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Posted: 12/30/2011 1:28:18 PM EDT
2002 Tahoe 5.3l 108k miles. Service engine light comes on when outside temp gets close to 0. Had the oil changed today at the dealer and they pulled the code and said it read bank one lean. They said it was likely an O2 sensor. I had the fuel filter changed. Should I do the sensor myself or drop it off to make sure it isn't a more serious issue?
Link Posted: 12/30/2011 1:32:44 PM EDT
Not a GM mechanics but,...

It probably is the driver side O2 sensor, fairly easy to change. You may have to remove the front of the front driveshaft to gain access.
O2 sensors also come out easier when the exhaust pipe is hot. Rent an O2 sensor socket from a auto parts store.
Link Posted: 12/30/2011 1:42:57 PM EDT
Intake gaskets leaking vacuum.


In the morning, take 1/2 gallon of water. Pop the hood and start the engine. Pour water on edges of intake manifold near the valve covers.


If it starts running rough, the gaskets are leaking. No you would not see coolant or anything leaking because coolant does not flow through intake.

Posted Via AR15.Com Mobile
Link Posted: 12/30/2011 1:46:44 PM EDT
Originally Posted By jeep450:
Intake gaskets leaking vacuum.


In the morning, take 1/2 gallon of water. Pop the hood and start the engine. Pour water on edges of intake manifold near the valve covers.


If it starts running rough, the gaskets are leaking. No you would not see coolant or anything leaking because coolant does not flow through intake.

Posted Via AR15.Com Mobile


I was going to suggest there is an outside chance it's the air intake/plenum gasket. you might be able to spray throttle body cleaner/carb cleaner around the gasket area too, if there's a leak, the idle speed will change. I'd probably guess it's an O2 sensor though, and they are usually fairly easy to replace. If it's a vortech and if it is similar to the vortech 4.3s, take that thing and light it on fire, roll it down a hill and into a large body of water. Chevy and their Vortech 4.3 intake manifold gaskets can go straight to hell.
Link Posted: 12/30/2011 1:50:33 PM EDT

do computers kick out a code for O2 sensors at 100K?

since they deteriorate over time?


Link Posted: 12/30/2011 1:52:10 PM EDT
Originally Posted By kroed11581:
Originally Posted By jeep450:
Intake gaskets leaking vacuum.


In the morning, take 1/2 gallon of water. Pop the hood and start the engine. Pour water on edges of intake manifold near the valve covers.


If it starts running rough, the gaskets are leaking. No you would not see coolant or anything leaking because coolant does not flow through intake.

Posted Via AR15.Com Mobile


I was going to suggest there is an outside chance it's the air intake/plenum gasket. you might be able to spray throttle body cleaner/carb cleaner around the gasket area too, if there's a leak, the idle speed will change. I'd probably guess it's an O2 sensor though, and they are usually fairly easy to replace. If it's a vortech and if it is similar to the vortech 4.3s, take that thing and light it on fire, roll it down a hill and into a large body of water. Chevy and their Vortech 4.3 intake manifold gaskets can go straight to hell.




Water works better than intake or brake cleaner.
Link Posted: 12/30/2011 1:52:59 PM EDT
Get a Computer Code Reader from Autozone or some other Car Parts place and get back with the Codes.













Impeach Obama for the Good of the Children.
Link Posted: 12/30/2011 1:58:03 PM EDT
[Last Edit: 12/30/2011 1:59:34 PM EDT by jeep450]
Originally Posted By gunham:
Get a Computer Code Reader from Autozone or some other Car Parts place and get back with the Codes.



Impeach Obama for the Good of the Children.




He said lean bank 1 which is P0171.
Link Posted: 12/30/2011 2:31:04 PM EDT
Originally Posted By jeep450:
Intake gaskets leaking vacuum.


In the morning, take 1/2 gallon of water. Pop the hood and start the engine. Pour water on edges of intake manifold near the valve covers.


If it starts running rough, the gaskets are leaking. No you would not see coolant or anything leaking because coolant does not flow through intake.

Posted Via AR15.Com Mobile


Very interesting. It sometomes runs rough when I go through a car wash. Especially if I get the under body spray.
Link Posted: 1/5/2012 1:34:53 PM EDT
Update?
Link Posted: 1/5/2012 1:36:25 PM EDT
Coolant temperature sensor
Link Posted: 1/5/2012 1:36:58 PM EDT
My 2000 Tahoe 5.7L had the same issue when it was -5F here and my brother (a Master ASE GM mechanic) cleared the code for me and it hasn't come back. The code said it was an O2 sensor and he said he wouldn't worry about it unless it came back.
Link Posted: 1/5/2012 7:21:38 PM EDT
Originally Posted By jeep450:
Update?


I haven't had a chance to work on it yet. Don't know when I'll get to it now, I'll just drive the Jeep. Thanks for your help.
Link Posted: 1/5/2012 10:16:50 PM EDT
Get some contact cleaner and clean you mass air flow sensor. Then drive it for a bit and if the code clears you are good. If not then something else oxygen sensor or vacuum leak. 70% of the time it is a dirty maf or air filter especially with clowns that had k&n's with a gallon of oil on them.
Link Posted: 1/5/2012 10:19:12 PM EDT
O2 sensors will cough up a code whenever they feel like it.. I wouldn't worry one bit about it.
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