The other day, when I started it, it almost died twice, but it ran ok all the way to work. (about 35 miles) It is throwing code P1401.
SOURCE: 96 cavalier 2.4 starts runs great -chokes
Check the crankshaft position sensor. If the plug is loose or the sensor itself is bad it will cause similar problems
SOURCE: 1995 Chrysler Concorde
the alarm is activating when he locks it and for some reason the key or fob isnt deactivating it..check the disarm switches in the door
SOURCE: 1991 Dodge Dakota 3.9L new altenator but won't stay charged
Double check all connections are clean & tight. You need to get a voltmeter and have the voltage tested at battery with engine off & running. Drive it to the Napa shop you bought the alternator from if necessary, they should perform test free of charge, as the possibility of a faulty one is not out of the question, provided all is connected properly. Did you check that a main fuse for alternator wasn't blown in Uunderhood power distribution box?
SOURCE: P1401 AND P1311 CODE ON FORD EXPEDITION 2002
P1401 DPFE (Differential Pressure Feedback EGR) circuit high input: This code is in reference to the actual EGR valve monitoring sensor(DPFE). The actual circuit is damaged, thus, producing false negatives.The silicone rubber vacuum lines going to the sensor could also be faulty, as well. I would suggest to inspect the vacuum hoses that run to and from the DPFE sensor. If the hoses are in good shape; Replace the sensor, itself.
You could also check the EGR valve for faults, as well. If you have access to a hand vacuum pump, you can check the EGR passage quite easily with this device. Once you have gathered your pump; Disconnect and plug the vacuum line going to the EGR valve. Connect the vacuum pump to the EGR valve. Start the car and let it idle. Now, apply a simulated vacuum effect with the hand pump to the EGR valve. Your engine should stumble or stall if the passage is open. If it doesn't, the passage is clogged or the diaphragm in the EGR valve is bad. If the passage is open, it's most likely the DPFE sensor.
P1311 Ionization Misfire Detection Module Communication Fault: This code is not a normal ford code. With that said; I would advise to inspect all wiring that is running to the coils on this engine. This code will usually point to a failed coil or coil wire connection. i would also have each coil on this engine tested for their operational value. Check the entire engine harness for pinching or any damage that my be present.
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