I have a 2009 Aveo5. Keep getting code P0171. Car surges during acceleration and sometimes tries to stall. I have checked for vacuum leaks and cleaned MAFS. Use car for work. Please help.
There are a few issues that could cause this problem. First PO171 is a lean mixture condition; this could be caused by a vacuum or fuel issue like a poor fuel delivery or clogged fuel infectors.
The average long term fuel trim cell values are greater than 30 percent for 10 seconds.
Splits, Kinks, or improper connections at the vacuum hoses.
Vacuum leaks at the intake manifold, throttle body, and injector O-rings.
Leaking crankcase ventilation system.
Missing, leaking restricted or leaking exhaust.
The fuel system is operating lean.
The fuel injectors are operating lean.
These are a few areas that can cause a code PO171 and related drivability problems.
Check your fuel pressure, amount of fuel delivery for 15 seconds. If those look good try having your fuel injectors cleaned by a professional mechanic, they have a special cleaner to run through the fuel rail to clean the injectors.
Check out these areas and let me know if you need extra help.
There is also a recall on the ignition, I listed it below.
# 11290C: Product Emission - Degraded Connection Between Ignition Coil Spark Plug Boots and Spark Plugs - (May 28, 2013)
Subject:11290C - Degraded Connection Between Ignition Coil Spark Plug Boots and Spark Plugs
Models: 2009-2011 Chevrolet Aveo
2009-2010 Pontiac G3/Wave
Equipped with a 1.6L Gas Engine (LXV)
The Service Procedure section in this bulletin has been revised to include instruction on how to remove the coil boot with compressed air. Please discard all copies of bulletin 11290B
General Motors has decided to conduct a voluntary Emission Recall involving all 2009-2011 model year Chevrolet Aveo, and all 2009 model year Pontiac G3/Wave vehicles equipped with a 1.6L gas engine (LXV). A degraded connection between the spark plug boots on the ignition coil assembly and the spark plugs may cause the illumination of the Check Engine Soon light, rough engine operation, and lack of engine power.
Dealers are to install new spark plug boots and spark plugs.
All involved vehicles are identified by Vehicle Identification Number on the Investigate Vehicle History screen in GM Global Warranty Management system. Dealership service personnel should always check this site to confirm vehicle involvement prior to beginning any required inspections and/or repairs. It is important to routinely use this tool to verify eligibility because not all similar vehicles may be involved regardless of description or option content.
For dealers with involved vehicles, a listing with involved vehicles containing the complete vehicle identification number, customer name, and address information has been prepared and will be provided to dealers through the GM Global Connect Recall Reports. Dealers will not have a report available if they have no involved vehicles currently assigned.
The listing may contain customer names and addresses obtained from Motor Vehicle Registration Records. The use of such motor vehicle registration data for any purpose other than follow-up necessary to complete this recall is a violation of law in several states/provinces/countries. Accordingly, you are urged to limit the use of this report to the follow-up necessary to complete this recall.
Some of this information provided by the Alldata automotive information website.