Question about 1999 Buick Regal

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I have a 1997 ford f 150 4.2 lt engine light came on . insufficient egr flow what could cause the problem? i just replaced the manifold, egr tube and egr valve after i replaced those parts i got the engine light. any ideas

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Http://www.obd-codes.com/p0401 Check here for solution.

Posted on May 27, 2010

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2004 Chevy Venture. "Service engine soon" light on. Code PO401. I believe EGR passage in plugged. Will GM&#;s Top Engine Cleaner work?


diagnostic aids:
a vacuum restriction to the map sensor--a skewed map sensor reading can cause the PCM to read an incorrect MAP change during the EGR flow test
an engine that is running poorly due to mechanical condition such as worn piston rings, ect. can cause low engine vacuum thus EGR flow test will fail
excessif backpressure of the exhaust system can cause P0401
exhaust system leak can cause an insufficient amount of EGR flow
a restriction in the intake manifold such as carbon deposit and casting flash.

Nov 22, 2014 | 2004 Chevrolet Venture Passanger

1 Answer

Engine check light scan said egr insufficient flow . Change egr valve clean intake manifold check light still on


the tube that runs from the egr to the manifold may be plugged you need to take it off and clean it out .CAREFULLY do not bend or kink it, check for carbon build up

Feb 18, 2014 | 2000 Suzuki Grand Vitara

1 Answer

EGR FLOW INSUFFICIENT


On your EGR tube you have two hoses coming off of it. If you put them on in reverse you will get a code of insufficient flow. I put headers on and replaced EGR tube and valve and the flow sensor and that's the code that I received switched the hoses and solved the code

Feb 26, 2013 | 2000 Ford Expedition

1 Answer

Engine code p0401 in 2004 ford explorer 4.0 motor insuficient gas flow detected


p0401 is egr flow insufficiant. check or remove and clean egr and port. and also check the vacuum lines to egr. Insufficient EGR flow frequently is caused by clogged EGR passageways.

Aug 19, 2010 | 2004 Ford Explorer

5 Answers

ENGINE RUNS FINE. SERVICE LIGHT IS ON AND THE CODE NUMBER SHOWING IS PO401. WHAT IS THIS FOR SAYING?


  1. po401 refers to an insuffient flow of EGR gasses
  2. locate egr valve
  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
  8. if not remove valve
  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
  12. if ok reassemble.
  13. locate DPFE sensor
  14. inspect sensor for damage
  15. inspect hose to sensor for damage
  16. replace sensor
  17. 9ecffd7.gif

Aug 10, 2010 | 1999 Ford Taurus

1 Answer

Where is the EGR pressuure sensor at. Need to replace it.


Ford Taurus SES 3.0 L 6-cylinder
EGR valve are directly behind the intake manifold.

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I listen from Taurus owners that just had the same problem (EGR insufficient and EGR excessive) and they replaced the EGR valve and the 4 oxygen sensors (if you do this use Ford sensors). This didn't fix the problem; then changed the Vacuum Regulator Solenoid and a tube mounted sensor part numbers F63Z-9J459-AA, and 4U7Z-9J460-AA. this fixed my check engine light and code issues, as well as it stopped idling so high that it caused the trans to jump into gear. It sometimes jumped so hard that he thought he had a broken motor mount.

Good luck (remember rated this).

May 27, 2010 | 2000 Ford Taurus

1 Answer

Insufficient air flow The EGR valve has been changed twice, but the engine light (401 code, EGR) stills come on what else could this be?


there's a solenoid under the intake manifold which has vacuum hose connects to egr valve. this solenoid is having a lot of problem.

May 27, 2010 | 1997 Toyota Camry

3 Answers

Egr flow insufficient


Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

===
clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
===

Also remove carbon built up behind the EGR valve and the EGR passage tube.

===

Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo

Nov 25, 2009 | 1997 Toyota Camry

3 Answers

Insufficient EGR Flow problem


Specifically DTC P0401 is "Exhaust Gas Recirculation (EGR) Insufficient Flow". Now this is where we have to be careful when we read a code. In this case it is not saying the EGR valve is bad, it's saying the EGR flow is too low. Now it could be because the EGR valve is bad. Or it could be a clogged EGR tube or a broken vacuum line. This is why you have to be careful and check the whole system before you go changing parts. The PCM tests the EGR system during deceleration by momentarily commanding the EGR valve to open while monitoring the Manifold Absolute Pressure (MAP) sensor signal. When the EGR valve is opened, the PCM should see a proportional increase in MAP. If the expected increase in MAP is not seen, the PCM notes the amount of error that was detected and adjusts an internal fail counter towards a fail threshold level. When the fail counter exceeds the fail threshold level, the PCM will set DTC P0401. The number of test samples required to accomplish this may vary according to the amount of detected flow error. Normally, the PCM will only allow one EGR flow test sample to be taken during an ignition cycle. To aid in verifying a repair, the PCM allows twelve test samples during the first ignition cycle following a scan tool Clear Info or a battery disconnect. Between nine and twelve samples should be sufficient for the PCM to determine adequate EGR flow and pass the EGR test. To check the system first you need to remove the EGR valve and if it is clogged or broken. If it is, clean or replace it. If it is okay, then remove the EGR inlet tube from the exhaust manifold and the EGR outlet tube from the intake manifold. If either or both are clogged, clean them out or replace them. Then check the ports in the manifolds themselves to see if they are clogged. If so, clean them out. When you are done, disconnect the battery for about 30 seconds to clear the code and drive the car to see if the light comes back. This should take care of the problem. If not, then you will need to put a scan tool on the car and see what the EGR control system is doing wrong and correct it.
The Valve on this car is electronic, so, unfortunately a vacuum pump will not work for testing.
If you have a scan tool, you can command the pcm to open the valve to see if the valve itself is working.There are really only4 things to go wrong with these things, PCM, wiring,the valve itself, or plugged passages. I have never seen the pcm cause this problem, or the wiring for that matter. If you say you have pulled the EGR and checked the intake passages, then I would be pretty confident in saying the the egr valve itself is bad.
Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

Mar 18, 2009 | 2000 Chevrolet Malibu

1 Answer

I am having trouble getting my check light to go off after I had it checked and the EGR valve was replaced. The light comes back on after about 15 miles of driving and the code reads EGR poor flow. I can...


Insufficient EGR Flow Detected

Possible Causes:
DPFE sensor signal circuit is shorted to ground
DPFE sensor VREF circuit is open between sensor and PCM
DPFE sensor downstream hose off or plugged
DPFE sensor hoses both off, loose or damaged
DPFE sensor hoses connected wrong (reversed)
EGR orifice tube is damaged or restricted
PCM has failed
And what sets the code is…….Engine started, engine running in closed loop under steady cruise conditions, and the PCM detected the DPFE sensor input indicated insufficient EGR gas flow. Run the KOER Self-Test, and if DTC P1408 is present, the fault is currently present. This code sets in 2 Trip(s). The light will stay on until the cause is repaired. A bad EGR valve is only on possible cause.

Hope this helps,

Dave

Feb 28, 2009 | 2002 Ford Mustang

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