Question about 1990 Honda Accord

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No vacuum on the egr valve

There is no vacuum on the #16 vacuum hose going to the egr valve, the hose is not clogged

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It could be diconnected on the other end

Posted on Nov 07, 2012

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96 cutlass supreme will not pass emission in ut. what should I do? KOER failed, trouble code po401


cleanout egr valve and troutle body . Or replace egr with new one, clean, check vacumm lines , check for clogged check , depending on modle of car you can pippoint problem as some have a common part problem depeding with make of car. But all have to do with exaust system. Insufficient flow exaust flow. Im not an expert, all I know it is related to this, I have it myself so im googling it.

Ford EGR valve

The OBDII fault code P0401 means that the engine computer has detected that the Exhaust Gas Recirculation (EGR) system flow is insufficient. Read more how the EGR system works below. What could cause the code P0401 - clogged or restricted EGR passages
- faulty EGR valve
- EGR valve stuck closed
- problems with the DPFE sensor (Ford)
- problems with hoses to the DPFE sensor (Ford)
- problem with the EGR vacuum switching valve (Toyota)
- clogged catalytic converter
- carboned up EGR temperature sensor
- vacuum supply issues at the vacuum-operated EGR valve
- electrical problems with the EGR valve control circuit
- engine computer problems
helpful website helps you with pinpoint and sou;ution related to auto make and model shows you most common cause of code reading.
www.samarins.com

Apr 16, 2013 | Cars & Trucks

1 Answer

I have the engine check light on my 2001 Hyundai XG 300. The codes I brought up with the OBD2 reader were P0100 P0115 P0120 P1600 What would you suggest is the problem and fix on this I also...


Welcome to FIxYa.com
Description of codes are:
P01600 - Serial cable malfunction-- check connection,
Po115-Coolant sensor-indicates a open or short-circuit in the engine coolant temperature sensor circuit.

The P0401 code is Insufficient Flow Exhaust Gas Recirculation System.

The code is set when the engien computer detects less than the requested amount of EGR flow when the engine is hot and is under load.

What usually sets the code is an inoperative EGR valve, or a carbon clogged port under the EGR valve.

On your engine, the EGR valve is vacuum operated, and there is a little computer-controlled EGR solenodi valve in the vacuum hose that detemines how much vacuum the EGR valve gets. If this solenoid is bad, or there is a vacuum leak in one of the hoses, the EGR valve won't open when it should setting the code.

Since the dealer already cleaned the EGR valve tube, I would suspect your problem is likely due to a bad EGR solenoid valve or a leaky vacuum hose to the EGR valve.


Here is the EGR solenoid valve part number and list price:

P/N 3946038750 $40.59



I would clear the codes first and run engine for two min and re-check codes.



Write to me of the findings and we will go from there.





Regards, Lee Davidian


A Four Thumbs up ^^^^ is appreciated for answering your question.

Thank you, Lee Davidian

Oct 19, 2010 | 2001 Hyundai XG300

1 Answer

Check engine code 2001 ford taurus p0401


usually caused by clogging or bad valve. Valve can fail by clogging, torn diaphram, or bad/loose vacuum actuation hose.

Exhaust gas recirculation (EGR) system - insufficient flow detected

Causes: Hose leak/blockage, basic setting not carried out (if applicable), wiring, EGR valve, EGR solenoid, ECM


Your EGR valve should be on top of the engine in the front between the intake manifold and the pulleys. It looks something like this:


382f71b.jpg
First, make sure the vacuum hose is good and run it down to where it connects to the intake manifold to check for any leaks. If that's good and you want to get your hands dirty, take the valve off and see if it's clogged. clean it and see if you can actuate it with vacuum (put a vacuum hose on it, ****, and see if it will open. Also, look to see if there is gunk in the line and intake where it connects. Clean out anything you can with carb cleaner.
If you can get it unclogged and the valve is working, put the valve back on with a new gasket, else buy a new one ($40 at autozone :o( ). If you solve the issue, the engine light should clear after a couple hours of driving. OK?

Oct 16, 2010 | 2001 Ford Taurus

1 Answer

Egr valve malfunction


To check the EGR system operation bring the Engine up to operating temperature and, with the transmission in neutral (parking brake set and tires blocked to prevent movement), allow it to idle. Open the throttle so the engine speed is between 2000 and 4000 rpm and then allow it to close. The EGR valve stem should move if the control system is working properly. The test should be repeated several times. Movement of the stem indicates the control system is functioning correctly. If the EGR valve stem does not move. Check the vacuum signal to the EGR valve. Remove the hose from the valve, place your finger over the end of the hose and perform the procedure again. If no vacuum is present at the end of the hose check the hose connections to make sure they are not leaking or clogged, then check the EGR control solenoid. also check all hoses for cracks, kinks, broken sections and proper connections. I hope this will help you.

Jun 29, 2010 | 2000 Nissan Maxima

1 Answer

How do i test egr system on 93 toyota camry


Testing steps:

  • Remove the vacuum hose on the top of the EGR valve and plug it.
  • Connect a short hose to the EGR valve.
  • Start the car.
  • Now **** on the hose, or use an appropriate tool to apply suction to the line
  • this will open the EGR valve the engine should stumble and try to die.
    If it does the EGR valve is working.
There is an "Exhaust gas manifold pressure sensor" that measures the exhaust gas flow to the EGR valve. The problem is the sensor itself becomes clogged with exhaust carbon and gives the computer a fixed false reading, the computer in turn sends too much vacuum to the EGR valve and the engine runs rough, surges and may die.

Apr 25, 2010 | 1999 Toyota Camry

1 Answer

How to install egr valve on 2000 mitsubishi mirage 1.5


  1. Disconnect the negative battery cable.
  2. Remove the air cleaner and intake hoses as required.
  3. If necessary, detach the EGR temperature sensor connector.
  4. Tag and disconnect the vacuum hose from the EGR valve.
  5. Remove the mounting bolts and the EGR valve from the engine.
  6. Clean the mating surfaces on the valve and the engine. Make sure to remove all gasket material.
  7. Inspect the valve for a sticking plunger, caused by excess carbon deposits. If such a condition exists, clean with appropriate solvent so valve seats correctly.
To install:
  1. Install EGR valve with a new gasket in place.
  2. Install the mounting bolts and tighten as follows:
  3. 1.5L, 1.6L, and 1.8L engines—7–10 ft. lbs. (10—15 Nm)
  4. 2.0L engines—10–15 ft. lbs. (15—22 Nm)
  5. 2.4L and 3.5L engines—16 ft. lbs. (22 Nm)
  6. 3.0L engines—8 ft. lbs. (11 Nm)
  7. Connect the vacuum hose to the EGR valve.
  8. If detached, attach the EGR temperature sensor.
  9. Install the air cleaner and air intake hoses as required.
  10. Connect the negative battery cable.
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The EGR valve is retained to the intake manifold with two bolts.

Dec 07, 2009 | 2000 Mitsubishi Mirage

1 Answer

Egr


if its a low flow code replace the DPFE sensor. If you do a resistance check of it it will prabably be out of specs. Also make sure the two hoses are hooked up and arnt cracked. Also blow thru each one to make sure the tubes going into the exhaust arnt clogged. Also make sure the grn hose going to the egr valve is plugged in. Also apply vacuum to the egr valve to make sure it holds vacuum. If it doesnt then the vlave is bad.

Sep 19, 2009 | 2000 Ford Expedition

1 Answer

How do you replace the egr valve in a 1997 chrysler concorde lx


Chrysler Concorde 1993-1997 3.5L MFI 6cyl
Exhaust Gas Recirculation System
Operation

This system reduces the amount of oxides of nitrogen (NO x ) 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
  1. 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.
  2. Be sure that the hoses at both of the EGR valve and EGR valve control are connected to the proper fittings.
  3. Be sure the electrical connector is firmly attached at the valve control.
  4. 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.
  5. 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

395f8b9.jpg

EGR valve and transducer assembly-3.5 engine



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The EGR valve attaches to the back of the cylinder head-3.5L engine


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Loosen, but do not remove, the EGR tube to intake manifold screws

The EGR valve attaches to the rear of the right cylinder head.
  1. 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.
  2. Remove the electrical connector from the solenoid.
  3. Slide the transducer up and out of the mounting bracket.
  4. Loosen, but do not remove, the EGR tube to the intake manifold screws.
  5. Remove the EGR tube lower screws at the valve.
  6. Remove the EGR valve and transducer.
  7. 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.

To install:
  1. Loosely install the EGR valve and a new gasket onto the cylinder head.
  2. Using a new gasket, attach the EGR tube to the valve and tighten the screws to 95 inch lbs. (11 Nm).
  3. Tighten the EGR tube to the intake manifold plenum screws to 16 ft. lbs. (22 Nm).
  4. Tighten the EGR valve to the cylinder head screws to 16 ft. lbs. (22 Nm).
  5. Reconnect the transducer solenoid to the vacuum fitting on the manifold.
  6. Slide the transducer into the bracket.
  7. Reconnect the vacuum lines and electrical wires to the EGR transducer.
continue...

Sep 04, 2009 | 1997 Chrysler Concorde

3 Answers

Code on diagnostics p0401


Code on diagnostics p0401:

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).

Effects?
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.

Dec 21, 2008 | 1996 Lexus LX 450

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