1996 Rough Running Powerstroke
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From: MN
1996 Rough Running Powerstroke
The engine seems to go back and forth from running perfectly fine to acting like it is only running on 4 cylinders.......very rough and no power. The check engine light also comes on. The error code is 470 which is exhaust back pressure sensor circuit error. Any thoughts on the fix?
Thanks in advance,
CK
Thanks in advance,
CK
Mountain Pass
Joined: Dec 2003
Posts: 170
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From: Loudoun, Va
the running on 4 cylinders part is typical of broken, unhooked, or burnt wires associated with the wires inside the valve covers, the valvecover gaskets , or wires running to valvecover gaskets, however you should be getting a "internal mod. KAM error"
with the code you are getting I am leaning more towards the EBPV actuator keeping the EBPV closed when it shouldnt be. You can disconect the wiring to the actuator by unpluging the two prong connector located on the front right part of turbo pedestal and see if that fixes it. If so then you can attempt to figure out what is causing it to close.
p.s. the wires to the actuator are the only wires that connect anywhere to the turbo or turbo pedestal.
with the code you are getting I am leaning more towards the EBPV actuator keeping the EBPV closed when it shouldnt be. You can disconect the wiring to the actuator by unpluging the two prong connector located on the front right part of turbo pedestal and see if that fixes it. If so then you can attempt to figure out what is causing it to close.
p.s. the wires to the actuator are the only wires that connect anywhere to the turbo or turbo pedestal.
Last edited by RynL88; Nov 15, 2004 at 05:27 PM.
Mountain Pass
Joined: Dec 2003
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From: Loudoun, Va
well it could be only one injector although you mentioned earlier that is sounded like it was running on 4 cylinders, which means 4 injectors. Since its extremeley unlikely for four injectors to stop working independently of each other, i suspect either the left or right bank is shorting out causing your symptoms. you can unplug the connector that goes into either left or right valve cover (one at a time, with ign. off) and start it up to see if you get the symptoms you are describing. Please be careful as the voltage running through those wires is very high when energized. I would change the fuel filter too just to rule it out(drain the water at the same time) Then we'll go from there.
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As i have been analyzing the problem, it seems to be getting worse. Now it is difficult to keep it running(cooler evening, I suppose). One guy said he heard that low oil could cause issues. I checked the level and it was below the add mark. I added a couple quarts. Still runs terribly rough.
Can you check for power at the plugs by turning the ignition on and off?
Can you check for power at the plugs by turning the ignition on and off?
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New User
Joined: Sep 2004
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From: MN
About 1000 miles.
I'm running out of ideas. I have:
1) put in fuel additive
2) changed fuel filter
3) checked air filter
4) checked for exhaust restriction (based on error 470 that continues to read)
5) added oil as I heard that fuel pressure is supplied from oil pressure
Other ideas I have heard:
1) check crank sensor for cracks
2) check wiring on heads - now engine runs so rough, it would be tough to evaluate
Any more ideas??? I am just about ready to tow my baby to the dealer - what a crime that is.
Thanks guys!
I'm running out of ideas. I have:
1) put in fuel additive
2) changed fuel filter
3) checked air filter
4) checked for exhaust restriction (based on error 470 that continues to read)
5) added oil as I heard that fuel pressure is supplied from oil pressure
Other ideas I have heard:
1) check crank sensor for cracks
2) check wiring on heads - now engine runs so rough, it would be tough to evaluate
Any more ideas??? I am just about ready to tow my baby to the dealer - what a crime that is.
Thanks guys!
Mountain Pass
Joined: Dec 2003
Posts: 170
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From: Loudoun, Va
wow, below the add mark-with only one thousand since oil change. hmmm are you sure when you changed the oil that it was filled with correct amount. when you say its running rough is it smoking a lot too? with the loss of oil and symptoms progressivley getting worse kinda sounds mechanical and not electrical which may be why you aren't getting any DTC's. What about injector O-rings guys. Personally I've never had any experience with these so this is just a shot in the dark.
Postmaster
Joined: Feb 2002
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From: Bonney Lake, WA
My experience with bad injector O-rings was a catastrophic failure on one injector. My truck ran very rough, and the hammering from that one injector shooting blanks made it very obvious that the truck shouldn't be run.
As I read through this post, I'm siding with Kwik on this. I'd check for wiring under the valve covers as a likely source of the problem.
The original report was that the truck appears to be running on four cylinders. If even one injector isn't firing, the truck runs rough enough to make you think it's got four bad cylinders.
I wouldn't limit the search to only the wiring under the valve covers. I'd also inspect the wiring harnesses that connect to the valve covers on the outside. I've had recent experience with an intermittent glow plug problem, and it turned out to be one of the pins in the wiring harness connector.
Good luck and keep us posted.
As I read through this post, I'm siding with Kwik on this. I'd check for wiring under the valve covers as a likely source of the problem.
The original report was that the truck appears to be running on four cylinders. If even one injector isn't firing, the truck runs rough enough to make you think it's got four bad cylinders.
I wouldn't limit the search to only the wiring under the valve covers. I'd also inspect the wiring harnesses that connect to the valve covers on the outside. I've had recent experience with an intermittent glow plug problem, and it turned out to be one of the pins in the wiring harness connector.
Good luck and keep us posted.
