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1996 F250 with a 1997 7.3 in it, as well as a 6-position chip
Shut off while driving and refused to restart. Replaced cam sensor even though the one in it was only a couple weeks old. Checked fuel filter, which is also a couple weeks old, it was clean as a whistle.
Towed it home. If I popped the clutch it would start and idle, but if I tried to drive it it would die within a mile. Now it will start with the key, sometimes it will idle rough for a bit before it smooths out.
Has thrown the following codes:
1280
0340
0470- has been throwing this code since before it started acting up
Also, heres the readings I got when i hooked up my SCT X4 from my other 7.3 to it. These are at warm idle.
Update: cleared the codes to see if it threw any again. Other than a rough start that might be due to cold weather, haven't had any issues. I drove it to my diesel shop for their help with diagnosis and it never skipped a beat on the 25 mile drive and didn't throw anymore codes.
Exhaust backpressure looks awful suspicious to me. Doesn’t that convert to about 180 psi? EBPV stuck closed? But even if it was I don’t know if it could develop 180 psi.
I dont think my scanner will read High pressure oil. I just had a new HP pil pump and injector O-rings installed, so it should be good unless a new part was defective.
Im fairly certain the exhaust reading is due to a clogged tube going to the sensor or a bad sensor. Been meaning to clean it out and check the sensor, but the truck has been running fine for a while now with that reading.
I dont think my scanner will read High pressure oil. I just had a new HP pil pump and injector O-rings installed, so it should be good unless a new part was defective.
Im fairly certain the exhaust reading is due to a clogged tube going to the sensor or a bad sensor. Been meaning to clean it out and check the sensor, but the truck has been running fine for a while now with that reading.
I bet it does. If it will read other parameters as posted I'm sure it will read HP oil values too. Most back pressure a stock truck would create is about 43 PSI and that's with the EBPV closed. so yes the sensor is probably bad. A bad or clogged tube would give atmospheric numbers only with no change when driving.
I dont think my scanner will read High pressure oil. I just had a new HP pil pump and injector O-rings installed, so it should be good unless a new part was defective.
Im fairly certain the exhaust reading is due to a clogged tube going to the sensor or a bad sensor. Been meaning to clean it out and check the sensor, but the truck has been running fine for a while now with that reading.
Just reviewed the data above you posted and bottom right parameter as posted is indeed HP oil values. 4.02 MPa = 583 PSI. Don't know how I missed that and the number is good for warm idle.
Thank you all for your help. Ended up being something simple, and now I feel ignorant. The tin-nut on the IPR had vibrated just loose enough to cause and issue. Truck is back up and going great.
Still gonna check the Exhaust Pressure Sensor, but having to focus on fixing my other non-running truck at the moment, when it rains it pours!
That exhaust backpressure sensor has to be the least understood component on our engines, at least in my case. I'd about decided that allit did was provide an input to the EBPV position but I keep reading about it doing other things. I have a copy of the Electrical and Vacuum Troubleshooting Manual, maybe I can find a diagram or some sort of definitive answer.
Hi Bob, you are correct that the exhaust back pressure sensor only controls the position on the EBPV, duty cycled, on cold mornings. There is no feedback to the PCM from the EBPV. The PCM is commanding the valve to close a certain percent, to heat up the engine quicker, but really doesn't know what it it's doing The only feedback the PCM uses is the exhaust back pressure sensor to ensure not too much back pressure is applied when demanding power. Over the years monitoring this value, on cold mornings driving, the value were usually in the mid 20 PSI and one time I saw 43 PSI. Quite often in the mid 30 PSI. This is just cruising down the road with no need to accelerate. Unfortunately if you need to accelerate quickly it takes the valve a few seconds to open to gain full power, that's why most just delete it.
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