P0 171

[chucc tayor]

my buddy has a 07 trailblazer ss....this code pop up a couple days ago.....p0171 system to lean bank 1.......i checked fuel pressure, fuel filter , injectors, no vacuum leaks ,all is working and within spec. ialso cleaned the MAF sensor..there is no acceration issues, hesitations, high idle or lack of power..i was wondering if there was a resistance check or voltage check for this MAF sensor....jus seeing if maybe im missing something

[bobcat5544]

Document ID# 1969234

2007 Chevrolet TrailBlazer - 4WD

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Subject: Fuel Trims Reading Lean or Engine Oil Leak - keywords 06 07 5.3 5.3L 6.0 6.0L P0171 P0174 block core dipstick DTC engine freeze galley H02S idle indicator leak lean level LH6 LS2 02 oil plug rough SES #PIP4038A - (05/07/2007)

 

Models: 2006-2007 Chevrolet Trailblazer, Silverado Classic

2006-2007 GMC Envoy, Sierra Classic

Equipped with a engine RPO codes LH6 or LS2

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This PI Supercedes To Include LS2 6.0L Engine. Please Discard PIP4038.

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

The customer concern may be rough running, a SES light, lean codes P0171/P0174, or an engine oil leak.

 

Recommendation/Instructions:

Complete the current SI diagnostics for any trouble codes or symptoms found.

 

If a vehicle has come to dealer with rough running, a SES light, lean codes P0171/P0174, or an engine oil leak, inspect for a missing or loose oil indicator tube plug.

 

The 5.3 and 6.0 V-8 engines have a extra dipstick/oil level indicator hole located on the lower right side (passenger side) of the engine. On certain vehicle applications the oil level indicator hole on the right side of the block is not used. This hole is plugged with an engine oil gallery plug if it's not utilized. If the block plug is loose or missing, it can cause the lean condition or an engine oil leak. Use SI procedures for Engine Block Plug Installation to install the new oil level indicator plug.

 

GMSPO does have a parts listing for the Oil Indicator Tube Hole Plug, and the current part number plug (or equivalent) should be used for this repair.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

ALSO

 

P0171 AND P0174 Inspect For Cracked Or Leaking PCV Pipe - keywords alcohol cover crack DTC fuel hose idle injector intake leak lean long MIL misfire 4.8 5.3 6.0 6.2 L76 L92 LC9 LH6 LR4 LY2 LY5 LY6 #PIP3918A - (02/27/2007)

 

Models: 2007 Cadillac Escalade

2007 Chevrolet Avalanche, Express, Silverado, Suburban, Tahoe, Trailblazer

2007 GMC Envoy, Savana, Sierra, Yukon

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This PI was superseded to update models and engines. Please discard PIP3918.

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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

 

Condition/Concern:

A vehicle may be brought to the dealer for a rough idle and a SES light on. DTCs P0171 and P0174 may also be found.

 

Recommendation/Instructions:

Complete the current SI diagnostics for any symptoms or trouble codes found. During diagnosis inspect for a leaking or cracked PCV pipe. The PCV pipe is covered with insulation, and the covering could make it difficult to hear a vacuum leak.

 

Repair or replace the PCV pipe as needed.

 

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

[gmtech4]

my buddy has a 07 trailblazer ss....this code pop up a couple days ago.....p0171 system to lean bank 1.......i checked fuel pressure, fuel filter , injectors, no vacuum leaks ,all is working and within spec. ialso cleaned the MAF sensor..there is no acceration issues, hesitations, high idle or lack of power..i was wondering if there was a resistance check or voltage check for this MAF sensor....jus seeing if maybe im missing something

 

 

does your buddy have any warrenty left?,your missing the way to the dealer