EGR Delete Q's

[MJ365]

For those with egr deletes on their trucks, did anyone have the problem with the boost dropping off when the egr is disabled? I originally had the egr blocked when I got the truck but had to re-enable it when the flash came out that checked for egr operation so I didn't have the boost and power loss issue. Now that I rolled my truck back to the original strat I figured I could go back to the way I had it and block it off. Problem is, even with it rolled back it still throws the egr codes and loses power when it is blocked and the valve is dummied up bolted one of the intake elbow bolts. Maybe there is a trick to it I did before that I can't remember. Any help will be appreciated.

[Jeremy]

We have emmisions testing here so I have the EGR blocked, not deleted. I can't say that I noticed a drop in Boost pressure after the mod.

[MJ365]

I guess mine is really "blocked" as well. Made a plug for the egr hole and the valve is still hooked up just outside the intake doing nothing. If I can get it figured out I will pull the egr cooler and weld a disc in the inlet then the valve can be where its supposed to be and still doing nothing. With the egr operational boost is 26 pounds WOT empty. With it blocked boost flatlines at 20 pounds and will not go higher. It is a very noticable loss in power on top.

[StripperDJ]

sounds like you may have a leak somewhere.I would start there first.

[MJ365]

No signs of leakage anywhere. Blocked off egr results in DTC's p0401 and p0404 while only disconnecting the egr connector I get p0401 and p0405. Boost limits to 20psi either way.

[StripperDJ]

well after some homework that i had to do with this problem, and let me say i have seen alot of this same problem...even with tuning with some of the lateter strats the egr valve MUST BE PLUGED UP EVEN IF THE VALVE IS A DUMMY !!!!!!!... if the valve is not plugged up the vvt will not work properly and will not let the turbo spool right..do you have the egr valve plugged up ???

[MJ365]

I have a plug in the egr hole machined to match the egr valve dimensions with the o-rings in place to block the flow into the intake. The egr valve itself is plugged in to the harness but I have it bolted to the intake elbow where it can do it's thing without polluting my engine. I have one more thing to try I'll report back when I test it out.

[MJ365]

Tried a different egr valve hooked to the harness with my blocker in place to see if the position sensor was bad and it does the same thing. Only after a few miles of driving code P0401 pops up and the commanded egr duty cycle goes to 0% and under WOT boost is limited to 20psi.
I know my truck originally didn't have this problem. I ran with it blocked for a long time without issue until I got reflashed when at the dealer for the trans update and apparently that flash was the one where the ecm started going into the supposed "EPA" mode when P0401 is set. I figured rolling back the strategy should've eliminated this issue but it hasn't. Bill set it back to a VXBC4 from the VXBC9 that I had which we figured should've been the original but maybe it should be earlier still.

[MJ365]

I haven't been able to get around this in any way. If I was to buy a Gryphon CS could a custom tune be made to eliminate the egr strategy altogether? Seems like I found a good excuse to buy one.

[cleatus12r]

One way or another, I will get an answer for you.

[sonic blue l]

remove your dummy plug and see if your o rings are burnt off of it.

Btw your calibration should not matter, i have 2 04 6l, one a 03 engine, one a 04. both have up pipe welded shut, egr valves in place. 03 will learn vgt profile with nor problem, and the 04 build boost as normal. Both have the latest calibrations.

[MJ365]

I just put new o-rings on it the last time I changed it out because I thought the same thing and it didn't help anything.

[907DAVE]

Have you taken a look at the MAF sensor?

I was playing with a 6.0 a while back and it was doing some really strange VGT/ EGR stuff, so just for giggles popped out the MAF and cleaned all the crap from the K&N off of it and the truck ran perfect afterwords.


Just an idea.:)

[MJ365]

I just cleaned my MAF for peace of mind. I run a stock filter and the MAF looked nice and clean to begin with. Datalogging with my old defunct predator I can watch when the egr flow test fails and sets p0401.

[MJ365]

Figured out that my problem is there isn't an problem. Had to pull my car trailer with my fast truck on it and on a big hill I booted it and it makes 29psi no problem with a good load on it. Also got .5 mpg better with it blocked off towing and no lag at all taking off from stops. I now know that I can properly delete it without issue. Thanks for the help.

[SICKS-O]

less boost with an egr cooler delete, block off plate, dummy valve, etc is normal. when the egr system is in place and operating properly manifold gauge pressure will be higher then when there is no egr flow. its a complicated answer but basically the volume and pressure of the exhaust that is recirculated back into the intake manifold addes to the overall boost pressure.

[MJ365]

I never thought of that. Makes perfect sense to me now that you bring it up. Thanks for the info.