P1247 & Po783 Codes
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P1247 & Po783 Codes
Hey Everyone, Pulled these two codes last night (p1247) and (po783), the truck starts but runs extemly rough and doesnt shift from 3-4 all the time. Could these two be related?? Any help would be appreciated... Eric
2000 F-350 7.3 Diesel
Gauges
Superchips Programmer
2000 F-350 7.3 Diesel
Gauges
Superchips Programmer
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From: 21791
well, the P0783 is 3-4 Shift Error. that is all the code says, so i can't elaborate. the P1287 is an IDM or high voltage circuit error, P1297 High Sides Shorted Together. this is why it's running rough, one or more cylinders seem to be firing at the same time if two or more injector wires (carrying 115V) are shorted to each other, both or more will fire at the same time.
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Thanks for the response, but the code was P1247 not 1287. I did a little research on here and other guys have had bad Vss Sensors that tripped the 1247 code and the Vss Sensor "talks to" the tranny to enable it to shift at the proper moment. Is this any where close to right?? If it is wouldn't that be tripping the PO783 Code.. It would be great if that is the problem. As those sensors arn't to bad money wise.. Thanks Eric
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From: Middle Tennessee
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From: Middle Tennessee
Eric, boost low indicates a leak. Could be anywhere from the compressor all the way to the heads. Check all boots. Could also be caused on the turbine side with a EBV problem or even back to a sticking waste gate. Believe it or not, it could also come from the MAP sensor tubing/connections therefore the computer is not seeing the expected boost for the conditions and will not send the coals to the oven.
Now the shifting thing will have to await somebody smarter than me. I am not sure where the puter references it's data for speed to shift. Maybe it all does come from the VSS but I am still awaiting a better manual.
Now the shifting thing will have to await somebody smarter than me. I am not sure where the puter references it's data for speed to shift. Maybe it all does come from the VSS but I am still awaiting a better manual.
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Morning, Quick question.. Would a boost leak make the truck run that rough? It acts like its only running on half the cylinders? I'm tearing into it today after work so hopefully it's nothing serious. Eric
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Originally Posted by gramses
Morning, Quick question.. Would a boost leak make the truck run that rough? It acts like its only running on half the cylinders? I'm tearing into it today after work so hopefully it's nothing serious. Eric
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Just an update, Pulled the exhaust back pressure sensor off and the mounting and the sensor was full of carbon. I cleaned the tube out and the mounting bracket and cleaned the sensor out as much as I could and put everything back together and now I pull a PO470 code. So I'm assuming the sensor probably works, but is so corroded with carbon inside it needs to be replaced. Am I right in this assumption or is there a cleaner to completly clean out all of the carbon? Thanks Eric
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No, a boost leak will not cause the truck to run like on only 50% of the cylinders unless it is the mother of all of them and even then it will just run like a dog not wanting to get out of it's own way. Dan has a point, check your UVC wiring, if that is grounding or shorting, or disconnected, it will run like that and I can't say for sure but I'll bet ya can't make boost when that is happening.
Why did you service the exhaust backpressure sensor? Are you still getting the same other two codes?
I will now think aloud, disclaimer, just my thoughts, if you ensure you have no boost leaks, and the UVC wiring is in order, then make sure you are getting the fuel to the cylinders. I believe that you will/cannot make boost on a sick engine and when you cannot make boost, the tranny may not want to shift properly because the expected power (even without boost due to problem) is not present. JMO.
Why did you service the exhaust backpressure sensor? Are you still getting the same other two codes?
I will now think aloud, disclaimer, just my thoughts, if you ensure you have no boost leaks, and the UVC wiring is in order, then make sure you are getting the fuel to the cylinders. I believe that you will/cannot make boost on a sick engine and when you cannot make boost, the tranny may not want to shift properly because the expected power (even without boost due to problem) is not present. JMO.
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From: Central, Al
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From: Middle Tennessee
Originally Posted by amiller93
Tenn...You wont need to after the DVD gets in next week
Now that you have snuck that mod in after the foil delete in your sig, you need to post some observations. Make sure to get some good seat time. If you notice a drop in initial low end, like strokin-it says, it will be gone with a chip. And I've done it again.
I hope nobody tracks these things.
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From: Central, Al
Tenn ..coming soon to a theater near you
Im gonna take her down the road Monday and get a good datalog to see how all the sensors react to the change and the butt dyno results.
BTW foil delete is no good now... cant hear the compressor whistle for the turbine whine
Im gonna take her down the road Monday and get a good datalog to see how all the sensors react to the change and the butt dyno results.
BTW foil delete is no good now... cant hear the compressor whistle for the turbine whine
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From: Middle Tennessee
Originally Posted by amiller93
Tenn ..coming soon to a theater near you
Im gonna take her down the road Monday and get a good datalog to see how all the sensors react to the change and the butt dyno results.
BTW foil delete is no good now... cant hear the compressor whistle for the turbine whine
Im gonna take her down the road Monday and get a good datalog to see how all the sensors react to the change and the butt dyno results.
BTW foil delete is no good now... cant hear the compressor whistle for the turbine whine
On a seperate note, I was behind another PSD the other day that just whistled like there was no tomorrow. Must have been WW. I didn't like the sound of it and wanted to smoke it. I know, bad etiquette but I could hear that whistle over my system and it was pissing me off.
I wanted to see what he had, yeah, me with the job I have and all. Well, he was a she and she turned off and that was that. Probably for the best.Sorry grams, we'll get back to your post here when you update us.
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