Question about 1999 Chevrolet Silverado 1500
171 is posting right fuel trim is lean
174 is posting left fuel trim is lean
can be faulty injectors not opening all the way it seems
Posted on Jul 10, 2010
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Posted on Jan 02, 2017
Check for vacuum leaks, especially the intake manifold gaskets. If those are o.k., clean the Mass air flow sensor.
Posted on Apr 12, 2009
SOURCE: code po171 7 po174
your computer is reporting bank 1 and 2 too lean, usually caused by the mass air flow (MAF) sensor, you can usually clean this sensor and reset the light. Clean it with electric cleaner or brake cleaner, make sure it is dry before reinstalling, also take care not to damage it. Hope this helps, let me know
Posted on Jun 09, 2009
This is the engine lean code. Too much air is entering the engine. Intake manifold gaskets can leak, vacuum lines get old and crack. Check the operation of the EGR and PVC valves, In short it is not easy to find the problem.
Posted on Oct 01, 2010
SOURCE: codes po171 and po174 0n
It sounds like you running lean; too much air, not enough gas. Possible solutions include:
Go to these links to get some additional information:
Possible solutions include:
Posted on Mar 02, 2011
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