Seems about normal to me.

I went back and re-read your original post. I think the code you got is for the electrical valve at the pedestal and not the sensor itself (located at the front of the engine).

Part of the KOER test will attempt to actuate the EBPV and bump up the rpms while doing so. Have you done this test and if so, did you hear the valve closing? If not, then you might want to check your connector at the base of the pedestal to see if that connector came loose.

I am trouble shooting an identical problem right now on my wife's truck. PCM says to close the valve yet nothing is happening. I've narrowed it down to an electrical issue at the connector but haven't yet corrected it.

 

I just did a scan test on my other truck and the EBP(V) is at .90v. So my other sensor could be bad if it reads 1.15V?

 

Not sure how common that is but I suppose it's quite possible. Also possible that the push rod has come loose from the tab pin on the bottom of the butterfly valve itself. That would also throw the same code most likely.

 

Okay so my problem could be the EBPV solenoid on the pedistal? I notice that this truck I'mworking on is not as loud as my other truck. Could the valve be stuck or not adjusted right? So why is my idle more rough,after cleaning the EBP sensor? Could I have damaged it? Can I swap it out with my other truck?

 

I have heard of that before...

OP... might be off, but have you checked your ICP and IPR duty-cycle?

 

You should be able to swap the sensors if you want to try that. I think I read a thread a while back where someone disconnected the sensor and the engine ran smoother. Although I don't think this is your issue because your readings seem about normal.

Did you hear the back pressure valve close during the KOER test? Should be super obvious. If not, then I'd check the electrical connector or the push rod clip.

 

Yes ,What should those numbers be at?

 

I will try to swap sensors. Did they disconnect EBPS? Just the volts at idle is off my other truckis at .95v and this truck I'm working on is 1.15v could that be to much voltage?

On the back pressure valve yes I can hear but not as loud. My other truck is WAY WAY louder. I will check that connector.

 

Here is a photo that may help if you want to check and see if your valve is stuck.

 

Yes, they disconnected the electrical connector at the sensor at the front of the engine. You could try that and see if the engine runs smoother.

With the engine off, reach in there and feel the push rod and lever on both trucks and compare their positions. Does the truck with issues have it's lever in the same basic (open) position? If not, it may be stuck in a partially closed position.

Could also run the KOER test again and use my photo to compare if the lever moves far enough over towards the passenger side. Might only travel part way and that would also give you your code.

Truthfully, most people don't care if that valve closes or not just so long as it stays open. I use it for an exhaust brake so I like mine to work but I am probably in the minority. I don't know if a stuck or faulty EBPV could cause a rough idle or not. Seems like the engine should run fine and just experience a loss of power if anything...

 

Well I disconnected the sensor no change,swap it with my other truck no change. So I dont think my sensor is the problem.

I did a KOER test and yes the valve closes and open.

So my code P0476 is from the EBPV solenoid? If its moving the solenoid is working,then what is causing that code?

I think my rough idle is a different problem. The only other thing I did is change my oil. Maybe I should start a different tread?

 

Sorry to dredge up an old thread, but I'm troubleshooting a similar issue. Greg's posts are *great*, but mine seems to pass all the tests. P0476 only during KOER test (though I do get a P0107 very occasionally, and that's what caused me to run the tests.) Here's what I know:

1) Tube is clear and intact, with no leaks.
2) Sensor is brand new.
3) No known exhaust leaks. Bellowed up-pipes are new, both manifolds have been machined and reinstalled, and I put a Felpro gasket on the driver's side today, as I wasn't sure the manifold was sealing well around #8.
4) EBPV is working, and can be heard loudly during the KOER test. I've also used it with my decel tune, and it works.
5) I removed the F5 chip today, just to minimize the number of variables. While that did allow it to pass the KOEO test (it failed with a ROM error with the F5 installed), it made no difference in the KOER test.
6) Exhaust Back Pressure reads roughly 12.0 with the engine off, which matches the Manifold Absolute pressure. EBP goes up a little to 14 and change at idle, and goes higher than that if I rev it some. (The truck is off the ground right now, so I haven't driven it with the new sensor. Also, I live at 5300+ feet, so my absolute pressures will be a little lower than "normal".)

What else would cause a P0476 during KOER? Is this code even worth worrying about, if I never see it "in the wild"?

Thanks!

Mark

 

Anyone?

Mark

 

In case anyone is looking...

My EBP at idle is around 14 - 14.5.
At 2000 - 2500 RPM (in park - not driving down the road) it is around 18.

I read up in the thread that the pressure should be 30 - 40 or even 50 at WOT.

I'll soon go back and test while driving, but do my numbers above sound right?