000 miles on it. It was dirty for sure. But since they came out with ULSD, it hasn't needed to be cleaned. Now I have over 70,000 miles on it. I still check it from time to time, but it is bone dry and clean. Don't shoot the messenger.

I can't believe I'm saying this, but I'm with BVCRD on this one. :SOMBRERO:

I don't know about the effect of ULSD, but I do know that all you need to do to prevent caking in the intercooler and on the MAP is to disable the EGR. I've been running that way for about 8k miles now, and the MAP only has a slight oily film on it. Nothing to worry about, no drippage/smell, and no worries about emissions.

If I were to do one thing to my Jeep, it would be the GDE tune. Best bang for your buck.

linewarbr · **Posted:** Wed Jun 16, 2010 3:34 pm

mustang_gt_350 wrote:

I pulled the map after having a retard moment of not realizing it was a allen bolt. lol

Cleaned it with a VERY light pressure squeze of brake cleaner, just enough to have the liquid come out and let the cleaner do the work not the pressure from the can. It was in deffinite need of cleaning it was all sooted up. I'll be doing the EHM as soon as i get some hose to vent it with (later this eve)

What did you use to plug the vent hose that goes into the intake?

I havn't unplugged the MAF yet as i was making sure i didnt throw any codes after cleaning the MAP. I'll be unplugging it later today, until i can get the tune from GDE. Now with that tune is it still required to have the MAF unplugged or do they turn the EGR off with tuning?

Congrats on the purchase, mustang. Based on years of experience from the members of this board (some who are now gone) you have taken, or intend to take, the correct first steps in CRD ownership.

Here is the ORM thread: viewtopic.php?f=98&t=22631

The EHM/ Provent thread: viewtopic.php?f=98&t=22703

And the MAP Sensor thread: viewtopic.php?f=98&t=22630

All three of these are on the first page in the CRD TECH section.

The GDE Tune allows you to plug the MAF sensor back in and have the EGR almost completely disabled but with no annoying CEL. I was one of their first customers, and have been running their ECO Tune for well over 30K miles. Combined with my Provent, the last time I pulled my MAP sensor (about 15K miles ago, out of curiosity rather than necessity) it was as clean then as it was when I cleaned it prior to getting the GDE tune.

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

linewarbr wrote:

mustang_gt_350 wrote:

I pulled the map after having a retard moment of not realizing it was a allen bolt. lol

Cleaned it with a VERY light pressure squeze of brake cleaner, just enough to have the liquid come out and let the cleaner do the work not the pressure from the can. It was in deffinite need of cleaning it was all sooted up. I'll be doing the EHM as soon as i get some hose to vent it with (later this eve)

What did you use to plug the vent hose that goes into the intake?

I havn't unplugged the MAF yet as i was making sure i didnt throw any codes after cleaning the MAP. I'll be unplugging it later today, until i can get the tune from GDE. Now with that tune is it still required to have the MAF unplugged or do they turn the EGR off with tuning?

Congrats on the purchase, mustang. Based on years of experience from the members of this board (some who are now gone) you have taken, or intend to take, the correct first steps in CRD ownership.

Here is the ORM thread: viewtopic.php?f=98&t=22631

The EHM/ Provent thread: viewtopic.php?f=98&t=22703

And the MAP Sensor thread: viewtopic.php?f=98&t=22630

All three of these are on the first page in the CRD TECH section.

The GDE Tune allows you to plug the MAF sensor back in and have the EGR almost completely disabled but with no annoying CEL. I was one of their first customers, and have been running their ECO Tune for well over 30K miles. Combined with my Provent, the last time I pulled my MAP sensor (about 15K miles ago, out of curiosity rather than necessity) it was as clean then as it was when I cleaned it prior to getting the GDE tune.

Thanks.

BVCRD · **Posted:** Wed Jun 16, 2010 7:05 pm

stoutdog wrote:

BVCRD wrote:

You will find that I am not alone on this one. I pulled my MAP back when it had 20,000 miles on it. It was dirty for sure. But since they came out with ULSD, it hasn't needed to be cleaned. Now I have over 70,000 miles on it. I still check it from time to time, but it is bone dry and clean. Don't shoot the messenger.

I can't believe I'm saying this, but I'm with BVCRD on this one. :SOMBRERO:

I don't know about the effect of ULSD, but I do know that all you need to do to prevent caking in the intercooler and on the MAP is to disable the EGR. I've been running that way for about 8k miles now, and the MAP only has a slight oily film on it. Nothing to worry about, no drippage/smell, and no worries about emissions.

If I were to do one thing to my Jeep, it would be the GDE tune. Best bang for your buck.

ULSD is the key here.

mustang_gt_350 · **Joined:** Tue Jun 01, 2010 8:47 am **Posts:** 191

Update.

I picked up the hose to do the EHM today, while i was at it i figured i would grab an air filter too since I have no idea how long it was in and when i pulled it to check i could knock a fair amount of dust out of it by tapping it. Put it in as soon as i got into the parking lot and decided i would do the ORM at the same time. Started it up and drove off, first thing i noticed was it felt like it ran way better. Now it could just be the power of suggestion but i don't know. It felt like it wanted to coast better in traffic around 35mph than it did before and it feels like it has a little more light throttle response. Like its hitting the next gear a little faster with the same peddle being used before the mod/filter Unless its just the MAP sensor being clean and it took that long for it to make a difference.

Is it even possible that you can gain some seat of the pants feel from the ORM and what about MPG?

BVCRD · **Posted:** Wed Jun 16, 2010 8:29 pm

You probably got some seat of pants from the filter change. A dirty or wet filter will cause the MAP to dirty and/or pump oil into the intercooler.

stoutdog · **Posted:** Wed Jun 16, 2010 8:55 pm

The filter change probably helped, but the ORM can improve performance and mpg as well.

CATCRD · **Posted:** Wed Jun 16, 2010 11:01 pm

You'll probably also notice that the engine idles and runs a little louder than it used to, because the combustion events aren't being blunted by the recirculated exhaust gases. The noise can affect the "butt dyno". It's only noticeable below about 45mph.

linewarbr · **Posted:** Wed Jun 16, 2010 11:35 pm

Combustion requires oxygen. When you stop exhaust gases (and its diesel byproduct, soot) from being introduced into the combustion event, you get more oxygen, which results in a more complete burn of the fuel. You will notice a little more oomph on the "butt dyno," as well as less black smoke from the tailpipe on slow-speed takeoffs, and better fuel economy.

The only negatives of the ORM are: the annoying CEL; more of a rattle at shutdown, since the Flow Control Valve (FCV) which chokes off airflow at shutdown, is now inoperable; and the engine will produce more NOx because of the higher combustion temperatures. The environmental impact of the higher release of NOx is insubstantial, and more than offset carbon-wise by the fuel economy savings you will have with the ORM.

mikey1273 · **Posted:** Thu Jun 17, 2010 8:37 am

I noticed about a 1-2 MPG improvment when I went to the ORM mod. Less dark smoke at take off and a little more power too. THe downsides being the CEL and harsher shutdown just as the others have said. I think you are off to a good start as a CRD owner. Just remember since you are doing the ORM be sure to plug the MAF back In if you have to take it in for any state inspections or emmissions testing, with a CEL on they may fail your Jeep with out asking anything else. It takes 4 -5 start/stop cycles to clear the CEL.

Unlplug MAF, A little confused. And map question

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