i have a question for you guys like always haha. its sayin that the free flowin exhaust may throw codes 401 & 404. but i climbed under the truck and saw no o2s or any other sort of wiring in the exhaust, am i missin somethin?

 

i think you will be alright

 

some lbz trucks will throw a code when you straight pipe it, but a finger stick should take care of it.

 

Yeah listen to this guy, he knows what he is talking about....

 

My truck did not throw the p0401 untill I blocked the EGR.. but yes, its easily fixed with a finger stick..

Also, EFI LIve and PPE programmers will both block the code.

 

Nope, no O2's, it's simple backpressure. When the EGR opens X airflow flows to the intake, this changes the mass airflow readings. When you open up the exhaust (cat delete, less restrictive muffler) then the EGR opens, X airflow just changed and is not corrisponding with what the ECM should be reading. The result is a code for EGR and/or MAF incorrect readings. Now, depending on what programming you have and emissions requirements your truck came with will deternime if a Check Engine Light will actually come on or not. Some throw a soft code where you know nothing about it and the truck acts normal. Some throw a hard code and the CEL comes on, truck changes peramiters and throws itself into a 'limp' mode of sorts to protect itself and the environment.

 

yea i got the PPE excelorator, i figured i could use it to delete it, but would the code come on everytime i turn the truck on? or will it only come up once, and once i delete it will i see the code again?

thanks, JIM

 

As long as you are running a tune from the PPE, it will not come up once you clear it.

 

cooool thanks fellas. cant wait to put everything on this weekend!

New York with all your damn emissions! makin it a pain in my *** to go downpipe haha