Question about 2001 Ford Focus

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If i have to unplug the egr valve should it b left open or closed?my cars idlin bad an dont want to go,it dies at lights an stop signs

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Closed An EGR Valve will cause your engine idle really rough if it is stuck in the open position,but at highway speeds 45-65mph it will run smooth.It is only suppose to open and allow exhuast gasses into the intake manifold for emission purpose's when going down the highway.

Posted on Apr 09, 2011

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That sounds more like idler control valve, but the egr is in close position all the time, opens only when is in gear, and is controled by computer, rpms, etc. Thanks.
P.S. what you can do is to check if is open when the engine is off, is this is the case then you need a new egr. good luck.

Posted on Apr 09, 2011

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1 Answer

I have a 0402 fault code on my 16 hid xsara what does that mean?


OBD II Fault Code
  • OBD II P0402
Fault Code Definition
  • Excessive EGR Flow
Symptoms
  • Check Engine Light will illuminate
  • In most cases, there are no adverse conditions noticed by the driver
  • In some cases, there may be performance problems, such as dying at stop signs or rough idling, hesitation, misfires or lack of power (especially during acceleration), and a decrease in fuel economy
Common Problems That Trigger the P0402 Code
  • Excessive Vacuum signal or Electrical signal to the EGR Valve
  • The EGR Valve is defective and is opening too far or not properly closing
  • Lack of proper EGR system feedback to the computer from the:
    • Manifold Absolute Pressure Sensor (MAP)
    • EGR Temperature Sensor
Common Misdiagnoses
  • Ignition System
  • Fuel System
  • Oxygen Sensor
  • EGR Valve

Oct 31, 2016 | Cars & Trucks

1 Answer

2002 dodge durango dies when i turn corner and stop lights


Sounds like the idle speed controls are not working, the Vacuum system is losing pressure when you use the Brake booster or the EGR valve is not closing completely.

At first, upon reading your problem I noticed the turning and stopping can cause the fuel to slush in the tank, but once settled it should be mixed and available for the fuelpump, eliminating fuel starvation or contamination as the problem.

But when you are in a corner turn or braking at a light you can have your foot on the brake pedal with an automatic transmission. This can vent the Vacuum out of your motor if the Brake Booster is bad or if there is a Vacuum leak in the intake or Vacuum lines or solenoids you are overtaxing the system when applying the Brake booster.

So there are simple Vacuum gauges which can be attached to the engine to measure the Vacuum available. One tool may be available in the free tool loaner programs the autoparts stores have.

A bad EGR valve can have a broken diaphram leaking Vacuum. A dirty EGR can disrupt vacuum in the intake if the valve does not close tightly causing a problem at idle.

As I mentioned, the idle speed controls are suppose to give a minimum base idle speed. The onboard computer in your vehicle adjusts the timing and fuelmix to provide that. A throttle position sensor sends a signal to make the other parts work. This part can be checked with an Ohmmeter by unplugging the power connector and measuring the resistence as the throttle is opened and closed. It should smoothly increase resistence.

I am curious about the outcome of this problem and hope my solution is the best one for you.

Aug 11, 2012 | 2002 Dodge Durango

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I have a 98 Chevy Malibu. When the engine is cold it starts and idles fine but as it warms up the rpm's surge when I come to a stop (say a light or stop sign). If I turn it off and try to restart it...


YEP COULD BE EGR VALVE STUCK OPEN BUT YOU WOULD GET CHECK ENGINE LIGHT WARNING.YOU COULD HAVE BAD GAS OR NEW REPLACE FUEL FILTER AND AIR FILTER CLEAN FUEL INJECTORS SEE IT THAT HELPS.

Sep 18, 2011 | 1999 Chevrolet Malibu

1 Answer

Loss of power, hesitation, ODBC II error code P0404, SES light come on sometimes


P0404 - Exhaust Gas Recirculation Circuit Range/Performance OBD-II Trouble Code Technical Description

Exhaust Gas Recirculation Circuit Range/Performance
What does that mean?The EGR (Exhaust Gas Recirculation) system's purpose is to redirect exhaust gas back into the cylinders. Since exhaust gas is inert, it displaces oxygen and fuel, thereby lowering cylinder temps, which, in turn, lowers oxides of nitrogen emissions. For that reason it needs to be carefully metered into the cylinders (via the EGR valve) so as not to adversely affect the engine's performance. (Too much EGR and the engine won't idle).
If you have a P0404, then the EGR valve is likely an electrically controlled EGR valve instead of a vacuum controlled EGR valve. Also, the valve will usually have a feedback system built into it that informs the PCM (Powertrain Control Module) what position the valve is in; open, closed, or somewhere in between. The PCM needs to know this to determine whether or not the valve is operating as needed. If the PCM determines that the valve should be operating, but the feedback circuit shows that the valve is not open, this code will set. Or if the PCM determines the valve should be closed but the feedback signal indicates that the valve is open, this code will set.
SymptomsThere may be no symptoms of a P0404 DTC other than the MIL (malfunction indicator lamp) or check engine light. However, Exhaust Gas Recirculation systems are inherently problematic due to carbon buildup in the intake manifold, etc. This normal buildup can lodge in an EGR valve, holding it open when it should be closed. If this is the case, the engine may idle rough, or not at all. If the valve has failed and is NOT opening, then symptoms would be higher combustion temps and as a result, higher Nox emissions. But the latter symptoms aren't going to be noticeable to a driver.
CausesUsually this code points to either carbon buildup or a bad EGR valve. However that doesn't rule out the following:

  • Open or short in the 5 Volt reference circuit
  • Open or short in the ground circuit
  • Open or short in the PCM controlled voltage circuit
  • Bad PCM (less likely)
Possible Solutions
  1. Using a scan tool command the EGR valve to open while watching the actual EGR position (it will probably be labeled "desired EGR" or something similar). The actual EGR position should be very close to the "desired" EGR position. If it is, then the problem is likely intermittent. It may have been a lodged piece of carbon that has since dislodged, or it could be a bad EGR valve winding that intermittently opens or shorts as the valve temperature changes.
  2. If the EGR "desired" position is not close to the "actual" position, then unplug the EGR sensor. Check for a good 5 Volt reference voltage to the connector. If it doesn't show a reference voltage, repair an open or short in the 5 Volt reference circuit.
  3. If there is a 5 volt reference voltage, activate the EGR with the scanner, monitor the EGR ground circuit with a DVOM (Digital Volt/Ohm meter). It should indicate a good ground. If it doesn't then repair the ground circuit.
  4. If there is a good ground, then check the control circuit. It should indicate voltage that varies according to the percentage that the EGR is open. As it's open more, the voltage should increase accordingly. If it does, then replace the EGR valve.
  5. If the voltage doesn't increase incrementally, then repair open or short in EGR control circuit.

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2 Answers

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2 Answers

1992 f250 occasionaly surges and dies when i stop at lights


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also check the two hoses connected to this sensor for crack or blockage
check the pipe that goes to the egr valve for crack
it won't hurt to pull the egr valve back out to check to see if there is any thing cause the valve to stay open

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2 Answers

Truck has been dying surging and dying when i come to stop at li


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3 Answers

Will a faulty E.G.R.valve on a 1988 Olds.Cut.Sup.FWD cause a hot engine to stall when stopping at corners?


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