Question about 1998 Oldsmobile Silhouette
Check the metal line that comes off the exhaust and make sure it isnt plugged with carbon. also remove the egr and check the port and see it's clogged as well
Posted on Nov 17, 2009
I have replaced the EGR valve as well as remove the manifold intake and cleaned it I'm still getting default codeI also have check for any hoses that are leaking and all the hoses are when running OKI don't know what else to do
Posted on Mar 31, 2015
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Posted on Jan 02, 2017
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P0401....Exhaust Gas Recirculation Flow Insufficient Detected
best advice with the EGR valve problem is to make a gasket with a coca cola can and sel it off completely
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Insufficient EGR Flow
What does that mean?
EGR stands for Exhaust Gas Recirculation. It is part of the vehicle emmissions system, and is used to reduce combustion temperature and pressure to control Oxides of Nitrogen. There are generally three parts to the EGR system: the EGR valve, an actuator solenoid, and a differential pressure sensor EGR (DPFE). These things work together to deliver the correct amount of recirculation based on engine temperature, load, etc. The P0401 code means that OBD detected an insufficient amount of EGR.
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You may notice drivability problems such as pinging (a.k.a. pre-ignition knock) when the engine is under load or the vehicle is at higher speeds. There may also be other symptoms.
A code P0401 most likely means one or more of the following has happened:
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
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