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I need to mull on that one.... My gut reaction is it would pretty much need to be no compression in one or more cylinders to suck the boost down, and I doubt he'd list low boost as his primary concern.
Then... there's always an inaccurate MAP sensor (very rare). KOEO while watching MAP, EBP, and BARO to see if they all sync up.
Like Rich suggested, check MAP, Baro & EBP on a cold engine with Key On Engine Off. They should all read the same as Baro and be within a few tenths of each other.
I can't read Baro, but EBP is 1 and MAP is 14, KOEO, cold.
Rob, your reading of 1 EBP, this might be the voltage reading which is correct (depending on your elevation). Can you verify if this is voltage or PSI?
You can also test to see what the PCM is seeing by disconnecting the EBP sensor on the front of the engine.
An EBP signal that is detected out of range by the PCM will cause the engine to ignore the EBP signal and disable exhaust back pressure operation.
Your scanner display should show a fixed PID value of 43.5 PSI (300 kPa) for EBP when exhaust back pressure is in default/unplugged.
Rob, your reading of 1 EBP, this might be the voltage reading which is correct (depending on your elevation). Can you verify if this is voltage or PSI?
You can also test to see what the PCM is seeing by disconnecting the EBP sensor on the front of the engine.
An EBP signal that is detected out of range by the PCM will cause the engine to ignore the EBP signal and disable exhaust back pressure operation.
Your scanner display should show a fixed PID value of 43.5 PSI (300 kPa) for EBP when exhaust back pressure is in default/unplugged.
Can't tell if it's psi or volts. I'll unplug it and get back to you. Thanks
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