About two months ago I disconnected the EGR connector. All seemed
fine for about a month or so. Then one day I went outside in the
morning and the truck started but died immediately. After about 3
minutes of cranking, waiting, and hitting the gas I got the thing to
start. Then it started to happen more and more to where it would
not start about every tenth attempt. It would always catch for a
second then die, like it wasn't getting enough gas. If I held the accel
to the floor as it caught I could get it to stay running.



I pulled the Juice out and the same thing happened. Reconnected
the EGR and ran for a week and it still kept happening. Took it to the
dealer and he said there were EGR codes showing. I asked about doing an
EGR disconnect. The service mgr said you can't do that because it will
really mess up the air / fuel mixture especially at idle.



Said he checked some TSBs and found that the EGR calibration
needed to be updated. Said that the opening needed to be adjusted from
1/4 inch down to 1/8 inch diameter. So far after a couple weeks the
truck runs great with no probs starting and the fuel economy is up
about 1 mpg over being disconnected.



Opens up a whole slew of questions now like;



-If the spring shuts the EGR when disconnected, then why would the
truck not start (like it was getting too much air through the EGR)?



-If the EGR only has a 1/8 in opening then is it really going to gunk up the intake?



- Was a reflash of my ECM done at the same time and that was the problem? Dealer said no reflash needed, but who knows.



-Why hasn't anyone else had this happen?



- Why doesn't Donald Trump get a haircut?



Jeff

I have had the EGR unplugged for a few weeks now and went into the dealer to check on the computer updates for the LLY. He plugged in the TechII and my injectors #4 & #8 showed high positive balance rates. We plugged the EGR back up and the injectors went back down to normal rates. Has anyone else had this happen.

I have found that my truck runs much better with the egr plugged in. I ran without the egr for a couple months, and it was good at first, but seemed to get worse as time went on. I went and got all needed updates, and truck runs great.

I would concur to emerick115's comments. Things seemed better at first...

Similar thought here as well...





I ran for about 2 months EGR unplugged, very small increase in performance if any!!!!!! PLUGGED in Mileage on 2-3 , 400 mile trips went back up... ran for about 2 weeks plugged in... RAN BETTER AROUND TOWN...





Been unplugged again for about 1.5 months... MILEAGE IS DOWN AGAIN...


Gunna hook up the JUICE(IF IT EVER GETS HERE!!!), run for a while, if it doesn't show any MILEAGE IMPROVEMENT, I am plugging back in and LEAVING IT IN...





I HAVENT SEEN ANY IMPROVEMENTS in it UNPLUGGED.. I THINK IT IS ALL A MYTH AND DOESN"T DO ANYTHING TO UNPLUG, though i understand what the basis behind others unplugging and making the Block Off plates..





BIGhttp://www.dieselplace.com/forum/smileys/smiley19.gif

Donald Trump won't get a haircut because if he cuts off any of the 20% that is growing he won't have enough to borrow to cover 80% that isn't.http://dieselplace.com/forum/smileys/smiley36.gif


It kills me that the people who work for him have to look at him with a straight face. I'd sure like to see him on a winday day!

Maybe he's like Sampson in the bible and will lose all his power if he cuts his hair.

Were any of you guys running with the block off plate installed? I ran with the EGR plugged in and the block off plate installed and had codes P401 and P404. Didn't notice any change in performance though. Now with Fingers stick and plate installed, I don't get any more codes and haven't noticeable any difference in performance either. Jeff, sounds like you have a friendly service manager. Ask him what would happen if you just installed the block off plate.

Well cr@p. http://www.dieselplace.com/forum/smileys/smiley7.gif Just went out and the truck wouldn't start again. Looks like the EGR calibration might not have been the issue.http://www.dieselplace.com/forum/smileys/smiley18.gif
I've noticed that after the truck does start, about a half second after
it fires up the rpms drop very low and then stabilize up at the right
level. Sometimes when the rpms drop the truck stalls. Then
getting it to restart takes several minutes of cranking. Maybe
I'll swap in a new fuel filter.



Any thoughts from anyone?

Jeff

I just saw this post I had just put this on the other thread my engine was starting to lose mile per and it was not starting up at first crank. I put in one of the blocker plates and at first thought all was really cool. After taking the plate back the truck is again running like it used to mpg is up and starting is first crank.

I am curious. You are running the plate only, correct? I have not heard
anything about problems with the plate and Stick. Anyone? Might be too
early.

plate installed, egr unplugged. no change in power or mpg. 2500 miles on the truck. have had the tick at 75 mph only. today had it at a standing idle, irritating as it is quite loud. edge/attitude installed at 500 miles. i keep it at level 3 fuel boost at 5. i could not tell any improvement with plate or egr unplugged. will be interesting to see how this plays out.


nelson


05chev d/a cc 4x4. edge/attitude.

Has anyone else had problems with performance or decreasing mileage with the EGR unplugged & blocked, but without Finger's stick. I unplugged & blocked mine a 1000 miles ago. Seems to still be running smoothly, but I believe my mileage is down. I hate the thought of running all the soot back into the intake, but if the ECM is compensating for not seeing any flow, and it hurts the performance, then I'll hook mine back up until I can get Fingers to make me a stick. Any hope for that in the next few weeks ?

i had some problems with the mod, not sure if it was caused by a bad egr or the egr went bad from all these mods ( dealer has to replace egr system now ). what i found was the it seemed to make the truck run worse, didnt see any mileage increase, in fact if anything i think it went down and i think the pcm compensated for the lack of egr and change the air mixture anyways. i know whats been said about the egr being on there for emissions, but if the exhaust gas is being re-circulated using the egr, i would think we would get better mileage with having the egr working - and the egr valve that opens is only 1/8" i believe so it cant be doing that much bad - think about all the trucks with egr that have over 100k miles and no problems ??

Here are my experiences:


For reference my truck has Federal Emissions.


I unplugged my EGR way back when MaxPower first started experimenting. I noticed a difference immediately in improved throttle response as the truck felt more like my LB7 off the line. I did not relalize any improvement or decline in mpg.


When the block off plate became avaliable I installed one in hopes of curing the water temp/fan clutch issue. Also I liked the idea of not recirculating all the soot though the intake. I had an exhaust leak (due to my own fault, only using the factory gasket) that did cause my mpg to plumet. I did not notice any increase in performance or decrease in enginge temps with the block of plate over just unplugging the EGR.


I saw this post and decided to take out the block off plate and plug my EGR back in. I can tell without a doubt on my truck there is a difference in performance. With the EGR operational my truck is a dog with or without the Juice. Also I do not notice any gains in MPG with the system enabled.


Once I get my truck reflashed I am going to put the block of plate back in and leave it. My truck does run better sans EGR and I still like the idea of keeping the soot out of the intake.

When the block off plate became avaliable I installed one in hopes of curing the water temp/fan clutch issue.





Good post. Do you feel that it has helped the fan clutch scenario, keeping in mind the lower OAT's of late?


I would love for someone to devise an experiment to show if this has an effect on heat energy displaced to the radiator...

I've not had any problems since I disconnected my EGR plug.


I haven't done the block off plate, or done any testing like others have done.


It just runs great. I'm happy with it, though I don't notice allot of difference in performance. I just like the idea of less soot going into my intake.http://www.dieselplace.com/forum/smileys/smiley32.gif

If these LLY's are performing better initially with the EGR blocked or unplugged, and then the mileage and performance is deteriorating - maybe the ECM is learning and compensating for the low EGR flow signal by retarding the timing or altering the fuel pulse to compensate for the changed oxygen/exhaust mixture. With the EGR enabled, the exhaust introduced into the cylinder cools the combustion and slows it down, and perhaps the LLY's ECM then advances the timing at that point to increase performance and mileage. I think some of the power boxes do the same. So, disable the EGR and maybe the ECM no longer advances the timing or changes the fuel pulse. The LB7's without EGR's would not have this variable built into the ECM, and may account for their better mileage & performance. Any way to check it?Edited by: okauto

When the block off plate became avaliable I installed one in hopes of curing the water temp/fan clutch issue.





Good post. Do you feel that it has helped the fan clutch scenario, keeping in mind the lower OAT's of late?


I would love for someone to devise an experiment to show if this has an effect on heat energy displaced to the radiator...





I saw very little if no change. I have not seen the extreme temps some of the other guys are experiencing in the other thread but my LLY has always run hotter than my LB7. In addition, I have complained about the over active fan clutch since day one.


I was convinced the block off plate was going to fix the overheating (it made sense in theory). Immedeately after installing the plate I made a 250 mile run across I-40 towing about 5000#. The outside air temp was around 98 and the grades were moderate. On every hill the temps began to creep up over the 210 mark with the fan blowing hard. On the down hill side the temps would start back down and the fan would release at around 198. As a result, on my truck I did not see any effect from the block off plate on the overheat issue. I think others in the overheat thread have come to the same conclusion as well but I would also like to see some definative testing.


This summer if I was running hard (80-85mph) my truck will go over the 200 mark UNLOADED, just me in the truck. At 200 my fan clutch usually kicks in and it drives me crazy. I am actually concidering an electric fan to replace the manual. I am going to see what the mfgs have to offer this year at SEMA...................

I never disconnected the EGR, but I did have the block off plate. I just took off the plate and it seems to have more seat of the pants power. MPG wise I never saw great improvement, but I did see improvement when I started using Performance Forumla additive and got a new front pipe without the cat. Now it seems to be more responsive and my MPG is up by 2 MPG.

kbass24emtp,


Do you still have your muffler in place? If so how does it sound with the cat gone?


Tom C.

Yes, the muffler is still there. As for the sound it kind of sounds like a jet engine. You can really hear the turbo spool up.