back to stock, running better ?more power?

007husky · **Posted:** Mon Dec 08, 2008 11:31 am

My emissions are due in 2 months, so i figured before real cold rolls in, get it back to stock and turn the yellow light off for the emissions man.

I undid the ORM, uncaped the EGR, replaced the butterfly... leaving only the EHM till the day of inspection since it takes 2 min to undo it.

Turns out my EGTs went way up (200 F) on regular running and cool down time. that is no surprise since hot gases come now from the egr into the intake.

Also, my top psi where 25 whiththe mods, this morning started noticing spikes upto 30 and a much more responsive truck.

Only mods right now, is cored cat, no muffler and Inmotion stage 2 tuning.

It is also very clear that the in motion tuning doesn`t close as much the egr as the ORM. I wonder if the inmotion tuning reduces EGR at all... (sure doesn't look like it since intake temps on my scangauge are the same before and after inmotion, but they drop big time when doing ORM).

any ideas why ?

Is almost tempting to leave it as it is (semi-stock) and finish building my SEGR and be done with it.

Joe Romas · **Posted:** Mon Dec 08, 2008 12:44 pm

I think with the CEL on the ecm is in some kind of limp mode.

nursecosmo · **Posted:** Tue Dec 09, 2008 6:27 pm

Joe Romas wrote:

I think with the CEL on the ecm is in some kind of limp mode.

Interesting thought. How could we verify this? It would make perfect sense. If the ECU senses that the EGR is malfunctioning it might reduce the tune for lower NOx emissions.

007husky · **Posted:** Tue Dec 09, 2008 11:19 pm

nursecosmo wrote:

Joe Romas wrote:

I think with the CEL on the ecm is in some kind of limp mode.

Interesting thought. How could we verify this? It would make perfect sense. If the ECU senses that the EGR is malfunctioning it might reduce the tune for lower NOx emissions.

this is absolutely noticeable, BIG TIME.

CRDMiller · **Posted:** Wed Dec 10, 2008 12:25 am

husky,

Boost pressure is just that, pressure. Cubics coming in from egr can raise the manifold pressures, especially if you mean, spikes to 30 psi as you drop below 55 mph and loose fourth and lockup while wot (or close to it from ~24 psi /w stage 2) Also intake temps (well, manifold temps) can lessen the density of air and thus increase boost pressures. The fcv butterfly closing aganst a stuck or partially stuck egr valve can make some nice pressures as well. Are you seeing increased smoke?

There are many reasons why you could be seeing higher levels of boost.
1-2 cfm @ 30 psi or 4000 cfm at 25 :P

And it's hard to believe that if a mil were a mini limp mode, that i'd be able to lay down strips of rubber at (25psi:P) with p0401 codes.

Anyway i'm not a engineer, these are just ideas to consider.

007husky · **Posted:** Wed Dec 10, 2008 1:45 am

CRDMiller wrote:

husky,

Boost pressure is just that, pressure. Cubics coming in from egr can raise the manifold pressures, especially if you mean, spikes to 30 psi as you drop below 55 mph and loose fourth and lockup while wot (or close to it from ~24 psi /w stage 2) Also intake temps (well, manifold temps) can lessen the density of air and thus increase boost pressures. The fcv butterfly closing aganst a stuck or partially stuck egr valve can make some nice pressures as well. Are you seeing increased smoke?

There are many reasons why you could be seeing higher levels of boost.
1-2 cfm @ 30 psi or 4000 cfm at 25

And it's hard to believe that if a mil were a mini limp mode, that i'd be able to lay down strips of rubber at (25psi:P) with p0401 codes.

Anyway i'm not a engineer, these are just ideas to consider.

There is much more smoke, yes.

i just noted the egts and boost increase, but my chief complain is the pants feel. and just noticed the other stuff as just stuff i noticed.

nursecosmo · **Posted:** Wed Dec 10, 2008 2:58 am

describe your smoke husky.

Joe Romas · **Posted:** Wed Dec 10, 2008 9:18 am

nursecosmo wrote:

Joe Romas wrote:

I think with the CEL on the ecm is in some kind of limp mode.

Interesting thought. How could we verify this? It would make perfect sense. If the ECU senses that the EGR is malfunctioning it might reduce the tune for lower NOx emissions.

I have a Robert Bosch Book that's based mostly on VW's TDI electronically controlled engines. It goes into great detail about how when one sensor goes out (as in unplugged) it arrives at a "best guess" fail safe mode by using other sensors so your not stranded beside the road :cry:

I've not found an affordable version of the book that covers the newer common rail engines yet :wink:

007husky · **Posted:** Wed Dec 10, 2008 1:11 pm

nursecosmo wrote:

describe your smoke husky.

is mostly at night, at neat WOT or WOT.
wich is normal...
but i get a bit more dense smoke than normal.

with the orm or even the egr blocked, i got very little smoke or much less than now.

007husky · **Posted:** Wed Dec 10, 2008 1:13 pm

Joe Romas wrote:

nursecosmo wrote:

Joe Romas wrote:

I think with the CEL on the ecm is in some kind of limp mode.

Interesting thought. How could we verify this? It would make perfect sense. If the ECU senses that the EGR is malfunctioning it might reduce the tune for lower NOx emissions.

I have a Robert Bosch Book that's based mostly on VW's TDI electronically controlled engines. It goes into great detail about how when one sensor goes out (as in unplugged) it arrives at a "best guess" fail safe mode by using other sensors so your not stranded beside the road :cry:

I've not found an affordable version of the book that covers the newer common rail engines yet :wink:

That is my best uneducated guess...

Also, is possible, since the temperatures here are winterish 30 ish lately, that the hot egr gases assist on raising the temperature of the intake helping a better combustion ?

nursecosmo · **Posted:** Wed Dec 10, 2008 1:59 pm

007husky wrote:

Also, is possible, since the temperatures here are winterish 30 ish lately, that the hot egr gases assist on raising the temperature of the intake helping a better combustion ?

That is a possible scenario but try something else. Do a couple of WOT runs up to 60-70mph with a hot engine, then go back to the stoplight with cars behind you and check how much smoke you can see in the headlights. All CRDs will make some haze in the headlights when you gun it after an amount of normal driving. This is usually just carbon being blown out of the pipes.

007husky · **Posted:** Wed Dec 10, 2008 3:24 pm

nursecosmo wrote:

007husky wrote:

Also, is possible, since the temperatures here are winterish 30 ish lately, that the hot egr gases assist on raising the temperature of the intake helping a better combustion ?

That is a possible scenario but try something else. Do a couple of WOT runs up to 60-70mph with a hot engine, then go back to the stoplight with cars behind you and check how much smoke you can see in the headlights. All CRDs will make some haze in the headlights when you gun it after an amount of normal driving. This is usually just carbon being blown out of the pipes.

I`m not concerned about the smoke

I just would like to figure out why my jeep came back to life when i brought it to stock...

grywlfbg · **Posted:** Mon Dec 15, 2008 4:31 am

007husky wrote:

It is also very clear that the in motion tuning doesn`t close as much the egr as the ORM. I wonder if the inmotion tuning reduces EGR at all... (sure doesn't look like it since intake temps on my scangauge are the same before and after inmotion, but they drop big time when doing ORM).

any ideas why ?

I haven't been on the board in awhile but if you dig around on here there were some InMotion threads where the InMotion guys posted that they weren't able to get the EGR to close more than 50% w/o throwing a CEL. So they can close it some but not completely. Unless something's changed recently.

grywlfbg · **Posted:** Mon Dec 15, 2008 4:34 am

nursecosmo wrote:

Joe Romas wrote:

I think with the CEL on the ecm is in some kind of limp mode.

Interesting thought. How could we verify this? It would make perfect sense. If the ECU senses that the EGR is malfunctioning it might reduce the tune for lower NOx emissions.

Isn't this the whole point of the ORM? ECU loses airbox sensor and programming results in shutting down the EGR.

back to stock, running better ?more power?

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