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01 BMW 325ci has code 491 492 replaced air pump intake manifold check valve vacuum line still have code can some one tell me what I am missing

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Posted on Jan 02, 2017

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chadha1usa
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Did you check the Vacuum lines to the Secondary air Valve Controls. They may be rotten. Can you do a Smoke test. Replace dry rotted lines with either 3/16 Fuel or Power Steering Hoses if you do not get ORM Vacuum lines/hoses. There are many Vedios on You Tube showing this specific problem solving on German cars. you can check out these,
Secondary Air Injection Systems on German Vehicles E39) 2001 BMW 525i Resolve P0491/P0492 for less than $2.00 in approx 15min. How to Fix and Diagnose BMW P0491 P0492 Secondary Air / Vacuum Leak E36 E46 E39 E53

I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

Posted on Aug 28, 2017

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Have a 01 bmw 325ci had code 0491 and 0492 secondary air insufficient i changed the check valve control switch vacum lines water pump 02 sensors up stream thermostat still get the codes can any one tell me...


Did you check the Vacuum lines to the Secondary air Valve Controls. They may be rotten. Can you do a Smoke test. Replace dry rotted lines with either 3/16 Fuel or Power Steering Hoses if you do not get ORM Vacuum lines/hoses. There are many Vedios on You Tube showing this specific problem solving on German cars. you can check out these,
Secondary Air Injection Systems on German Vehicles E39) 2001 BMW 525i Resolve P0491/P0492 for less than $2.00 in approx 15min. How to Fix and Diagnose BMW P0491 P0492 Secondary Air / Vacuum Leak E36 E46 E39 E53

I’m happy to assist further over the phone at https://www.6ya.com/expert/uttamjeet_2f3adc18600f8ede

Aug 28, 2017 | BMW Cars & Trucks

3 Answers

OBD test - Emissions test


hi ecudave, i will go for a tune-up / clean up; the injection system, intake and replacing the sparks, regular maintenance like this will surely clean you emmision. as per re[air cost or shop costs, that will still depend on which part to clean or to work on or even to replace like the spark, but it will not be more than $400.

hope that helps

Aug 05, 2008 | 1998 Audi A6

1 Answer

72 bug, did some more research....


Yeah, about ten times better. Look, you need vacuum in the intake manifold, you have to have it or air wouldn't rush in from the air cleaner, the engine would not breathe, and it would sit there and barely run, or not run at all.
By design, vacuum is created when the piston in a cylinder is pulled down by the crankshaft and the intake valve is open. So air from the intake moves into the cylinder, leaving a vacuum (lower air pressure) in the intake manifold. For more air to be drawn in, but it's a set amount of air. Vacuum leaks and leaking intake manifold gaskets pull in extra air and lean out the air/fuel mixture too much. So plug off that hole and make sure no vacuum leaks.
For your '72, an inexpensive vacuum gauge would be a wise investment. Check this site for its usefulness:
http://www.secondchancegarage.com/public/186.cfm

All engines run with a vacuum in the intake, a good engine should have a steady vacuum of between17 and 21 inches on the gauge at idle. The tighter and less worn the engine is, the vacuum will be higher, like 21 inches Hg. But should be at least 16 or 17, and steady. Learn how to use a vacuum gauge and you can tell a lot about the engine's condition-just check the site.

Nov 15, 2013 | Cars & Trucks

1 Answer

Where does the elctric air pump hose go and the two vaccum lines go


The electric air pump has two lines intake air and exhaust air the exhaust air goes to a diverter valve on some models then travels to metal tube and separates to the air check valves on the injection tubes to the exhaust manifolds. the diverter valve has the vacuum line on it which goes to the electric switching valve and then to manifold vacuum.

Nov 08, 2013 | 1999 Oldsmobile Bravada

1 Answer

PO411 WHAT DOES THIS MEAN


Step 1:


What does tP0411 Secondary Air Injection System Incorrect Flow DetectedWhat does that mean? Secondary Air Injection is an emission control that uses an air pump (either electric or turned by the drive belt) to move fresh air into the exhausticon1.png manifold(s) or exhaust ports when the engine is in open loop and pre-catalytic converter when in closed loop. This reduces hydrocarbon emissions (HC), Carbon Monoxide (CO), and oxides of Nitrogen (NOx). This fresh air helps convert Carbon Monoxide (CO) into Carbon Dioxide (CO2) and Hydrocarbons (HC) into water vapor (H20).
A check valve is located in the air supply line to keep exhaust gasses from flowing into the pump. A cutoff valve that controls the airflow may be vacuum controlled or electrically controlled. When the powertrain control module (PCM) activates the valve, vacuum travels to the cutoff valve to open it and allow fresh air to flow. Some systems may have only a check valve and the flow may be regulated by a electromagnetic clutch on the air pump (similar to an A/C clutch).
Under hard acceleration, the air pump will be deactivated to prevent backfiring in the exhaust. To self-check, the AIR system will be activated by the PCM and fresh air would be routed into the exhaust system. The oxygen sensors would sense this fresh air as a lean condition and the short term fuelicon1.png trims would begin to move in the positive direction to compensate. The PCM expects to see this happen within just a few seconds during the self test. If it does not see the short term fuel trims rise, then the PCM interprets this as a malfunction in the AIR system and a code will be recorded.

Step 2:

Symptoms Symptoms of a P0411 DTC may include:
  • MIL (Malfunction Indicator Lamp) illumination
  • Backfiring in the exhaust under hard acceleration
  • Engineicon1.png running rich (This is counter-intuitive. See explanation below)
  • Squealing belt
Causes Potential causes of a P0411 code include:
  • Damaged or missing check valve
  • AIR pump intake port plugged/damaged
  • AIR pump clutch malfunction
  • Holes or damage to exhaust components

Step 3:

Possible Solutions If you have access to a scan tool, with KOEO (Key on engine off) command the AIR pump on. It should activate. If it doesn't, remove and inspect the AIR pump relay for discoloration/melting due to heat. Repair as necessary.
With the ignition on (engine off) check for battery voltage at the switched battery feed to the relay and the relay control circuit. If either of these isn't present, inspect circuit for blown fuse or open/short in the wiring. Repair cause of short and retest. If they are both present, jumper the battery feed to AIR pump feed circuit using a fused jumper. The pump should activate. If not, check for powericon1.png and ground present at the AIR pump when jumpered. If there is no voltage/ground present at pump repair open in wiring harness. If voltage and ground is present, but pump still does not run, suspect a bad AIR pump. If after jumpering the AIR pump feed circuit the pump activates then the problem is likely the AIR pump relay. Replace and retest.
If the scan tool activates the AIR pump, with KOER (Key on engine running) activate the AIR pump solenoid valve on and see if there is vacuum to the cutoff valve. It should have vacuum present to open the valve. If there is no vacuum present, check the AIR pump's vacuum solenoid valve for vacuum supply from the manifold. If there is vacuum present then the vacuum solenoid is likely bad. Replace it. If there is no vacuum present at the supply to the vacuum solenoid, check for a plugged or damaged vacuum line or plugged vacuum port. But if there is vacuum present at the cut-off valve, shut the engine off and using a vacuum pump, apply vacuum to the cut-off valve and see if it holds a vacuum and that air flows through it when vacuum is applied. If it doesn't hold vacuum or the valve doesn't flow when vacuum is applied, replace the cut-off valve. If the cut-off valve works properly, inspect the check valve for obstruction or to see if it's missing. Replace as necessary.
Check the steel line to the exhaust catalyst as well as the exhaust ports for damage or holes that could give a false reading.

Feb 19, 2013 | 2007 Buick LaCrosse CXL Sedan

2 Answers

Obd code p0457 fuel cap replaced mil reset defect not cleared connection checked ok


The code is for a large leak in the EVAP system such as a loose or missing gas cap. But it could also mean a loose or missing hose to the canister or other leak in the tank.
The computer vents the tank several times an hour while the engine is running, and it checks the system by pressurizing the gas tank. If the tank will not hold pressure the code is set.
You may have to check the top of the tank where the fuel pump gasket is, as well as the vent lines to the front of the car.
A mechanic would perform a smoke test to look for leaks.

Jul 23, 2012 | Honda Accord Cars & Trucks

1 Answer

How to replace head gasket on 4 cylander


2.6L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Drain the cooling system.
  3. Relieve the fuel system pressure.
  4. Remove or disconnect the following:
    • Negative battery cable
    • Hood
    • Accessory drive belts
    • Accelerator cable
    • Positive Crankcase Ventilation (PCV) valve and hose
    • Air intake duct
    • Fuel pressure regulator vacuum line
    • Canister hose
    • Brake booster vacuum line
    • Engine wiring harness connectors at right wheel housing
    • Ground cable connector at the intake manifold, starter and firewall
    • Heated Oxygen (HO2S) sensor connector
    • Alternator wiring connectors
    • Oil pressure switch connector
    • Starter motor harness connectors
    • Ignition coil connector
    • Spark plug wires
    • Distributor
    • Exhaust front pipe
    • Exhaust Gas Recirculation (EGR) gas temperature sensor connector
    • Air pump
    • EGR pipe
    • Heat shield
    • Exhaust manifold
    • Throttle Position (TP) switch connector
    • Cooling fan
    • Water pump pulley
    • Power steering pump
    • Intake manifold
    • Crankshaft pulley
    • Front cover
    • Timing belt. Refer to the Timing Belt unit repair section.
    • Valve cover
    • Rocker arms
    • Camshaft
    • Cylinder head
Cylinder head bolt loosening sequence - 2.6L engine

tecnovative_96.gif
  1. To install:
  2. NOTE: Refer to Section 1 of this manual for the cylinder head torque sequence illustration. The illustration is located after the Torque Specification Chart.
  3. NOTE: Lubricate the cylinder head bolts with clean engine oil for assembly.
  4. Install the cylinder head with a new gasket. Tighten the bolts in sequence as follows:
  5. Step 1: 58 ft. lbs. (75 Nm)
  6. Step 2: 72 ft. lbs. (98 Nm)
    1. Install or connect the following:
    2. Camshaft
    • Rocker arms
    • Valve cover
    • Timing belt
    • Front cover
    • Crankshaft pulley. Tighten the bolt to 87 ft. lbs. (128 Nm).
    • Intake manifold
    • Power steering pump
    • Water pump pulley
    • Cooling fan
    • TP switch connector
    • Exhaust manifold
    • Heat shield
    • EGR pipe
    • Air pump
    • EGR gas temperature sensor connector
    • Exhaust front pipe
    • Distributor
    • Spark plug wires
    • Ignition coil connector
    • Starter motor harness connectors
    • Oil pressure switch connector
    • Alternator wiring connectors
    • HO2S sensor connector
    • Ground cable connector at the intake manifold, starter and firewall
    • Engine wiring harness connectors at right wheel housing
    • Brake booster vacuum line
    • Canister hose
    • Fuel pressure regulator vacuum line
    • Air intake duct
    • PCV valve and hose
    • Accelerator cable
    • Accessory drive belts
    • Hood
    • Negative battery cable
    1. Fill the cooling system.
    2. Start the engine and check for leaks.

    tecnovative_65.jpg

    Feb 05, 2011 | 1997 Isuzu Rodeo

    1 Answer

    1998 saturn st wagon . engine code 0449


    Computer is not getting current through the purge valve/solenoid. Check connection to valve. If good, you can either test the valve to see if it's bad (requires special equipment) or just replace the valve. Instructions for both are pasted below. The cost of the part is $40. Let me know if you have more questions.


    COMPONENT TESTING Carefully check for cracks or leaks in the vacuum lines or in the canister itself. The lines and fittings can be reached without removing the canister. Cracks or leaks in the system may cause poor idle, stalling, poor driveability, fuel loss or a fuel vapor odor.
    Vapor odor and fuel loss may also be caused by: fuel leaking from the lines, tank or injectors, loose, disconnected or kinked lines, or an improperly seated air cleaner and gasket.
    If the system passes the visual inspection and a problem is still suspected, proceed as follows:

    1. With the ignition switch in the OFF position, unplug the electrical connector from the canister purge solenoid. Use an ohmmeter to check the solenoid coil resistance; it should be 19-31 ohms.
    2. Turn the ignition switch ON then, disconnect the vacuum line from the intake manifold and connect a hand vacuum pump to the valve.
    3. Apply a vacuum of about 10 in. Hg (34 kPa) to the hose and solenoid, then observe if the valve holds the vacuum. If the valve does not hold, apply vacuum directly to the solenoid to determine if the solenoid or hose is at fault, then replace the component which allowed vacuum to release.
    4. If the vacuum holds in the initial test, jumper the test terminals on the ALDL (terminals A and B are the test terminals and are the two uppermost right terminals of the ALDL connector), and observe if the valve activates, releasing the vacuum. If the valve does not activate and release the vacuum, replace the solenoid.


    REMOVAL & INSTALLATION
    Canister Purge Solenoid Valve
    See Figure 2
    The purge solenoid valve is mounted on the engine, towards the rear and below the intake manifold.

    1. As an added safety precaution, you may wish to disable the air bag(s), if equipped. refer to Chassis Electrical for the air bag disabling procedure.
    2. Disconnect the negative battery cable.
    3. Remove the air cleaner/intake tube assembly.
    For DOHC engines, the solenoid can be reached through the access hole located next to the intake manifold support bracket.
    1. Unplug the solenoid vacuum hoses and electrical connector.
    2. Remove the attaching bolt, then remove the canister purge solenoid.

    To install:
    1. Install the solenoid and tighten the retaining bolt to 19 ft. lbs. (25 Nm).
    2. Connect the vacuum lines to the solenoid, then install and push in the electrical connector until it clicks firmly into place.
    3. Install the air cleaner/intake tube assembly.
    4. Connect the negative battery cable.
    5. If necessary, enable the air bag(s). refer to Chassis Electrical .

    Fig. Fig. 2: The canister purge solenoid is mounted below the intake manifold cfd22db.gif

    Oct 28, 2010 | 1998 Saturn SL

    2 Answers

    Car runs rough during initial startup!


    Check the fuel filter,or just change it,it is more likely it is stopped up.

    Jun 07, 2010 | 2004 BMW 3 Series

    2 Answers

    I have bmw 2004 525i and code came out po411 what is that and how to fix it.


    Secondary Air Injection Incorrect Upstream Flow Detected.
    Check to see if there are any broken or cracked hoses going to the intake manifold.
    A faulty air pump / smog pump would cause this too.

    May 16, 2010 | BMW 525 Cars & Trucks

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