It is a valve , usually in a valve cover with a hose going into the intake manifold. It vents crank case blowby into the intake to burn it instead of dumping it into the atmosphere. If the check valve gets stuck closed, pressure builds up and make a leak. Sorry. I hate acronyms, and then I use one.
EGR= Exhaust Gas Recirculation
I wrote EGR when I ment Crank Case Vent valve.
It is a valve , usually in a valve cover with a hose going into the intake manifold. It vents crank case blowby into the intake to burn it instead of dumping it into the atmosphere. If the check valve gets stuck closed, pressure builds up and make a leak.
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if your referring to increased oil pressure-check for a clogged or defective pcv valve--- if good and vehicle is not running well possible damage to one or more piston /piston rings or head gasket need to do a compression test-
It's P0171 & P0174 not Pc 171 & Pc174 ! The engine computer has detected a lean condition ! That mean's it's not getting enough fuel or has a vacuum leak , bad O2 sensor ! fuel pump getting weak . fuel pressure regulator weak !
P0171 - System to Lean (Bank 1)
The Adaptive Fuel Strategy continuously monitors fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information.
Air Measurement System
EVAP canister purge valve leaking (when canister is "clean").
Fuel supply line restricted.
Fuel rail pressure sensor (incorrect reading).
Air Induction System
Air leaks after the MAF.
Vacuum Leaks.
PCV system (leak, valve stuck open, etc.)
Improperly seated engine oil dipstick.
Exhaust System
Exhaust leaks before or near the HO2Ss (exhaust manifold gasket, mating gaskets, etc.).
EGR System
EGR valve tube/gasket leak
EVR solenoid vacuum leak
Secondary Air Injection
Damaged/malfunctioning secondary air injection system (mechanically stuck valve).
P0174 - System to Lean (Bank 2)
The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit. Refer to Section 1 , Powertrain Control Software, Fuel Trim for more information.
See Possible Causes for DTC P0171.
See Diagnostic Aides for DTC P0171
View Freeze Frame Data to determine operating conditions when DTC was set. Observe LONGFT1 and 2 PID(s). Refer to Section 2 , Adaptive Fuel DTCs Diagnostic Techniques for more information.
This code is refer for the governor pressure sensor which is located in the valve body of the transmission. If getting power to the sensor and the wires are not open or shorted then the sensor will need to be replaced.
GOVERNOR SOLENOID AND PRESSURE SENSOR REMOVAL
Hoist and support vehicle on safety stands. Remove transmission fluid pan and filter. Disengage wire connectors from pressure sensor and solenoid (see picture) Remove screws holding pressure solenoid retainer to governor body. Separate solenoid retainer from governor (see picture) Pull solenoid from governor body Pull pressure sensor from governor body. Remove bolts holding governor body to valve body. Separate governor body from valve body Remove governor body gasket.
INSTALLATION Before installing the pressure sensor and solenoid in the governor body, replace O-ring seals, clean the gasket surfaces and replace gasket.
Place gasket in position on back of governor body Place governor body in position on valve body. Install bolts to hold governor body to valve body. Lubricate O-ring on pressure sensor with transmission fluid. Align pressure sensor to bore in governor body. Push pressure sensor into governor body. Lubricate O-ring, on pressure solenoid, with transmission fluid. Align pressure solenoid to bore in governor body Push solenoid into governor body. Place solenoid retainer in position on governor Install screws to hold pressure solenoid retainer to governor body. Engage wire connectors into pressure sensor and solenoid Install transmission fluid pan and (new) filter. Lower vehicle and road test to verify repair.
1. Confirm the Vacuum Cut Valve is installed correctly
NOTE :
^ The Vacuum Cut Valve will not work correctly and a DTC will be stored if it is installed upside-down.
^ The Vacuum Cut Valve is a white plastic valve near the fuel tank and EVAP canister.
2. Connect CONSULT-II and turn the ignition key to "N" (do not start the engine).
3. On CONSULT II, select ENGINE - DATA MONITOR - SELECTION FROM MENU - EVAP SYSTEM PRESSURE SENSOR.
4. Note the EVAP System Pressure Sensor Voltage Confirm that it is
reading in a normal range for a key ON arid engine OFF condition.
NOTE :For 2001 models and earlier:
^ Voltage in step 4 should be near 3.36 volts.
^ The normal range is between 3.32 - 3.40 volts.
For 2002 models:
^ Some 2002 models use a new type EVAP System Pressure Sensor with different operational characteristics.
^ Refer to the EC section of the appropriate Service Manual to determine which type sensor your vehicle is equipped with.
^ Models that use the new type EVAP System Pressure Sensor will have a
voltage reading that varies with changes in the "barometric" pressure
(atmospheric air pressure that changes with altitude and/or weather
conditions).
^ The usual voltage range obtained in step 4 with the new type EVAP
System Pressure Sensor is between 3.8 and 4.2 volts. Because this range
will vary with barometric pressure, it is best to compare readings with a
known good vehicle.
^ Some 2002 models use the earlier type EVAP System Pressure Sensor
(same as used on 2001 and earlier models). The normal range for the
earlier type is 3.32 to 3.40 volts and does not vary with barometric
pressure.
5. Start the engine. Observe the EVAP System Pressure Sensor voltage.
^ If the value has reduced 0.04 volts or more from the reading obtained
in step 4, the EVAP Canister Purge Volume Control Solenoid Valve may be
leaking.
^ Refer to the EC section of the appropriate Service Manual for
inspection procedures of the EVAP Canister Purge Volume Control Solenoid
Valve, DTC P1444.
NOTE :The EVAP Canister Purge Volume Control Solenoid Valve is located in the engine compartment.
6. Perform the DTC Confirmation Procedure for DTC P1491. Refer to the EC
section of the appropriate Service Manual for confirmation procedure
steps and driving conditions.
7. If the DTC confirmation results are NG, do the following:
a. Refer to the EC section of the appropriate Service Manual to
determine if the vehicle is equipped with On-Board Refueling Vapor
Recovery (ORVR).
^ If the vehicle has ORVR, go to b.
^ If the vehicle does NOT have ORVR, go to step 8.
b. Place a clamp on the Refueling EVAP Vapor Line near the fuel tank.
The Refueling EVAP Vapor Line is the larger hose (see figure 2). Use
hose clamp (3M P/N # 08556-1), found in Fuel Injector Cleaning Kit
J-45701, or equivalent.
c. Retry DTC Confirmation Procedure
d. If the result is now OK, the Refueling Control Valve may be leaking
and should be inspected. Refer to the EC section of the appropriate
Service Manual for Refueling Control Valve inspection procedures.
8. If the DTC confirmation is still NG after step 7, or the vehicle is not equipped with ORVR, do the following:
a. Disconnect two (2) lines from the Vacuum Cut Valve. One that goes to
the fuel tank and one that goes to the EVAP Canister (see figure 1).
b. Use a hand vacuum pump to check each of the two (2) disconnected
hoses for free flow. Make sure they are clear into the fuel tank (vent
line) and into the EVAP Canister (see figure 2).
NOTE :
^ Figure 2 includes ORVR system. Refer to the appropriate service manual to determine if your vehicle has ORVR or not.
^ The lines between the Vacuum Cut Valve and Fuel Tank, and between the
Vacuum Cut Valve and EVAP Canister may go through a metal line. Make
sure the lines are clear between the Vacuum Cut Valve and Fuel Tank, and
between the Vacuum Cut Valve and EVAP Canister, including any metal
lines.
c. If any blockage is found, determine the cause and repair as necessary. Blockage in either of these lines will cause a DTC.
9. If all of the above checks do not locate the source of the incident,
refer to the appropriate Service Manual for further DTC P1491 diagnosis.
Well there is the intake. And if your running your car with a bad PCV valve you will have pressure building up and oil will spray making it look like its coming from somewhere else rather than the Valve covers. I would replace the PCV valve first and power wash the engine and replace the valve cover gaskets. Please leave a good feedback on here for me.
It's a vacuum reference - the valve needs manifold pressure to keep the diaphragm closed when you're boosting, and that pressure opens the valve when you get off the gas. Use a T and tap into a vacuum line either from the manifold or from the wastegate reference line and it'll work.
There should be some bolts surrounding the valve cover(s). Take them out take the valve cover off clean it up good put new gasket on put bolts back in tighten from center out so valve cover don't warp
Brilliant, all makes sense and now clear thanks to you
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