Question about 2000 Chevrolet Malibu

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2000 malibu has a p0404 code open position and the engine will not run very well except at idle what do i need to do

I had to change the air pump and the check valve that is when i had the problem

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  • Expert
  • 49 Answers

EGR valve is sticking...replace it

Posted on Mar 28, 2014

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 169 Answers

SOURCE: check engine light comes on

Do you hear the air pump run when you start the car? No? Check the A.I.R. pump fuse in the under hood fusebox. if it is blown then you probably need a new air pump motor. If the fuse is not blown then the relay could be the culprit. if you can hear the pump running when you start it the engine then you probably just have some wiring issues from the relay to the ecm it can still work ok but fail the resistance test that the computer runs randomly. Give some more info and I'll help you through this.
Good luck.
Please rate this response , and let me know if ya need more help!

Posted on Aug 31, 2008

j_del
  • 1586 Answers

SOURCE: disgnostic code meaning

P0404 Exhaust Gas Recirculation Control Circuit Range/Performance
P0405 Exhaust Gas Recirculation Sensor “A” Circuit Low


It sounds like you have a failure of the EGR valve.

Posted on Sep 28, 2008

freetek
  • 5568 Answers

SOURCE: power loss

Can't answer your last question but catalytic convertors that are just not working anymore won't cause any loss of power. However, if they have shattered inside (they are kind of a ceramic honeycomb) they can dump junk into the exhaust system that can eventually clog your muffler or resonator.
Checking whether this has happened isn't difficult; after the warm up of the engine, either you or a helper needs to listen to the exhaust note. If firing of the cylinders is still distinct, the system isn't clogged with shrapnel; if it seems to hiss at higher RPMs, it is likely clogged.
This effect is easy to miss; I've had two failures and when cold, the engine would pull fine because the chunks of ceramic would fall to the bottom of the muffler and glue together somewhat. Once hot and agitated, they would clog the muffler and cause a severe loss of power but the idle would be OK. A hill that I would normally pull at 70 MPH, I couldn't top at all; had to sit and wait for things to cool down before proceeding.
It also seems some engines appreciate a bit of back-pressure in the exhaust system because the car gained in mileage and pulling power for several thousand miles before the clog became critical causing the mileage to fall sharply along with the power.  

Posted on May 23, 2009

ourhowse
  • 2007 Answers

SOURCE: 1998 Chevy Truck 1/2 ton 350 engine. Trouble codes

404 is exhaust gas recirculation circuit, and 405 is exhaust gas recirculation sensor circuit low. EGR sensor or ground?

Posted on Nov 13, 2009

Mustgo
  • 2359 Answers

SOURCE: 1998 Chevy Tahoe with P0404, P0405, and P0430 Trouble Codes

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

Posted on Dec 19, 2009

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2 Answers

97 malibu with a 3100 engine - it dies if you let off the gas - so it won't idle - but runs fine as long as you are giving it gas


idle air control motor is most likely not working . sometimes you can clean them out with intake cleaner spray or you may need to replace it . also look for vacuum leaks . another possible problem is a egr valve stuck open .i would think the engine light would have come on if that was the case for the egr valve

Nov 05, 2013 | 1997 Chevrolet Malibu

1 Answer

I have a 2002 Chevy Malibu 3100 engine I had a bunch of error codes so I replaced the spark plugs plug wires put in a brand new EGR valve cleaned the throttle body cleaned the mass airflow unit changed the...


Use Google to look up your codes & solutions

OBD PO404

You need to study OBD2 Systems & learn to diagnose
issues & not install ANY parts until you find a problem
& component test it,that includes plug wires

Aug 22, 2013 | 2002 Chevrolet Malibu

1 Answer

2000 Malibu won't idle unless u hold gas a lil


Is the check engine light on ? Is the throttle body clean ? Is the idle air control valve working ?

Jun 30, 2013 | Cars & Trucks

1 Answer

I am getting OBD-II trouble code P0404 on my 2001 Chevy Malibu, and want to know, what I can do to correct that?


Here is the website I use for OBDII codes:
http://www.obd-codes.com/trouble_codes/

And it says:
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).
FB.init("dd7d9e9681341cde77587bc6a2029f6f"); OBD-Codes.com on Facebook

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.
Symptoms

There 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.
Causes

Usually 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.

Aug 07, 2011 | 2001 Chevrolet Malibu

1 Answer

2004 dodge 1500 4 x 4 the engin mlight came on and the code is p0404. What does P0404 stand for?


SYMPTOM
P0404-EGR POSITION SENSOR PERFORMANCE

WHEN MONITORED
Engine running.

SET CONDITION
The EGR flow or valve movement is not what is expected.

POSSIBLE CAUSES
- Good trip equal to zero
- Excessive resistance in (F856) 5-volt supply
- (K34) EGR sensor signal circuit shorted to ground
- EGR assembly
- (K35) EGR solenoid control circuit
- Intermittent condition
- (K34) EGR sensor signal circuit open
- (K34) EGR sensor signal circuit shorted to ground
- (K900) sensor ground circuit open
- EGR assembly (ground)
- PCM
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May 28, 2011 | 2004 Dodge Ram 1500

1 Answer

Engine light came on in my dodge caravan sxt 3.3L 6cyl. Code P0404. It seems to be running fine, how do I check the EGR valve myself? Any advice would be greatly appreciated.


To check the egr yourself you will need a hand held vacuum pump. To perform the test start the van and let it warm-up, then remove the top vacuum hose from egr valve and attach hand vacuum pump to egr valve. Apply about 5 in-hg vacuum to the egr valve. With the engine at idle speed and vacuum applyed the engine idle speed will drop or stall. If not then the egr valve is faulty and will need to be replaced. If the engine didi change idle speed and or stalled the egr valve is good. Hope this will help you.

May 17, 2010 | Cars & Trucks

1 Answer

Starts/stalls won't run until pedal tapped, 2 miles in town, 6 miles highway, then1000-1500 idle. shut down 9 hours, start/stall tap pedal runs return 6 mi. highway,2miles town same high idle. checked code...


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.

Mar 11, 2010 | 2000 Chevrolet Malibu

1 Answer

Can't keep my Escalade running


Have you checked the EGR Valve. Does it miss at idle or all the time?
A stuck "open" EGR Valve will make it hard to start and it will miss at idle.
It might also set your Check Engine light and give you a code P0404.

May 28, 2009 | 2004 Chevrolet Tahoe

1 Answer

PCM code P0404


P0404 - Exhaust Gas Recirculation (EGR) Open Position Performance
I suspect the EGR got stuck closed, u will need to put around 30 miles on the car before the light will return if the problem is still present..

May 26, 2009 | 1999 Saturn SL

1 Answer

Car will not restart after running


If it turns over, but won't start when hot: first, change your air filter. 2. Check your engine ground connection. 3.Check for a loose connection in the ignition system 4. You could have a faulty idle control valve. 5 . Faulty coil, Mass air flow, idle control sensor... but you should have an engine light on if it's one of those.

May 26, 2009 | 2003 Chevrolet Malibu

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