Question about 1998 Buick LeSabre
Car runs fine other than a slight hesitation on acceleration. P0171 Code still exists after replacing fuel filter and gas cap. Also, checked air intake for any leaks to permit to much air into system. At a loss what to check or do next?
PO 171 indicates a lean condition in bank 1 or the same side of the engine as the first cylinder , usually it is caused by a vacuum leak some where check to make sure that even the smallest of vacuum hoses are in good condition and not leaking
Posted on Dec 05, 2008
Po171 is your mass air flow sensor. An expensive part but worth the money
Posted on Mar 02, 2009
YES I SOLVED THIS!
There is a recall in ford focuses for the fuel pump. If anyone goes to the Ford dealership and complains about acceleration, hesitation, or stalling will get a new fuel pump with models after 2000. P0171 is the trouble code for this, it means that the pistons aren't getting enough of fuel versus air.
Posted on Mar 22, 2009
Just an off the wall, out of the box thought. Possibly the intake manifold plenum has cracked allowing more air to enter the combustion chamber causing the "vacuum leak" symptom of a lean condition. Often times, a leaking plenum will exhibit symptoms similar to a blown head gasket, such as misfire in the morning with plumes of water vapor and a noticeable decrease in water volume in the reservoir. Bank 1 indicates the O2 sensors location in the system. Bank 1 is the O2 Sensor just before the bend to the catalytic converter and Bank 2 is positioned right after the cat.
Posted on Feb 09, 2015
What are your fuel trims reading on both banks that is the best way to diagnose lean conditions if fuel trims are jumping around you deffinetly have vacumn leak after mass air flow sensor
Posted on Feb 12, 2015
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