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Code po401 stalls at times while slowing down or coming to a complete stop. replaced egr valve, improved quite a bit, but still not 100% correct. it used to stall everytime , usually when cold, at all stops. wouldn't idle, until egr valve was replaced. idles fine, but again at times stalls coming to a stop.

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  • 157 Answers

Sometimes the intake manifold gets carbon in it from a bad egr valve. You may need to pull the EGR and see if you cant clean it a little.

Posted on Oct 19, 2013

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Posted on Jan 02, 2017

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SOURCE: Idle Problem when you slow down of come to a stop idle goes low

THis has happened to me in the past. My fix was to clean the throttle body. The problem began after my battery died. The computer was defaulted back to its original settings after replacing the battery. Once I cleaned the throttle body, everything was fine. This happened at about 85,000 miles.

Posted on Mar 13, 2009

  • 265 Answers

SOURCE: Alfa 156 sometimes stalls when I slow down.

It's the air measuring tube that will be clogged probabily.
In the air intake, you'll find an air measuring valve ( older models ) or a hot wire system ( newer models ).
See if the valve can move smoothly, and/or if the measuring wire is totally clean! CAUTION, those parts are very fragile!

The idle regulation valve can also be faulty or clogged ( or its tubing ). This specially on older engines were some oil is consumed...

Posted on Aug 22, 2009

thunderalley
  • 432 Answers

SOURCE: car stalls when you slow down for a stop, wont stay running idle

fuel filter most likely

Posted on Sep 24, 2009

  • 11 Answers

SOURCE: starts/stalls won't run until pedal tapped, 2

Check your IAC motor (Idle Air Control) It could be sticking open.
Ps. Might be called Idle Speed Control motor it depends on the make and i forget what chevy calls theres.

Posted on Mar 11, 2010

  • 154 Answers

SOURCE: unstable idle on my 1991 Toyota Cressida. Stalls

EGR WILL NOT HELP.. IDLE AIR CONTROL. POSSIBLE

Posted on May 31, 2010

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Using my OBD II on 2000 honda prelude trouble codes PO401 & (PO401 pd) all reads MIL on, monitors, 1 INC, EVAP, 7 ready, MISFIRE, FUEL, COMP, CATLYST, 02 sensor, 02 HTR, EGR. Will be cleaning out EGR, BUT...


I would start with whatever is causing the misfire. That seems to be the core of your emissions codes. Putting all codes together it seems to be clogged injectors vacuum leak. Seems to be causing stalling too.

Jun 09, 2017 | Honda Prelude Cars & Trucks

1 Answer

Code po401


A code P0401 most likely means one or more of the following has happened:
  • The DPFE (differential pressure feedback EGR) sensor is faulty and needs to be replaced
  • There is a blockage in the EGR (tube), most likely carbon buildup
  • The EGR valve is faulty
  • The EGR valve may not be opening due to a lack of vaccuum
Possible SolutionsIn fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.
  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM'sicon1.png & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve

Nov 04, 2012 | 2003 Hyundai Santa Fe

1 Answer

Stalls in gear, shudders while accelerating.. Cannot Resolve.


PO300 code means miss fire on the cylinders, That is usually caused buy bad spark plugs end wires,PO401 code means a problem with the EGR ,Valve Sticking.

Oct 18, 2012 | 2000 Isuzu Trooper

1 Answer

I have a 96 sonoma 2.2 thats running too rich and has a p1406 code


P1406 EGR Valve Pintle Position Circuit Fault
This code is usually caused by carbon buildup in the EGR valve. The carbon deposits prevent the valve from closing completely.

After removing the EGR valve, clean the pintle seat area of the valve and the corresponding passageway in the engine.

or simply replace the EGR valve.

The purpose of you EGR Valve is to recycle un-burned fuel back into the engine, not only improving fuel economy by reducing the engines pumping losses, the EGR increases the mass in the intake; more mass means higher pressure, or less vacuum. Now the piston has less resistance during each intake stroke, which results in better gas mileage.

So if your EGR Valve is clogged, damaged or simply just not working - the those rich un-recycled fuels will make your car burn richer. (Which will make you burn more fuel.)

Hope this helps!

Mar 07, 2012 | Cars & Trucks

1 Answer

I have the code PO401 AND PO402 codes on my 2002 focus, any suggestions?


PO401: EGR insufficient flow detected
PO402: EGR excessive flow detected

A code P0402 most likely means one or more of the following has happened:

The DPFE (differential pressure) sensor is faulty and needs to be replaced
There is a blockage in the EGR (most likely carbon buildup)
The EGR valve is faulty
The EGR valve may not be opening due to a lack of vaccuum

Feb 25, 2012 | 2002 Ford Focus

1 Answer

I have a 1997 chevy lumina. i had 2 coded before, po420 and po401. i changed the egr valve, and now the po420 is gone. i just replaced the egr tube, cleared the codes, and now the po401 is back. car sounds...


Well, the po401 is saying is that the egr valve has restricted flow. After changing the egr and the tube, something else is causing the restriction. a more thorough diagnosis is recommended. The po420 code sounds like a possible catalyst failure or an o2 sensor failure.

Oct 16, 2010 | 1997 Chevrolet Lumina

1 Answer

I have a 99 Windstar 3.8L Keep getting DTC PO401 have replaced DPFE EGR Valve and EGR tube still keep getting Code PO401


Does the egr vavle open ? You will need to use a scanner to test the dpfe voltage when the egr valve is energized you should read around 3.5 4.00 volts. Also you could remove the vacume line from the egr valve and with the engine running you should see around 100 rpm drop in engine rpm at least this would indicate the egr valve is capable of flowing egr gases through the system to the cylinders.

May 30, 2010 | 1999 Ford Windstar

1 Answer

1992 chevy corsica runs rough,stall or dies after stopping


Sounds the EGR valve and EVP sen is bad even if you tested it. The EGR valve cntrols idle and if carbon up will make the car stall or idle high and low (rpms going up and down) This was common on all cars during that time. I would say replace the EGR valve and senosr. This should take care of the problem. One more thing have the fuel pressure check on the car.

Mar 20, 2009 | 1992 Chevrolet Corsica

2 Answers

Engine stops


Low idle sensor is probably bad.

Nov 05, 2008 | 1994 GMC Safari

2 Answers

1996 Camry 100 km stalling


You have one of two very common problems.
Number one may be a stuck open EGR valve
Number two would be a failing Idle Air Control valve (IAC).
Try this: Open the hood & locate the EGR valve, close to the firewall, behind the intake. Find & take with you a small hammer. The next time that it happens, open the hood & tap on the EGR valve. If it is sticking "open" the tapping may dislodge the carbon particles that are keeping it open.When the EGR valve is open, exhaust is getting into the intake at idle, and this will def stall out the car.
There is no repair to the IAC valve, it would need to be replaced if it is bad.
One of these two scenarios will cure your problem, I see it every day.

Oct 07, 2008 | 1994 Toyota Camry

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