EBPV is controlled by PCM when oil temp is low

EBP sensor does not command EBPV

 

Interesting. I've believed for years that the sensor provided input into the PCM for the BPV position. I didn't mean to sound like I thought the sensor controlled the valve directly without going through the PCM. I'm the first to say that you contribute a lot here and you know a lot more than I do. I still want to find some sort "official" diagram or explanation of what goes on with that sensor.

That Backpressure Valve is so troublesome that I'm surprised that Ford didn't get rid of it but I understand the 7.3 SuperDutys have it. I sure haven't missed it at all since I deleted it. Truck starts right up without a block heater and doesn't seem to take an excessive amount of time to warm up, but it rarely gets below +20F around here.

 

I don't want to get into any pissing contests, I really just like to understand how things work. Here is a direct quote from page 28-3 of the 1996 F150-F-450 Electrical and Vacuum Troubleshooting Manual under the heading of
Exhaust Back Pressure (EBP) Sensor. Anything not in between "quotation marks " is just my comments. Note that my manual covers only 1996, other years may be different:

"Measures analog output indicating exhaust back pressure. PCM uses information to control back pressure under cold conditions." That is all it does.

Under Engine Oil Temperature (EOT) Sensor:

" A thermistor in which resistance decreases as engine oil temperature increases. PCM detects voltage drop and uses information to help calculate fuel delivery, injection timing and exhaust back pressure."

So, the PCM uses input from both the EBP sensor and EOT sensor to control the exhaust back pressure. There could be other inputs to the EBP valve, I didn't read the whole manual, but it seems clear to me that if the exhaust back pressure valve is deleted, the input to the PCM from the EBP sensor doesn't do anything and a plugged EBP sensor tube isn't going to affect the engine operation. Any information to the contrary is welcome, this discussion of what that sensor does has been ongoing since I've been a member here and I'd just like to get to the bottom of it. I know there are opinions that performance increased when the EBP sensor was repaired even when the EBP valve was deleted. I consider those to be just opinions, just like my opinion that the EBP sensor does nothing other than provide input to the PCM to control the EBP valve position but at least there is documentation from Ford to support my opinion.