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P0171 & P0174
Rosco the Iroc
post Jan 9 2010, 10:26 AM
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I keep getting codes for lean left and right bank. There are no other issues, runs fine and no other codes set.
Any ideas for troubleshooting?


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Scott
post Jan 9 2010, 12:16 PM
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The first thing I would check is the MAF. Carefully ensure it's clean using MAF cleaner only. If you've recently added an oiled filter, you might have over oiled it and fouled the wire. Then check for an air leaks in the ducting to the TB. That should solve it.


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Rosco the Iroc
post Jan 9 2010, 02:19 PM
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Still running stock filter, but I'll check the intake ducts.
Thanks

Edit:
Their fine.

This post has been edited by Rosco the Iroc: Jan 9 2010, 06:51 PM


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Rosco the Iroc
post Jan 11 2010, 09:15 AM
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I did some searching and came up with a theory-
Intake gaskets.
Truck has 140k. So they have stiffened up a bit.
When I leave the house early I warm up the truck (no codes), but when I go home from the ship I just start and roll out so the eng has no warm up time before I'm getting on it so the things have not heated and expanded so it sucks in some air and I get both bank lean codes. this started only after we have been in the low 30's and 20's here.
Next I'm going to get out the starting fluid and test this out.

This post has been edited by Rosco the Iroc: Jan 11 2010, 09:16 AM


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team D.A.T.A.
post Jan 12 2010, 05:39 PM
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QUOTE (Rosco the Iroc @ Jan 11 2010, 08:15 AM) *
I did some searching and came up with a theory-
Intake gaskets.
Truck has 140k. So they have stiffened up a bit.
When I leave the house early I warm up the truck (no codes), but when I go home from the ship I just start and roll out so the eng has no warm up time before I'm getting on it so the things have not heated and expanded so it sucks in some air and I get both bank lean codes. this started only after we have been in the low 30's and 20's here.
Next I'm going to get out the starting fluid and test this out.



Mine just blew those codes and the intake manifold gaskets needed replaced.
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jrod1475
post Jan 13 2010, 11:53 AM
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I'm getting these same codes and a stumble at cold idle.

How much did the intake gasket work set you back?

Also, I cleared the codes since i need to go pass emissions, but when i went to get it tested, the readiness indicators weren't set yet. Tried again this morning and they still aren't set. How long does it take for these to complete a drive cycle?



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Scott
post Jan 13 2010, 11:57 AM
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Yes, once you verify the MAF is clean and functioning properly, and the ducting has no leaks to the TB, then you're talking about bigger issues for sure, including the intake gasket, perhaps O2 sensors and a host of other possible things.


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jrod1475
post Jan 13 2010, 01:21 PM
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It could possibly be the MAF or a leak, but i cleaned the MAF recently. The O2's are a year old so i don't think it's them.

Do you know how long it takes to complete a drive cycle? I'm really trying to hit that magic time between a completed drive cycle and before the codes come up to go pass emissions. I've failed twice because it wasn't ready.


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2003_Z71
post Jan 13 2010, 03:08 PM
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My truck has been throwing the POS code for a while..... ph34r.gif


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Scott
post Jan 13 2010, 03:59 PM
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I thought it was 50 cycles. Just leave your door open and crank 'em out and see what happens.


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DMarts10
post Jan 13 2010, 04:21 PM
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a small exhaust leak can throw a lean code if the leak is before either of the 02 sensors. Too much oxygen in the exhaust triggers a lean code.


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jrod1475
post Jan 13 2010, 05:38 PM
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QUOTE (DMarts10 @ Jan 13 2010, 04:21 PM) *
a small exhaust leak can throw a lean code if the leak is before either of the 02 sensors. Too much oxygen in the exhaust triggers a lean code.



I don't think it's that far back though, since i'm idling rough when it's cold. I think i'm leaning towards intake leak, vacuum leak or my fuel pump.


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jrod1475
post Feb 9 2010, 02:34 PM
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Well, it was the intake gaskets. Getting new ones today. $350 at the Dealer....



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Gary P
post Feb 10 2010, 05:51 AM
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QUOTE (jrod1475 @ Feb 9 2010, 03:34 PM) *
Well, it was the intake gaskets. Getting new ones today. $350 at the Dealer....

Good. Seems to be a reasonable price. It's about 3 hrs labor, so you're right in the ballpark, especially at dealer rates. thumbsup.png


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2003_Z71
post Feb 10 2010, 12:47 PM
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QUOTE (Gary P @ Feb 10 2010, 06:51 AM) *
QUOTE (jrod1475 @ Feb 9 2010, 03:34 PM) *
Well, it was the intake gaskets. Getting new ones today. $350 at the Dealer....

Good. Seems to be a reasonable price. It's about 3 hrs labor, so you're right in the ballpark, especially at dealer rates. thumbsup.png

So GM still hasn't figured out how to make gaskets. I was "wishful thinking" that it had been resolved after the 5.7 issues. rolleyes.gif


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Gary P
post Feb 10 2010, 06:35 PM
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QUOTE (2003_Z71 @ Feb 10 2010, 01:47 PM) *
QUOTE (Gary P @ Feb 10 2010, 06:51 AM) *
QUOTE (jrod1475 @ Feb 9 2010, 03:34 PM) *
Well, it was the intake gaskets. Getting new ones today. $350 at the Dealer....

Good. Seems to be a reasonable price. It's about 3 hrs labor, so you're right in the ballpark, especially at dealer rates. thumbsup.png

So GM still hasn't figured out how to make gaskets. I was "wishful thinking" that it had been resolved after the 5.7 issues. rolleyes.gif

Well, I think it's finally been resolved with new gasket materials, but for many years lot's of out 5.3 engines have had to have the gaskets replaced.


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jrod1475
post Feb 11 2010, 02:43 PM
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They did say it was an upgraded gasket. I think it's by a different manufacturer from the orginal too.

The good thing is that it wasn't that expensive and now the dealer has been all over my truck and everything else looks good. I didn't even realize how crappy it was running. It's like a new truck now compared to what it had been. But i guess they cleaned about 8 years of gunk out of there too. Only so much that seafoam can do.

BTW - called a reputable local shop and he said it was almost a $700 job. Guess the dealer is good for some things.


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