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05DMAX 01-26-2005, 11:59 PM How many of you got EGR flow codes when after straight piping? Edit: Also, for those of you who left the CAT but removed the muffler, hows the sound? Fingers 01-27-2005, 10:18 AM Fed will set EGR codes without turning on the light. RickDLance 01-27-2005, 10:41 AM I tried removing the muffler and leaving the cat and noticed nothing. I then put the muffler back on and removed the kitty. Just a little bit more sound, but thats about it. Saw no codes either way. Will leave kitty off to lower egt. briano 01-27-2005, 11:39 AM from what I have been reading, most that did a complete exhaust -removing muffler and cat and going with straight pipe and/or muffler got codes, but no SES light. When hooked up to a scanner the codes were there for EGR. the others that left the stock muffler on with no cat, or cat with new muffler seem to not have codes. the EGR needs some type of backpressure it seems or it throws everything off on the LLY's McRat 01-27-2005, 01:36 PM My CA truck throws the light like clockwork when it's straightpiped. With the stock muffler and no cat = no codes. Need to install my Finger Stick. 05DMAX 01-27-2005, 06:12 PM so chances are ill get codes but no check engine light? Is there any harm with having the EGR codes sitting in the ECM? briano 01-27-2005, 06:20 PM when you get enough of them stored it will eventually trip the SES lbz492 01-27-2005, 06:37 PM i have codes but my service engion light didn't go on. i have the egr flow codes i don't know the numbers now Fingers 01-27-2005, 07:23 PM when you get enough of them stored it will eventually trip the SES No. blown65 01-28-2005, 08:15 PM Mine is throwing codes, but no SES light. turbo lcc 01-30-2005, 11:39 AM Mine is throwing codes, but no SES light. Same here.. codes but no light. 05DMAX 01-30-2005, 10:21 PM So is there no problem with running with these codes? I think im going to staight pipe and as long as the truck runs fine and the check engine light isnt on, ill be happy, maybe ill eventually get around to adding the finger stick. Also, what is the dealer gonna do if i straight pipe? they arent going to void any warranty are they? blown65 01-30-2005, 10:23 PM So is there no problem with running with these codes? I think im going to staight pipe and as long as the truck runs fine and the check engine light isnt on, ill be happy, maybe ill eventually get around to adding the finger stick. Also, what is the dealer gonna do if i straight pipe? they arent going to void any warranty are they? I havent noticed any diff myself. I do have the finger mod, just havent got it on yet. turbo lcc 01-30-2005, 11:15 PM 05Max My truck ran fine.. I just didnt like running with the codes and having no idea if they threw the EGR into overtime polution of my motor :D mole177 02-01-2005, 12:22 AM What is the finger stick ? Do you guys have OBD II ?? (sorry im new...) skoryaro2 02-01-2005, 09:52 AM What is the finger stick ? Do you guys have OBD II ?? (sorry im new...) OBDII - yes Look here (http://www.dieselplace.com/forum/showthread.php?t=21428) for finger stick info Fingers 02-01-2005, 02:37 PM Interesting fact: The ECM will not run the EGR flow test if the Intake Air Temp is less than 35*. Thus, it will not set codes in cold weather from an open exhaust or blocker plate. However, codes would be set if you unplug the EGR valve. yitsock 02-01-2005, 05:41 PM I have egr unplugged and just the cat on. Honestly, I don't think the truck is any louder, except when you first start it. There is a small amount of resonance in the cab just before 2,000 rpms. I need to get rid of the cat, I want some more sound out of it. | ||