P0171 System Too Lean – Bank No. 1.

 

yup, but i here like a vacum leak too:shrug:

 

OH OK...I think i know what you mean now. Sorry bro, over the phone there was a lot of static!!

Ok, so that line yoru talking about is under the MAF then, Ok...And when you make a fist over it it quietens down so that tells me you need to put a clap at both ends of that line. When you put your hand around it to make the fist I bet your pushing down n it sealing the leak...lol.


OK, So yoru talking about THIS hose right? Mine has a soft cover on her..but she is a hard line inside. The end has a elbow that in attached by nipple on top if the valve cover. Not the nipple on the before side of the TB but the after TB side. Look at my pic and tell me if thats the right one or not.

 

@banditz thats the right one but mine dont have that rubber on the outside, and i just replace the elbow its new i got it at the dealership...

I can here noise by the elbow and below the map sensor too...

 

Ok sweet, well at least were on teh right page then.

Ok, go out and press down on the intake in that corner...see if the sounds disapates any at all.

Then, put your fingers around the joint there and see if you can pin point the sound at all. IF not, then put your finger around the hose like if you were doin what you did before...then move it up n down the tube to see if you can pick a spot out that may be leaking...if you can not find one at all, then it would be time to pull the intake off to me...gotta find out where the leak is coming from...

 

it sounds more from below the map sensor

 

If thats it then you have no choice bro...Gonna have to pull the cover n everything off. Sorry bro...

 

is it hard to remove it or it gots a cover??

 

Its not a pain....but it takes some time..

 

I found the intake manifold at gmpartsdirect.com for $198+shipping dealer wants $500++++

 

Dude I would check before i bought ANYTHING else..make sure whats broke is what your buying...take her apart, and see what ya find. Best way I know to do it man

 

(N.L.C) do not remove the valve cover or intake manifold just yet!!! It's normal for the hose you described to make a hissing sound and leak a bit. You could try and put clamps on it. The hose is where the fresh air for the crankcase ventilation system enters.

I highly suspect your code is caused by a leak elsewhere. Check all the connections in the rest of the intake system including the hose from the passenger side rear of the valve cover to the bottom of the black resonator box. You could also try cleaning the MAF sensor but only use MAF cleaner on it.

 

We tried that brother. He removed and has replaced damn enar half of the entire system! LOL

Normal for the hose to hiss? You mean its normal for a leak to occur there? If so, then this is the first time for that particular hose. The one that alaways leaks that I have seen is the egr hose. This one would be a first for me. And i can't find a single other thread stating that particular hose was the reason of the leak.

When we talked over the phone I had told him to clamp that hose first things first...there was a decent amount of this done over the phone, and through pm's. So we have tried ALL the normal shit...

Thanks for helping him though. MAYBE we can both help this guy out and figure this out! Poor guy been working on this for weeks now...

 

hi sarge. havent seen you on in awhile.

sorry off topic

 

O2 sensor is new
Temp sensor is new
Maf sensor is new
Map sensor is new
Fuel pressure regulator is new
Fuel filter is new
New Cai

I been working on this for months

 

I got whatchu need brah lol

 

is it a NEW sound?

because Ive had 3 motors and 2 intake manifolds and they all have that sound..

tho ive never gotten a CEL from it

 

Well, when he puts his hand around it and cups it the hissing goes away. So to me, that means it gotta be a leak somewhere. The only hiss i hear from my 3.5 is from teh intake, and just a tad from the brake booster area...But the sound he hears is quite loud. He said I believe it was him, you can hear it very well...I could barely even hear it over the phone...

To be honest, anyone who is near this guy needs to help him. That's the biggie. He need's help that way...over the phone, the internet, and through pm's and I still have failed the guy. It's just a issue that needs to be delth with in person as far as I can tell...That being said, there has got to be a memeber thats within drivin distance...

 

See bro...told ya wt would have the parts! LOL I knew he had those motors layin around and that he would hook ya up on them... Always go to the members before just buyin something new man. Always...lol.


And again, for those who may be wondering...he bought this stuff new before he ever came on here..When that failed, is when he came on here and I started helping him. So no flaming!! LOL I didnt tell him to start replacing stuff! LMFAO!

 

did the code happen before you installed the cai?
Yes...

i put the new cai 2days ago but the lean code po171 been on sense Aug-2010 thats when i started to put all them parts , i reset the computer and its back in 15min, but when it started in Aug i would reset it and it would stay off 4-6 days and now 15min and the engine light is on, i dont know

 

maybe this week am going to start on it will go from there

 

I just wanted to you all know that it was the fuel pump put a new one no more lean bank 1

 

How many miles did you have on it?

 

thats odd i had the same problem as this and i took some silicone and applied it the plastic tube put it in the hole and waited 1 hour for it to cure and problem was solved no more intake manifold leak.

 

my 05 has been doing it since day one too. might be the reason for my 17mpg???

 

iv had this same code ever since i did a intake mod. i no its related

 

I've had that sound since I bought my truck tried the clamps it drove me crazy sound still there

 

Old thread here sorry but it seems like a very common issue.
I have the same noise. I noticed it more when i replaced the house in the back of the resonator box.

So is there a fix for this? I was thinking just get rid of that elbow and run one length of hose with no fittings. Then there is no reason that should leak.

Sent from my SM-G920P using Tapatalk

 

The foam hose cover that is shown in #4 post (by banditz) is there to dampen the sound of air rushing thru the orifice. If you are disturbed by the sound just cover it w/pipe insulation or foam tape. My '04 has the OEM foam & it is silent.