exhaust pressure control valve?? - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-01-2009, 09:58 PM   #1 (permalink)
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exhaust pressure control valve??

I had my nephew pull the codes on my truck today(99 7.3) the check engine soon light flickered several times pulling a mountain with a loaded trailer(about 4k pds.)
He's not a diesel mechanic so after I got the codes I'm on my own

Code PO476

exhaust pressure control valve performance
possible causes

stuck or damaged linkage
misadjusted linkage
restricted exhaust
exhaust pressure regulater valve(epr)
damaged pcm

What/where is the exhaust pressure control valve(we think it's the waste gate) what/where is the EPRV we think that is the sensor the tube from the exhaust manifold runs up to behind the HPOP.

As a side note: a coworker has a 01 7.3 with a programmer on it, in the owners manual it says the check engine soon light may flash under heavy loads. I called Schip to see if they had a similar warning said they didn't. Anybody else had or heard of this?
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Old 11-01-2009, 10:32 PM   #2 (permalink)
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The Exhaust Pressure Control Valve (also known as the Exhaust Back Pressure Valve or EBPV) is located on the turbo outlet where the downpipe to the exhaust connects. It's NOT the wastegate.

The valve is controlled by a sensor that's mounted in front of the engine near the heater hose coming off the water pump. The sensor is connected by a tube to the front of the passenger side exhaust manifold. The sensor sends a signal to the PCM which electrically modulates a solenoid valve on the front of the turbo pedestal to send oil into the piston actuator to move the EBPV.

A common problem is the tube between the exhaust manifold and the sensor plugs with soot, so the sensor can't accurately sense the pressure in the exhaust. Cleaning that out may the problem fairly quickly unless the sensor is bad.

Here's a couple of pics.


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Old 11-01-2009, 10:44 PM   #3 (permalink)
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I cleaned that recently, I believe it was after the light flickering though, it really wasn't dirty also cleaned the sensor. I haven't been to the mountains lately, but will be going at the end of Nov. will give it a test then i suppose. It's interesting I didn't get a light going out and was loaded heavier than on the return trip when i got the light. I do recall thinking the truck wasn't pulling as well on the return trip. Would the sensor going bad affect towing performace? thanks for the reply
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Old 11-01-2009, 11:13 PM   #4 (permalink)
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It's probably not your EBPV system that's causing the check engine light, as the system is "locked out" if the Engine oil is at normal temps (about 10 minutes after starting), but I don't know why you didn't get any other codes. Possibly the scan tool isn't PSD capable.
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Old 11-02-2009, 02:22 PM   #5 (permalink)
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My nephew is a tech at the local Ford dealer, he brought the scanner and laptop that he uses at work home. Said the PO476 was a hard code(whatever that means) it also showed:

PO113 Airtemp Circuit High Input
Causes:

Open Circuit
Signal shorted to Vbatt or Vref
Sensor previously disconnected

I thought this was probably related to me installing a cold air intake, but I know just enough to be dangerous.
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