Question about 1995 Ford Taurus
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Posted on Jan 02, 2017
I would check the front o2 sensors because usually the EGR flow is detected by:
The detect operation of the system, the solenoid is disabled and the o2 compensation control is monitored. If the EGR system is operating properly, turning it off shifts the air/fuel ratio in the lean direction. o2 sensor data should indicate an increase in oxygen in the exhaust gases and cause the short term control to shift rich. The amount of the shift indirectly monitors the operation of the system.
Posted on Oct 13, 2008
SOURCE: 2002 ford focus p0401
Here is a list of possible causes for a PO401, hope this helps.
Posted on Feb 10, 2009
SOURCE: 1991 ford f250 5.8l VIN H
In all the technical data I have access to Snap-on, Mac, AllDATA and most service manuals all tell you to start with a wiggle test and clean all grounds.
Wiggle test means wiggle the wires and connectors while te engine is running and see if there is a change in performance. I suggest unplugging the connectors one by one and doing a visual inspection on them, look for green corrosion rust oxydized connections etc, add a little bit of di-electric grease and plug it back in, for the grounds that are bolted on remove these but be careful not to break off the rusty ones then use 400 grit sandpaper and shine up the mating surfaces add some di-electric grease and re install. Before you start to clean the connectors and grounds remove the neg off the battery, it will reset the check engine light if left unplugged for 30 mins
Posted on Mar 23, 2009
What you will find under the airhorn is a $10 gasket covering a half circle groove with a straight line in the center. When this is clean everything will work. Remember to purge the error codes.
I understand that the old intake manifolds were aluminum. Ford changed the intakes to plastic after at least the 1994 models. Could be 95 on. The carbon deposits really stick to aluminum.
After spending $450 on parts and taking the car back 6 times for a Error 401 the shop admitted it could not fix all the cars with that code.
I was lucky enough to meet a Cop-shop mechanic who worked on all the police cars and city vehicles. I asked him about my car and he told me about the 8 bolts and the $10 gasket and to clean the port under the airhorn. Did it once and it stayed fixed. Had a 2002 and another 1999 did the same thing even with a plastic manifold on the 2002.
Had a code 401 come up in your article I would have told you about my experiences. Glad you found it. Basically the EEC knows it is short on vacuum but blames the electrical parts instead of carbon problems.
Posted on Sep 03, 2009
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