both banks reading lean

snidehockey

New Member

Jun 18, 2007

131

0

0

Orlando, Fl

Dec 13, 2007

#1

• Dec 13, 2007

• #1

I have BBK LT Headers and BBK o/r H pipe...

for awhile I would get ses light w/ a p0420 (bank 0 catalyst efficiency below threshold) the light would only come on maybe every 500 miles...

well now I got a SES light and the car seemed pretty sluggish...well I took it to Advance Auto and they pulled 2 codes this time...saying lean on both banks. I had them clear the codes and the car ran great again...well about 5 minutes later it threw the code again and is sluggish.

my guess is that those codes throw it into limp mode but I don't know for sure.

Regardless though...would my high flow cats be causing this? They didn't throw these codes for the last 10,000 miles that I've had the car.

 

snidehockey

New Member

Jun 18, 2007

131

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0

Orlando, Fl

Dec 13, 2007

#2

• Dec 13, 2007

• #2

sorry...did a little searching and I have 2 possible causes...

vaccuum leak. I see that one of the hoses on the IAC is kinda cracked where it contacts the IAC inlet

OR

MAF. I took a bunch of sensors out a week ago and cleaned them w/ electrical parts cleaner including the MAF...but I used the stronger kind of spray and I read that sometimes that damages the MAF sensor.

I'm hoping for scenario A

these are the codes BTW

P0171 - System Too Lean - Bank No. 1.
P0174 - System Too Lean - Bank No. 2.

 

blackfang

Founding Member

Dec 17, 2001

1,290

1

39

Richmond, Va

Dec 13, 2007

#3

• Dec 13, 2007

• #3

An o/r H pipe doesn't have hi-flow cats btw. They have no cats.

I would also check that you do not have an exhaust leak. Very good chance the maf is doing it, but don't rule out the others.

 

snidehockey

New Member

Jun 18, 2007

131

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0

Orlando, Fl

Dec 13, 2007

#4

• Dec 13, 2007

• #4

sorry my bad...I meant BBK H w/ hi-flow...i forgot o/r is off road.

I don't think there's an exhaust leak anywhere...I got under the car just recently and made sure all the bolts and flanges were snug, and they didnt budge. I have a feeling it's MAF as well.

 

Killa

Active Member

Jul 9, 2007

1,006

56

49

Dec 13, 2007

#5

• Dec 13, 2007

• #5

snidehockey said:

sorry...did a little searching and I have 2 possible causes...

vaccuum leak. I see that one of the hoses on the IAC is kinda cracked where it contacts the IAC inlet

OR

MAF. I took a bunch of sensors out a week ago and cleaned them w/ electrical parts cleaner including the MAF...but I used the stronger kind of spray and I read that sometimes that damages the MAF sensor.

I'm hoping for scenario A

these are the codes BTW

P0171 - System Too Lean - Bank No. 1.
P0174 - System Too Lean - Bank No. 2.

Click to expand...

I got the same dam fiking code after PI intake swap.

 

snidehockey

New Member

Jun 18, 2007

131

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0

Orlando, Fl

Dec 13, 2007

#6

• Dec 13, 2007

• #6

well a little more info...

I got in my new motorcraft IAC valve today...and installed it adding some copper rtv/gasketmaker to make a good seal...and in the process removed the restrictor plate thing that I made for the IAC. Well it took away a hissing sound (vac leak) that the plate caused...and so far no code...but I haven't driven very far, so we'll see.

 

snidehockey

New Member

Jun 18, 2007

131

0

0

Orlando, Fl

Dec 14, 2007

#7

• Dec 14, 2007

• #7

just drove about 20 miles home on the interstate in 5th gear and no SES...I guess it was vaccuum leak. Time will tell though

 

d98gt

Founding Member

Mar 14, 2002

4,505

59

204

SE Texas

Dec 14, 2007

#8

• Dec 14, 2007

• #8

I hope that easy fix works out for you in the long run, but only time will tell when you drive around a bit.