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P0401 Exhaust Gas Recirculation Flow Insufficient Detected
Remove the EGR valve and clean up passage ways using spray on carburetor/fuel injector cleaner.
p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.
Cylinder misfiring hapens when ignition coil is bad and bad spark plugs.
System to lean is usualy when fuel pump lose pressure or you have blown gasket on intake manifold. Check fuel pressure first.
When EGR flow is insufficient there is EGR valve, sensor and solenoid, could go bad., so you have multiple codes P0171, P0304,P0306, P0401
if the check engine light is blinking,you have a misfire(spark plugs,plug wires or coil pack.inspect the plug wires for damage.The rear bank plug wires (at the fire wall) get alot of heat and the boots will crack, causing a misfire.You might want to have your local shop check it for you,to see if there is an open circuit or shorting in one or more of the plug wires.if it has been awhile since a tune-up,you might want to do that first,and inspect the plug wire boots also and replace them if needed.
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