Ebp at .3 psi at idle?

amko22 · May 18, 2021

I have tried to find the values of what I should be getting from my exhaust back pressure sensor at idle. Had an issue with wiring a month or so ago and directly relayed to the ebps. What I have noticed over the last day was my EGT,s spiking very easily when I am loaded with about 15k towing, which has caused me to start looking at other parameters. From what I can tell on my CTS2 boost is fine, vgt is working (new turbo a few months ago) frp is good but my ebp seems to be low at idle. Now with no trailer just driving the EBP seems to act normal, increasing with acceleration and at cruising speed it comes back down and seem to correlate with boost as well. The exhaust brake works as it should but the strange this is when I unplugged the EBP sensor the tone of the motor changed for a few seconds then went back to normal. Drove it with the sensor unplugged and the monitor was reading like it was plugged in? I seem to remember the reading being higher then .3 at idle.

Any suggestions?

Truck is deleted with efi live (starlight tuning if I remember correctly)

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cwendel · May 19, 2021

Compare that pressure to map sensor when off first thing in the morning. They should match, if not replace the exhaust pressure sensor.

2013 2500 6.7 cummins crew cab. white and stock as can be
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mtnrider · May 19, 2021

I believe the CTS does some math to display the gauge so it won't read the same number as the MAP sensor. It subtracts the atmospheric pressure (map sensor data) from the back pressure measurement to give you a number (kind of like the boost reading). I would suspect at idle it should read somewhere around ~1 PSI and should go up as you add power or the exhaust brake comes on etc.

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cwendel · May 20, 2021

Those sensors and the the barometric sensor pid should all read the same before cold startup in the morning. That is how the manual calls to check them. The one that is different is the one to change.
And yess the boost is calculated, but is calculated by the difference between the intake manifold pressure sensor and the map sensor mount post filter/preturbo.

2013 2500 6.7 cummins crew cab. white and stock as can be
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Ebp at .3 psi at idle?

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