I recently removed my EGR, i knew i would get an ses but i had it scanned any way the codes were

P0405/ Egr flow Sensor A Circuit Low Input

P0171/ SYSTEM TOO LEAN (BANK 1)

P0174/ SYSTEM TOO LEAN (BANK 2)

I'm going to install race headers on Thursday and the reason i deleted the EGR so early was because the was a air leak where the EGR meets the intake manifold, so I used a freeze plug for the intake, took the EGR apart and made a gasket so there wasnt an exhaust leak. I was just going to have the codes tuned out but I was worried that because it was too lean should I get a dyno tune? but i really dont have the $500 for that.

 

Are you getting a professional to tune out the codes?

 

yeah, he is got a great rep

 

is the too lean a prob tho? when I installl the header with the ORY will that make it better or worse?

 

if someone is going to tune your car anyways.. he will adjust the fuel trims so it wont be lean...

but for the time being.. dont be getting on it and doing wide open runs until its tuned properly..

 

Yes, thats why I asked if a pro was doing it.

He most likely will not hook up a wideband sensor so you wont know the EXACT A/F ratio, but with this adjusting it should be pretty close.

 

dam i made a few woot runs and a nice burnout tonight, guese i gotta take it easy for a month or 2

 

yeah you dont want to detonate and blow up some pistons...

 

Just curious -- why would removing the EGR make you run lean? The EGR recycles non-combustible gases into the intake. Removing it wouldn't remove fuel so I don't see how this would cause the car to run lean or am I missing something?

 

i was wondering the same, myb the lean codes are from the leak i had???

 

I had an air leak on my EGR port on my old LS1 intake (lost the o-ring when installing headers and didn't notice!) and my fuel trims maxed out at +25. I then got a SES light and had the lean condition codes as well. Due to all the unmetered air leaking in after the MAF the PCM tried to compensate by going max fuel add but the O2s were still reading too low so it set the SES light.

When I found and fixed the air leak I reset the PCM and this brought the fuel trims back inline and the trouble codes disappeared.

 

mine does the same **** it backfired and **** its horrible, im gunna get it yno tuned cuz im gettin a cam, im not even driving my car

 

im going to rescan it tonight to see if its still lean, thanks for all the help guys