Exhaust pressure control valve a stuck open

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Attached are some pictures of the EPG shutter on a Volvo D12 engine. Just want to know if that shutter is stuck partially closed, and does not retract all the way back when there is no pressure form the AVU. To me it looks like it is not fully open and thus restricts exhaust gasses form escaping freely. Apr 25, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat Jul 30, 2012 · A helpful F chatter showed me the way. We followed the method and I can turn valves on and off at will. Takes several hours but great option. Best Pull entire rear diffuser, wheel splash guards and wheels to get to factory exhaust bypass valves Locate Two wire actuators for the exhaust Cut one wire on each solenoid Run 4 wires into cabin Jul 30, 2012 · A helpful F chatter showed me the way. We followed the method and I can turn valves on and off at will. Takes several hours but great option. Best Pull entire rear diffuser, wheel splash guards and wheels to get to factory exhaust bypass valves Locate Two wire actuators for the exhaust Cut one wire on each solenoid Run 4 wires into cabin Jun 01, 2003 · This way even though the reheater is at a high pressure, the HP turbine exhaust pressure is low (at around the condenser pressure). The drawback of the start-up bypass is added capital cost. HP ... How to free a stuck valve without removing cylinder head. How to free a stuck valve without removing cylinder head. P047F Exhaust Pressure Control Valve "A" Stuck Open P0477 Exhaust Pressure Control Valve "A" Low P048A Exhaust Pressure Control Valve "A" Stuck Closed P048B. May 05, 2018 · Sounds like maybe the exhaust valve guides were too tight and the valves started sticking when they heated up. Di you have the timing set properly ? Retarded timing will make the exhaust valves run very hot. Either way your next step should be calling the place that built the engine and ask them how to proceed. P0475 Exhaust pressure control valve malfunction Causes: Open/grounded ckt., solenoid open/shorted, failed PCM P0476 Exhaust pressure control valve performance Causes: Failed/stuck EPR control, EBP fault, EPR circuit P0478 Exhaust pressure control valve high input Causes: Plugged sensor line, stuck butterfly, restricted exhaust If the valve sticks in the closed position, the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can't open to allow recirculation. If the pressure washer doesn't develop adequate outlet pressure, the unloader valve could be stuck open. Sep 07, 2012 · 001151 - Exhaust Pressure Control Valve P047F - 000 - Stuck Open - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 2 Fault Frequency: 2 Mileage: 81327 km Time Indication: 0 Date: 2023.14.05 Time: 13:46:51 Freeze Frame: RPM: 1955 /min Speed: 32.0 km/h Load: 42.7 % Load: 39.6 % Lambda: 99.4 % Temperature: 42.0°C Jun 06, 2020 · Hi all, I recently had a Borla Atak installed on my C7 Z51 now throws a check engine light, I plugged my computer and it says actuator (AFM) valves stuck open I reset the code and worked good for about 2 hours, I shut the car off and restarted it the check engine light came on again Has... Apr 25, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat P048A – Exhaust Pressure Control Valve “A” Stuck Closed. By BAT Team Last Updated 2016-07-29 A site with free advice from mechanics. Trouble Code Hit the valve with a brass hammer, gently, trying to close it -- exhaust valves always stick in the open position. This works well, but slowly. It could take days, maybe a week or longer. Keep soaking, tapping, and hitting until the valve breaks loose. Mar 22, 2011 · Initially the MAF requested matched the Actual and the Engine load seemed responsible. Roughly 30 seconds after I started the car the Engine load got pegged at 100% and the MAF actually tracked at roughly double the requested value. This seems like it is probably related to the exhaust pressure control valve being stuck open. Apr 25, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat If the valve sticks in the closed position, the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can't open to allow recirculation. If the pressure washer doesn't develop adequate outlet pressure, the unloader valve could be stuck open. Sep 07, 2012 · 001151 - Exhaust Pressure Control Valve P047F - 000 - Stuck Open - Intermittent Freeze Frame: Fault Status: 00100000 Fault Priority: 2 Fault Frequency: 2 Mileage: 81327 km Time Indication: 0 Date: 2023.14.05 Time: 13:46:51 Freeze Frame: RPM: 1955 /min Speed: 32.0 km/h Load: 42.7 % Load: 39.6 % Lambda: 99.4 % Temperature: 42.0°C If the valve itself is physically stuck, that's not a big deal. But if a vacuum line has come undone, the vacuum leak is a problem that needs attention. (The valves are open if no vacuum is applied to them. This is why the car is noisy at startup, until vacuum builds to overcome the spring pressure on the valves and close them.). Apr 24, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Pressure Control Valve "B" Stuck Open. The Exhaust Pressure Control Valve controls exhaust back pressure during engine warmup. If the engine control module (PCM) determines there is an incorrect signal from the Exhaust Pressure Control Valve, the PCM will set code P04A4. P047F Exhaust Pressure Control Valve "A" Stuck Open P0477 Exhaust Pressure Control Valve "A" Low P048A Exhaust Pressure Control Valve "A" Stuck Closed P048B. Aug 23, 2017 · If the valve is stuck open, you may only notice it on cold days when your truck takes a little longer to warm up. But if the valve is stuck closed, your truck will be down on power and it will feel like there is an engine brake applied. Excessive back pressure like this can force the exhaust valves to float open, potentially striking the ... Attached are some pictures of the EPG shutter on a Volvo D12 engine. Just want to know if that shutter is stuck partially closed, and does not retract all the way back when there is no pressure form the AVU. To me it looks like it is not fully open and thus restricts exhaust gasses form escaping freely. Apr 24, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat And every one of the are 4-valve per cylinder engines. So the V6 has 12 valves stuck open? All on the same cam. If the timing belt broke, and the V6 in '03 does have a belt, they would be frozen in position with some open some closed and maybe some in between..but all of them stuck open> Something doesn't sound right Only to get the P047f code exhaust pressure control valve stuck open. This extended warranty code is for " Certain 2009-2012 VW TDI vehicles engine codes CBEA, CJAA, and CKRA. My car has a bit over 45,000 miles on the odometer and have had since new about a year and a half. In this case, the valve appears to be stuck in the open position. Exhaust pressure (also called back pressure) regulators are used in turbocharged gasoline and diesel engines. Exhaust back pressure control valve operation is often similar to that of the throttle body. Feb 03, 2013 · winter 10-20% decrease would be expected because of winterized fuel belnd, long warmup, diff. ambient conditions, etc. half is a bit extreme but if car is not running right it still sounds bad. Apr 25, 2017 · Learn what Exhaust Pressure Control Valve 'A' Stuck Open means, location and how to repair? Exhaust Back Pressure Regulator - Is a variable position valve that controls exhaust back pressure during cold ambient temperatures to increase cab heat On the other hand, if the camshaft keeps the valves open for longer periods of time, as with a racing cam, problems start to occur at the lower engine speeds. Opening the intake valve while the exhaust valve is still open may cause unburnt fuel to exit the engine, leading to lower engine performance and increased emissions. Nov 28, 2009 · I continued with Marvel for a couple more weeks, but no luck. March 31 I pulled the head. Intake valves on #1 and #4 were open. Exhaust valves on #3 and #6 were open. I started alternating between three kinds of lubricant on the valves: Marvel Mystery Oil, ATF/Acetone mixture, and WD-40. I took a rubber mallet and tried to bang the open valves down