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2000 Expedition 4.6 and PCM issues

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Old 02-05-2016, 11:04 AM
RW1998
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2000 Expedition 4.6 and PCM issues

I am working on a 2000 Expedition 4.6 and the PCM sets codes but the check engine light never comes on with the key on nor when it sets a code. Fuel economy is horrible and the following codes are identified. P0430 Catalyst Bank 2 Efficiency below threshold, P0401 EGR Flow insufficient and P1443 Manufacturer Control Auxiliary emission controls. Anybody have any ideas where I should start.
 
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Old 02-05-2016, 11:24 AM
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the check engine light never comes on with the key on nor when it sets a code.
The bulb is likely burned out.

P0430, P0401 and P1443
Very likely three (and likely more)separate issues.

Recommend you fix the MIL first so it works, then reset the DTCs, drive it until it codes out, and fix one issue at a time as they appear. There are too many subsystems with fault codes for a single failed item except perhaps a vacuum leak (they usually trigger "lean" codes) to cause.

That also suggests to me that there's quite a bit of accumulated neglect that needs to be corrected, probably due to the non-functional MIL.
 
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Old 02-05-2016, 11:43 AM
RW1998
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FYI, I was checking EGR components and the DPFE has 4.9 volts at the signal wire at cold start. Is this normal or should this voltage not rise prior to the engine heating to a normal heat range.
 
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Old 02-05-2016, 12:13 PM
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Old 02-05-2016, 01:52 PM
alloro
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Originally Posted by RW1998 View Post
Anybody have any ideas where I should start.
About the only common factor between those 3 codes I can think of would be a clogged catalytic converter on the driver's side. Have there been any sever engine misfires as of late?
 
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Old 02-05-2016, 05:09 PM
RW1998
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Yes. When the elderly couple first brought the vehicle it had the EGR code and cylinders 5,6,7, and 8 misfires and lean condition on bank 1. I found the PCV line had a large hole and the throttle body holes plugged from the EGR valve. I corrected those conditions. Cleared the codes and tested the vehicle and cylinders 7 and 8 repeated misfires. I then removed plugs and coils from cylinders 7 and 8 and tested coils and compression and all tested good. I swapped plugs and coils with cylinders 5 and 6, cleared the codes and retested engine operations. The EGR code and cylinder 5 misfire set. I swapped #5 coil and plug with cylinder 4, and cleaned #5 fuel injector and swapped with #6 and cleared codes and retested engine. It then set only EGR fault found. I checked the EGR valve its vacuum valve and DPFE valve and all test good. I retested the engine and it set the 3 codes above. Later I decided to put in a bottle of fuel system cleaner and I figured to clear the codes and put it to a very vigorous test. I performed flawlessly and the scanner passed no faults found. You think it still might be a catalytic convertor stopping up.
 
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Old 02-06-2016, 08:27 AM
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Originally Posted by RW1998 View Post
Yes. When the elderly couple first brought the vehicle it had the EGR code and cylinders 5,6,7, and 8 misfires and lean condition on bank 1.


You think it still might be a catalytic convertor stopping up.
Misfires are the kiss of death for catalytic converters, and that vehicle had 4 of them on the same bank. Testing for backpressure is the only way to know for sure at this point, but if I had to I would "guess" the probability of a clogged cat as high.
 
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Old 02-06-2016, 06:50 PM
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I would place the probably of a bad cat as pretty much a sure thing. The catalyst is surely ruined.

Whether it's clogged or not is not discernible from the given data. A clogged cat usually will allow the engine to run at idle but it chokes with any throttle. A back-pressure test will indeed answer that question, though.
 
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