99 Ranger 2.5 P1401 Code
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99 Ranger 2.5 P1401 Code
99 Ranger, 2.5 engine, CE lite is on = P1401.
The engine starts right up, but idles a bit rough when cold.
At speed when running, seems to run just OK, but with little power. On the road, after slight deceleration, reacceleration is a bit rough, engine stumbles but eventually smooths out after a few seconds as if a valve, piston, whatever is taking its time resetting. Replaced the EGR valve with litle change in performance. When I installed a new DPFE the engine would hardly run. Bucked, skipped and wouldn't idle. Restart was nearly impossible. Checked the hoses - small hose on small nipple, large hose on large nipple. Elec connection tight. Put the old DPFE back on and the engine was back where I started.
Now what!!?
My old DPFE is the metal design. The only replacement DPFE I can find is the plastic type. Are they interchangeable?
In doing some research on the EGR system I found a site giving the specs on both types. Seems the metal style has a .055 or 1.0 volt null output, the plastic case style has a 1.0 volt null output. Is it necessary to match the plastic 1.0 volt DPFE with a new EVR?
I need to get this thing fixed.
The engine starts right up, but idles a bit rough when cold.
At speed when running, seems to run just OK, but with little power. On the road, after slight deceleration, reacceleration is a bit rough, engine stumbles but eventually smooths out after a few seconds as if a valve, piston, whatever is taking its time resetting. Replaced the EGR valve with litle change in performance. When I installed a new DPFE the engine would hardly run. Bucked, skipped and wouldn't idle. Restart was nearly impossible. Checked the hoses - small hose on small nipple, large hose on large nipple. Elec connection tight. Put the old DPFE back on and the engine was back where I started.
Now what!!?
My old DPFE is the metal design. The only replacement DPFE I can find is the plastic type. Are they interchangeable?
In doing some research on the EGR system I found a site giving the specs on both types. Seems the metal style has a .055 or 1.0 volt null output, the plastic case style has a 1.0 volt null output. Is it necessary to match the plastic 1.0 volt DPFE with a new EVR?
I need to get this thing fixed.
Post Fiend
Joined: Jan 2003
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From: Connecticut
That new DPFE sensor that you tried sounds like it's either the wrong one or it's faulty. Where did you get it?
If you look up the P01401 code HERE you will see that it gets set as a result of a check of the DPFE sensor circuit.
You can also check out the "DPFE EGR System Monitor" section in this article:
http://www.motorcraftservice.com/vdi...f/obdsm99a.pdf
So those things associated with the circuit should be checked. Examine and clean the harness connector (look for corrosion bent pins, etc.) and follow the harness to see if there are are any problems with the wires. For example, an open in the VREF wire would cause a P0401 since the voltage does not match the expected response.
A P0401 could also be generated for a "hose off" error which includes a plugged hose. So check the hoses to and from the DPFE for any problems.
If you look up the P01401 code HERE you will see that it gets set as a result of a check of the DPFE sensor circuit.
You can also check out the "DPFE EGR System Monitor" section in this article:
http://www.motorcraftservice.com/vdi...f/obdsm99a.pdf
So those things associated with the circuit should be checked. Examine and clean the harness connector (look for corrosion bent pins, etc.) and follow the harness to see if there are are any problems with the wires. For example, an open in the VREF wire would cause a P0401 since the voltage does not match the expected response.
A P0401 could also be generated for a "hose off" error which includes a plugged hose. So check the hoses to and from the DPFE for any problems.
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Originally Posted by Rockledge
That new DPFE sensor that you tried sounds like it's either the wrong one or it's faulty. Where did you get it?
Got it at Advance/Discount Auto. The service manager at the Ford dealership (I bought some new hoses to connect the DPFE and tried to pick his brain a little about the EGR system) seemed to find that a bit humorous. Fortunately I got my $$ back, so that took a little of the sting out.
If you look up the P01401 code HERE you will see that it gets set as a result of a check of the DPFE sensor circuit.
You can also check out the "DPFE EGR System Monitor" section in this article:
http://www.motorcraftservice.com/vdirs/diagnostics/pdf/obdsm99a.pdf
Plenty of good information there, Thanks much.
A P0401 could also be generated for a "hose off" error which includes a plugged hose. So check the hoses to and from the DPFE for any problems.
Got it at Advance/Discount Auto. The service manager at the Ford dealership (I bought some new hoses to connect the DPFE and tried to pick his brain a little about the EGR system) seemed to find that a bit humorous. Fortunately I got my $$ back, so that took a little of the sting out.
If you look up the P01401 code HERE you will see that it gets set as a result of a check of the DPFE sensor circuit.
You can also check out the "DPFE EGR System Monitor" section in this article:
http://www.motorcraftservice.com/vdirs/diagnostics/pdf/obdsm99a.pdf
Plenty of good information there, Thanks much.
A P0401 could also be generated for a "hose off" error which includes a plugged hose. So check the hoses to and from the DPFE for any problems.
I just hope it's not electrical. I hate electrical problems.
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I just vacuum tested the DPFE. Seems I read on another post (can't find it again) that one side needs to hold vacuum, the other side doesn't. Well, both sides hold vacuum. Does that mean I have a bad/clogged DPFE?
Is there a test for the Electronic Vacuum Regulator?
Is there a test for the Electronic Vacuum Regulator?
Post Fiend
Joined: Jan 2003
Posts: 9,748
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From: Connecticut
Originally Posted by Aufin
I just vacuum tested the DPFE. Seems I read on another post (can't find it again) that one side needs to hold vacuum, the other side doesn't. Well, both sides hold vacuum. Does that mean I have a bad/clogged DPFE?
Is there a test for the Electronic Vacuum Regulator?
Is there a test for the Electronic Vacuum Regulator?
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99 Ranger 2.5 P1401 Code
Read the Tomco tips, DPFE holds vacuum on both ports, probed connector. VREF voltage going in (?) is 5+, DPFE signal, key on engine off, is 5+ volts. According to everything I've read, the DPFE signal should be around 0.45V while "at rest". OK, bad DPFE. Disconnected and pluged the vac line to the EGR valve and went for a ride. Some of the symptoms went away, but after hard acceleration when I leveled off to cruise, the engine skips and stumbles. Still no where near the power and revup I remember, and dle is rough, but eventually tries to level off. With engine running at idle, and still skipping, disconnected the IAC elec connector. Not much change, but a little lower RPM. Disconnected the TPS. No change.
The skipping doesn't sound like a plug type misfire, but rather a softer skip. Hard to explain. All cylinders are firing according to a plug wire check.
I'm stumped on all this computer controlled stuff. Where next?
The skipping doesn't sound like a plug type misfire, but rather a softer skip. Hard to explain. All cylinders are firing according to a plug wire check.
I'm stumped on all this computer controlled stuff. Where next?
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