Sorry, i know supid question right? I am not mechanicaly inclined by any means but i was just running over some older posts and i see a lot of people asking were it is on their trucks... what does the egr valve do and why would one want to unplug it?

EGR = Exhaust Gas Recirculation valve.

It recycles exhaust gases back into the intake.

EGR = Does not apply to the LB7, as we do not have one the last I knew.

Exhaust gas recirculation valve, "IF" your truck is equiped with one, it will be located on the top of the engine on the passenger side, below the intercooler duct. it does what the name implies, it recirculates the exhaust back through the intake for emmisions purposes. You would want to unplug the vacum and put a blocker plate behind it to keep the excess soot out of the intake and oil.

For the 2003, there is no fingerstick to block the codes if you were to unhook it, so you would be seeing a CEL all the time.

My 03 has the EGR, but not all 03's had one, only the california emmissions trucks had them, or the cali equiped since mine lived in Texas all its life until I brought it to Florida

if you ever get EFI live you can disable it (more like bypass it by setting it up to open at a high rpm that the truck will never see) and you wont have a check engine light.

So why would i want to disable it even if i had it... im just curious is there a power gain or something?

It keeps exhaust gas (read: soot) from recirculating back into your engine.

So why would you want to unhook it?

if you ever get EFI live you can disable it (more like bypass it by setting it up to open at a high rpm that the truck will never see) and you wont have a check engine light.

If you run EFI live, does that mean I would not have to block and finger? I just drove my truck home and have less than 50 miles on it. I'm going to order a 4 in cat back for it. I would rather go with a front pipe back but don't want to screw with warranty. I don't have a good read on the dealer yet.

So why would you want to unhook it?

My response was misunderstood. The EGR recirculates exhaust back into your motor (hence the name). Disabling and/or blocking it off keeps that recirculation from occurring.

Exhaust gas recirculation valve, "IF" your truck is equiped with one, it will be located on the top of the engine on the passenger side, below the intercooler duct. it does what the name implies, it recirculates the exhaust back through the intake for emmisions purposes. You would want to unplug the vacum and put a blocker plate behind it to keep the excess soot out of the intake and oil.

For the 2003, there is no fingerstick to block the codes if you were to unhook it, so you would be seeing a CEL all the time.

My 03 has the EGR, but not all 03's had one, only the california emmissions trucks had them, or the cali equiped since mine lived in Texas all its life until I brought it to Florida

Tolli, can you take a picture of yours? I'd like to make sure I don't have one, and from what I see in the area of the motor, I'm not sure what I'm looking at.
Thanks :) .

Tolli, can you take a picture of yours? I'd like to make sure I don't have one, and from what I see in the area of the motor, I'm not sure what I'm looking at.
Thanks :) .

You have an LB7, which does not have an EGR.

haunruh,

I will take a picture of mine and post it.
It has been discussed in depth before on this forum that the LB7 Does not have an EGR valve, Well the people that say it does not have an EGR valve are badly misinformed. The cali equipped trucks with the LB7 do have an EGR valve, and I will post a picture to prove it, along with the area to show you where it is. Give me a day or so to get a digital camera.

Here is a pic of my LB7 with an EGR...

Because it's a CA emission truck?

Here is a pic of my LB7 with an EGR...

Because it's a CA emission truck?

Exactlly... same as mine.

WanaDmxSub,

That is exactly like mine, so there you go haunruh!

Because it's a CA emission truck?

Yes, I also believe that there is a state back east that required them...IIRC...

Exactlly... same as mine.
Finally...we meet again...my long :D lost brother with the LB7 EGR

WanaDmxSub,

That is exactly like mine, so there you go haunruh!
NO...Could it be??? LB7 EGR Triplets???:eek: :D






















Just havin' some fun, don't get mad or take it personal...one day I'll say say something and you can pay me back...;)

hunh, i thought all lb7's didnt have them. ill have to look on mine to see if i got one! what states required you to have them?

WanaDmxsub, thanks a lot. I bought mine used so you never really know what it came with.

haunruh,

I will take a picture of mine and post it.
It has been discussed in depth before on this forum that the LB7 Does not have an EGR valve, Well the people that say it does not have an EGR valve are badly misinformed. The cali equipped trucks with the LB7 do have an EGR valve, and I will post a picture to prove it, along with the area to show you where it is. Give me a day or so to get a digital camera.

I always forget about the "special" trucks in Kalifornia. :)

If you run EFI live, does that mean I would not have to block and finger? I just drove my truck home and have less than 50 miles on it. I'm going to order a 4 in cat back for it. I would rather go with a front pipe back but don't want to screw with warranty. I don't have a good read on the dealer yet.

I recently installed a 4" MBRP front pipe back. I ordered the cat delete pipe and cat back system seperately. The cat came out really easy and will go back in just as easy if I need to bring it to the dealer. The key is to connect the front pipe to the rest of the exhaust with a band clamp (available at NAPA for around $10) That way you can drop the pipe and install the cat in about 30 minutes including roll-out and roll-up.

Good luck.

Mine has been to the dealer a couple of times with out the CAT. If the dealer is that much of a $#@@%^ then I would defiantly find another. I have never had any issues with my down tube back 4" exhaust.

Mine has been to the dealer a couple of times with out the CAT. If the dealer is that much of a $#@@%^ then I would defiantly find another. I have never had any issues with my down tube back 4" exhaust.
Agreed! no problems with the cat removed from my Cali. egr laden truck. I am having trouble with mine lately. I want to remove it cause I guess blocking does not take care of the problem on ours. I think a valve is sticking in mine. if I reset the code itwill not trip it again until I really jump on the throttle, then it codes again.

I was reading from Kennedydiesel that if you have the FE9 code in the glovebox, disconnecting the egr wont even throw a code. So my question is this: If the ECM only reads feedback from the MAF when the EGR valve is open, then shouldn't you be able to just disconnect the EGR and improve performance?
Thanks, I have an 04.5 LLY crew cab, totally stock.

The EGR on the LB7's is vacuum actuated (yes we have a diesel with vacuum) (A pump really). I plugged mine at the valve and set a code the 2nd time I started it. Truck ran OK, with no noticeable difference, except for SES light shining in my eyes... IIRC, from 3 years ago, we decided that only the CA trucks set the code (SES light) and that the others didn't. Kennedy must have found the code for the non-CA EGR system.
Disabling the system should improve performance. Will you feel it set of the pants...I don't think so...but you might.
Current options for the LB7's are installing a blocker plate and getting a custom tune from one of the vendors or getting EFILive and doing your own tune. You could also research the parts and remove the entire EGR, I've heard that has been done also. You would still need to get a custom tune or EFI.
I have contemplated all of the above and decided that since I'm not building a race truck, that needs have every advantage I can squeeze out to beat the guy next to me, I'll just leave mine alone for now...