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Install a tachometer on the engine, following the manufacturer's instructions.
Detach the engine wiring harness connector from the Idle Air Control (IAC) solenoid.
Disconnect and plug the vacuum supply hose from the EGR valve.
Start the engine, then apply the parking brake, block the rear wheels and position the transmission in Neutral.
Observe and note the idle speed.
If the engine will not idle with the IAC solenoid disconnected, provide an air bypass to the engine by slightly opening the throttle plate or by creating an intake vacuum leak. Do not allow the idle speed to exceed typical idle rpm. Using a hand-held vacuum pump, slowly apply 5-10 in. Hg (17-34 kPa) of vacuum to the EGR valve nipple.
If the idle speed drops more than 100 rpm with the vacuum applied and returns to normal after the vacuum is removed, the EGR valve is OK.
If the idle speed does not drop more than 100 rpm with the vacuum applied and return to normal after the vacuum is removed, inspect the EGR valve for a blockage; clean it if a blockage is found. Replace the EGR valve if no blockage is found, or if cleaning the valve does not remedy the malfunction.
Hi, when code P1406 appears, the Exhaust Gas Recirculation (EGR) valve has failed. Cleaning the EGR valve can sometimes clear the code. It's best to clean the valve before replacing the entire unit.
Park the GM and allow the vehicle ample time to cool off, up to a half hour.
Open the hood of the vehicle and locate the EGR valve. You can find the EGR on GM models on the intake manifold. Location may vary slightly from model to model, so it's best to refer to your repair manual. The valve looks like a mushroom top component with a hose and electrical connector coming off it.
Pull the vacuum hose gently from the valve to remove it. Squeeze the sides of the electrical connector and pull the connector straight off. Place both components to the side to ensure they do not get damaged during the removal process.
Use a socket wrench to loosen and remove the two bolts securing the valve to the mount. Turn the wrench counterclockwise until you remove both bolts. You can now remove the loose valve. Lift the valve straight off the mount using some force.
Place the EGR valve in a small bowl with about an inch of carburetor cleaner. Make sure only the bottom part of the valve is soaked. Leave the valve overnight to allow the cleaner to penetrate the carbon.
Use a wire brush, small pick and a rag to clean the valve. Push open the valve and clean any carbon debris or build up. The valve should now move freely. Allow the valve to air dry completely.
Reinstall the valve. Align the valve on the mount so the holes on the valve match the holes on the mount. Insert the two bolts and tighten using the socket wrench. Plug the vacuum hose back into the valve. Reconnect the electrical connector, then push it into place until you hear it click secured. Close the hood of the GM vehicle.
Disconnect the car battery. Locate the EGR valve. You may need to refer to the owner's manual.
Unhook the air supply hose, vacuum hose and all electrical connections. You may need the screwdriver for this.
Remove the EGR mounting bolts with the socket wrench.
Unbolt the EGR valve from the EGR tube with the wrench. Use a wide-mouthed wrench, which works best for this.
Look at the EGR valve. If there are holes in the valve, it
definitely needs to be replaced. If there are no holes, you may opt to
clean it by spraying a half can of carburetor cleaner into the valve.
Let it sit, then use a gasket scraper, putty knife, small drill bit or
long wood screw to scrape out the buildup in the valve.
Install a new gasket and EGR valve if a total replacement is
due. Attach all hoses, wiring and bolts that were previously removed.
What you're describing can be caused by any number of things. However, sometimes, on that generation of Camry, a similar problem is caused by a malfunction in the EGR valve. If the EGR valve opens when it shouldn't, or if it stays open when it should close, it will kill the engine. You can try disconnecting the vacuum hose that actuates the EGR. (Plug the hose so junk doesn't get sucked in). This will disable the EGR from opening. Or, you can disconnect the EGR Vacuum Switching Valve from its electrical harness. This will also inhibit the EGR. If either one of these two "fixes" prevents the problem from happening again, you'll know that it's an issue with the EGR valve.
Chrysler Concorde 1993-1997 3.5L MFI 6cyl Exhaust Gas Recirculation System Operation This system reduces the amount of oxides of nitrogen (NO
) in the exhaust by allowing a predetermined amount of exhaust gases to
recirculate and dilute the incoming fuel/air mixture. The diluted
air/fuel mixture reduces peak flame temperature during combustion,
which in turn inhibits the production of Nitrogen oxides. The principal components of the system are: - EGR tube (connects a passage in the intake manifold to the exhaust manifold) - EGR valve - Electronic EGR Transducer - Vacuum hoses
Component and System Testing
Check the condition of all of the EGR system hoses and tubes for
leaks, hardening or kinks on the rubber hoses. Repair and correct these
conditions before proceeding any testing.
Be sure that the hoses at both of the EGR valve and EGR valve control are connected to the proper fittings.
Be sure the electrical connector is firmly attached at the valve control.
To check the EGR system operation, connect the DRB III scan tool
or equivalent to the 16-way data link connector. The data link
connector is located on the lower edge of the instrument panel near the
steering column. Follow the scan tool instructions.
After checking the system with the DRB III scan tool, proceed to the EGR valve leak and control tests, then repair as necessary.
Removal & Installation EGR Valve and Transducer
EGR valve and transducer assembly-3.5 engine
The EGR valve attaches to the back of the cylinder head-3.5L engine
Loosen, but do not remove, the EGR tube to intake manifold screws
The EGR valve attaches to the rear of the right cylinder head.
Remove the vacuum tube from the electric EGR transducer solenoid.
Inspect the vacuum lines for cracking, poor seal due to hardness, or
other problems. Replace with new hoses if necessary.
Remove the electrical connector from the solenoid.
Slide the transducer up and out of the mounting bracket.
Loosen, but do not remove, the EGR tube to the intake manifold screws.
Remove the EGR tube lower screws at the valve.
Remove the EGR valve and transducer.
Clean both gasket surfaces and check for any signs of leakage or
cracks. Replace the components if any such damage is found or if the
valve fails the tests.
Loosely install the EGR valve and a new gasket onto the cylinder head.
Using a new gasket, attach the EGR tube to the valve and tighten the screws to 95 inch lbs. (11 Nm).
Tighten the EGR tube to the intake manifold plenum screws to 16 ft. lbs. (22 Nm).
Tighten the EGR valve to the cylinder head screws to 16 ft. lbs. (22 Nm).
Reconnect the transducer solenoid to the vacuum fitting on the manifold.
Slide the transducer into the bracket.
Reconnect the vacuum lines and electrical wires to the EGR transducer.
What is going on?
Exhaust Gas recirculation low flow detected means that: there is vacuum problem in the EGR system - between the combustion chamber, EGR valve (mechanical - blown up diaphragm or clogged airlets/hoses) , EGR Modulator Valve (mechanical - blown up diaphragm, dirty EG/air filter or clogged airlets/hoses) and Vacuum Switching Valve ((mechanical - blown up diaphragm or clogged airlets/hoses OR electrical - VSV not properly synchronizing with the ECM, for instance).
This causes the combustion chamber temperature to increase and produce Oxides of Nitrate (NOx) that is out of an acceptable emission range. This triggers the Malfunction Light (check engine light) to stay on (after a couple of driving cycles)!
Solution: Focus on EGR airways (hoses...) and organs (EGR valve, EGR Modulator, VSV), clean, check or replace the defected one. VSV seems to be criticale as it plays electrical & mechanical function. Once the repair is done, Clear the P0401 code using an OBII scanner.