P0171 System Too Lean Bank 1 Fixed - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > Air Induction

Air Induction Performance Air Intake/Air Induction Modifications

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  #1  
Old 09-15-2018, 11:30 PM
Tom Winegar Tom Winegar is offline
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2006 Chevy TrailBlazer LT
Graphite Metallic 5.3L V8 4X4
Join Date: Feb 2018
Location: Midwest
Posts: 20
P0171 System Too Lean Bank 1 Fixed

I checked for vacuum leaks and it turns out the small cap was missing from the vacuum fitting on the back of the intake manifold allowing a vacuum leak. Not sure when it was eliminated but the vacuum fitting hole on the side of the Air Cleaner Intake Resonator is sealed over. I idled the engine to confirm the vacuum leak and then slipped a rubber cap on the manifold fitting to block the leak. I used my scanner to delete the P0171 code and now the check engine light is off and the car has more power.
In the years before computers an engine with a vacuum leak that big would have run rough and most likely would have stalled at idle.
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  #2  
Old 10-02-2018, 07:58 PM
Inferno333 Inferno333 is offline
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2006 Chevy TrailBlazer LT
Bordeaux Red Metallic 5.3L V8 4X4
Join Date: Mar 2011
Location: Waterloo, Iowa
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Do you have any pictures of the port you sealed up? I'll be replacing my intake manifold this weekend in an effort to fix a couple issues.
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  #3  
Old 10-30-2018, 01:26 AM
Rocks76 Rocks76 is offline
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2006 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Mar 2018
Location: NY
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Hey Tom, I've been battling this code for a long time now. Threw some parts at it. Was going to get a smoke test next. Could you please show a pic of the exact fitting u were referring to?
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  #4  
Old 10-30-2018, 10:54 PM
Tom Winegar Tom Winegar is offline
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2006 Chevy TrailBlazer LT
Graphite Metallic 5.3L V8 4X4
Join Date: Feb 2018
Location: Midwest
Posts: 20
Find #23 in the diagram, that is the rubber plug that slips over the nipple located on the intake manifold. Without the plug you'll have a massive vacuum leak.

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  #5  
Old 10-31-2018, 12:11 AM
Rocks76 Rocks76 is offline
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2006 Chevy TrailBlazer LS
Midnight Blue Metallic 4.2L I6 4X4
Join Date: Mar 2018
Location: NY
Posts: 7
Really appreciate that Tom. Looks like Haynes. Obviously I don't own one. SO, when I was replacing the Purge Valve today and general inspection of all air related components, I FIND THE PCV VALVE IS OFF THE NIPPLE! CHRIST! It's been like that for 9 I don't wanna say how long) from when I cleaned and inspected throttle body. Must have never made it back on :-( Let's see what happens now with the TC's and the damn computer. ***Trying to clear 0171 & 0496.***
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