Is there any advantage to doing this to the LB7 like there might be doing it to the LLY engine. Have not seen any topic on the forum in regards to this.http://dieselplace.com/forum/smileys/Question.gif Edited by: bushboar

Most LB7's do not have EGRs. Only California and a few other states.

My post from the LLY EGR thread...


"For those of you that are following this and have an '04 LB7 Cal EGR...


Mine has a vacuum pump. The pin is opened using the vacuum supplied from the pump. I pulled the vacuum line from the diaphram on the EGR and plugged it. Second start-up got the light P0401."


http://dieselplace.com/forum/forum_posts.asp?TID=13040&PN=1&TPN=1Edited by: WanaDmxsub

I was going to post about this today as well. I have an LB7 with the dreadedEGR.

How does the computer decide if the light should be set? would a block off plate somewhere work?

Marc

It references the MAP sensor. So no, a plate will not fix it. You will still get a check engine light.

what are you gyes talking about

Hmm-m, http://www.dieselplace.com/forum/smileys/Ermm.gif seems as we Californians are always far in the left fieldhttp://www.dieselplace.com/forum/smileys/Broken Heart.gif

what are you gyes talking about








They are talking about Exhaust Gas Recirculation which 2002-2004 California Emissions Duramaxes (LB7s) had, and all other LB7s didn't. Apparently the ECM (that's Engine Control Module) monitors the flow past the Mass Airflow Sensor looking for a decrease when it (the ECM) calls for EGR, and sets a code which illuminates the Check Engine light if it doesn't get what it askes for.

I wondered when this topic would come up in the forums here. There is a guy selling kits for blocking off the EGR on the 80's diesel Mercedes on the Merc. forum I read. Granted my truck burns cleaner than my Mercedes, but when I pulled the intake there must have been at least a 1/2 inch of oily soot built up on the inside walls. Needless to say, I have one of the blocking kits waiting to be installed.

Did the same as Wanadmxsub (pulled the vacuum hose--see pic) and got a check engine light (I assume the actual codes appear on the DIC?). I couldn't tell if disconnecting the vacuum hose made any difference though.


Wanadmxsub: what did you plug the diaphram with?


thanks!


http://www.dieselplace.com/forum/uploads/5F7_DSC01698.jpgEdited by: donmiller714

Mine is different than yours. Mine has a nipple that the vacuum line (Rubber hose) slipped over. I just taped over the nipple and put a screw in the line to insure that it didn’t suck in any dirt. Since I set a code and the light I plugged mine back in until a different solution comes up.

Is that A pic of the EGR or the Vacuum pump?

Is that A pic of the EGR or the Vacuum pump?





it's a pic of the vacuum pump. the hose on mine has a ridge that holds it in place in the hole. I'm thinking a piece of duct tape on both the vacuum and the hose will do the trick.


btw: what about using that plate the lly guys are using? I haven't checked yet to see if we can but...Edited by: donmiller714

I'm betin' that you set a lot of codes since you unpluged yours at the pump. I pulled mine at the EGR and only set 1 code.


I'm not sure if plugging the EGR with the plate will solve our problem. Other than keeping the exhaust out of the EGR cooler it still does the same thing that pulling the vacuum line does, (Blocks the flow). But at $7.50 I've almost talked myself into trying.Edited by: WanaDmxsub

I have installed a block-off plate like the lly guys are using, and it does set a code. I tried it for a different reason, though. My truck was showing ever-increasing egt's all the time, like 700-800 degF at a steady 70 mph cruise. Any little grade would push it over 1000-1100, and getting into the throttle would see 1200+. I have stock exhaust, no mods other than 90hp Juice. 40k mi, 35k of with juice. I pulled off the juice, and saw no real change. Thought it might be a plugged catalytic convertor, but that's a little harder to check. I plugged the egr just to see if it made any difference, and my egt's are back down to 400-500 deg at cruise! I don't claim to know what is going on, but it's obvious something is wrong with the egr for it to be affecting temps that drastically. I am going to leave the plate in and live with the light on the dash till I can look at the cat later tis week.
As far as I can tell, plugging the egr did not change how the truck runs, but it has solved my high egt issue for the moment.

I'm beatin' that you set a lot of codes since you unpluged yours at the pump. I pulled mine at the EGR and only set 1 code.





I spent a few hours yesterday trying to locate the egr and just couldn't figure out from the pictures in the heims manual what was what. I climbed under and found a hose that looks like it comes out of the bottom of the vacuum pump and into the case, other than that I could only ID the hose I pulled.


Can you give me an idea where the egr is so I can reconnect my vacuum and pull the egr hose?


thanks!


btw: the drive to work this morning did seem a bit peppier--noticed mostly that as I stepped on it she moved through the 1000's faster and up into the 2000's (usually, she'd linger a little longer in the 1000's) so I guess that's an improvement!


Edited by: donmiller714

Look for the Exhaust Gas Cooler in the engine "V" on the passenger side between the valve cover and the turbo charger to the rear of the engine. One end of the exhaust gas cooler attached to a small exhaust gas manifold against the firewall, the other end attaches to a solenoid valve assembly (towards the from of the motor). This solenoid/valve assemby is the EGR valve. This valve controls the introduction of exhaust gas into the intake manifold. There is no EGR hose.

Look for the Exhaust Gas Cooler in the engine "V" on the passenger side between the valve cover and the turbo charger to the rear of the engine. One end of the exhaust gas cooler attached to a small exhaust gas manifold against the firewall, the other end attaches to a solenoid valve assembly (towards the from of the motor). This solenoid/valve assemby is the EGR valve. This valve controls the introduction of exhaust gas into the intake manifold. There is no EGR hose.


Though I can't look right now, one wonders how/what wanadmxsub pulled to disconnect at the egr (noticed that he's in an '04 though).

He probably pulled one of the small vaccum lines that goes to the EGR solenoid. This solenoid (if thats the proper word for it) opens the egr valve that is at one end of the exhaust gas cooler.

I'll get some pic's up (maybe today). As far as I can tell the '02's, '03's and LB7 '04's are identical.


Go to the last post on this thread. http://dieselplace.com/forum/forum_posts.asp?TID=11560&PN=1


Look at the first pic. Upper right hand corner next to the tranni dipstick is the back end of the EGR cooler. That's the end that they are installing the plate on. If you follow it towards the front of the truck you will find the vacuum line.

Do all of the LB7 SMOGS have EGR coolers? From the picture, the blocker plate should work.

Fingers,
Yes, if it has any smog at all, it has the egr and cat. And I think your block-off plate will work, it just sets a code and turns on the MIL light.
Steve

I'm looking into how much the EGR flow can be restricted and not set the codes and light. This would be important for the CA people. I am hoping to nail it down to some small hole in the plate, but only testing will tell. I know the ECM is looking for a difference in the MAF, I just don't know how much.

The other angle I am looking at is using the EGR position sensor's feedback to "modify" the MAF sensor reading. The only drawback here is the ECM will also cut back the fuel delivery based on the apparently reduced air flow.

So many idea's, so little time...

I'll get some pic's up (maybe today). As far as I can tell the '02's, '03's and LB7 '04's are identical.


Go to the last post on this thread. http://dieselplace.com/forum/forum_posts.asp?TID=11560&PN=1


Look at the first pic. Upper right hand corner next to the tranni dipstick is the back end of the EGR cooler. That's the end that they are installing the plate on. If you follow it towards the front of the truck you will find the vacuum line.





I'll check it out at lunchhttp://www.dieselplace.com/forum/smileys/HiHi.gif

I've got pics and I'll post em in a little while.

found the egr diaphram--once the engine cools from the drive home I'll pull the vacuum line from that and replace the line on the vacuum pump.


Thanks all!


PS: code-shmode! Throw as many codes as you like!http://www.dieselplace.com/forum/smileys/Rock On.gif


http://www.dieselplace.com/forum/uploads/41A_egr1.jpg


Edit: Just got back from a trial run--man I love this truck! It seems to be a lot quicker now that the "modification" has been made. Did a couple of WOT tests and it topped out at 95 (thank god for the gov!) and suprisingly (sp) the check engine light when out! I did 2 engine restarts and the light didn't come back on (makes me wonder if I did it right!). I'm sure there are codes, but I don't have the equipment to read them. Oh well! we'll run this awhile and see what happens.


PS: gotta love those antilock brakes as well--full of myself and my "new" truck, I was doing about 35-40 once I pulled onto one of the streets in my neighborhood when I sh!t you not a little girl with her little doggie in her arms strolls out into the street right in front of me (perhaps if I were driving PSD she'd have heard me coming!). I slammed on the brakes, the abs kicked in and stopped the vehicle smartly; I got yelled at by her dad to slow down (and he's right!) and I can now go back to my mild-manored self!http://www.dieselplace.com/forum/smileys/Evil Smile.gifEdited by: donmiller714

Thats it.

If you all are worried about the intake clogging up, why not deal with this with a CCV filter of some sort?

Smog sucks, and screwing with the EGR is not helping the problem.

Not to mention the fine if you are caught with it somehow...

Hell, find a ULSD station near you, leave the thing plugged in.

Come 2006, this shouldnt be an issue as diesel fuel should be closer to soot free.........

Bouncing this thread back to the top. Reading through all these, it seems that the only way we will be able to defeat the EGR without setting a code is to trick it.

That is, rather than cutting off the flow of air through the EGR valve, why not let it pull the air, but make it pull it from somewhere other than the exhaust? Would it be possible to reroute wherever it is that the vacuum pump pulls the exhaust from, so that it pulls it from somewhere else, i.e. in the airbox - after the air filter, but before the sensor (MAF?) that the computer references to decide if it is getting the flow from EGR?

I haven't really looked hard at the system, so I'm not even sure it would work, but it seems like the simplest solution...

Thoughts?

Marc

Has everyone lost interest in this?

The circuit that I made for the LLY's should work for the LB7's w/CA emissions. I don't know what the range is on the EGR vacume sensor, so I can't tell you if some of the values for the circuit will have to be changed or not. Can someone get the output for me?

Fingers, what are the exacts you need?

I need to know what the EGR vacume sensor range is, what it reads when the truck is idleing and finally when the EGR flow test is in progress.

nice work guys...if theres anyway to run cleaner and longer with better mpgs, i'm for it....the politicians and oil co's dont give a crap about us...theyre just lining their pockets with our cash....will be under the hood lookin' for ways too..later bc


what really irks me is i buy this crapped up engine in nh here where emissions arent even required...blah blah blah ! http://dieselplace.com/forum/smileys/Angry.gifEdited by: bob camire

Fingers,
Did you ever get to test the stick on a CA LB7? Let me know!!!

Most LB7's do not have EGRs. Only California and a few other states.

Hehehehe...... that's why I took the choo choo train to Texas
to buy my truck. NO CAT no EGR :ro) ):h

56 ~ you just lucky your DMV clerk was incompetant. Others haven't been so fortuanate.

Fingers,
Did you ever get to test the stick on a CA LB7? Let me know!!!

I don't have access to a California LB7 w/EGR, soi I am just guessing. I know someone had been working on building a circuit. Terrain Twister?

Sorry guys, I've had a lot happen the last few months and I just haven't gotten around to doing it. I'm honestlly surprised I still have a full head of hair with color. Without setting myself up again (I've already made promises I've broken), the best I'll say is that as soon as I can, I'll get this done and post some feedback. Again, I appologize.

TT