Question about 2004 Mitsubishi Diamante

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Hi, I have a Mitsubishi Diamante ES2004 love my car. My engine light came on so I took it in for Diagnosis test. The trouble code p0401, which means exhaust gas recirculation flow insufficient detected. Possible Causes: EGR- control vacuum is too low (source vacuum hose is loose) EGR- exhaust tube is clogged or restricted EGR- solenoid valve has sailed] EGR- valve connector is damaged (check pins for damage, and for moisture) EGR- valve does not open (the valve may be damaged or failed) EGR- MAP sensor has failed PCM- has failed Would like to know the name of the parts that are needed, and the price

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1 Answer

It doesn't work quit that simply

You have all the items listed, that you need to be
familar with & know how to test

Only then-- if one of those items fails a test-- do you replace it

So you need a repair shop

Way to complicated-- even for some professional
mechanics just starting out--- or not up to speed

Posted on Dec 08, 2012

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Posted on Jan 02, 2017

pishta68
  • 579 Answers

SOURCE: I looked up the error code in the instructions

the EGR pipe that feeds exhaust gasses to the intake manifold is clogged, you need to remove and clean out. soak in carb cleaner or use mechanical means to clean carbon and soot out of small metal pipe.

Posted on Oct 21, 2010

Mustgo
  • 2359 Answers

SOURCE: SEL code P0401 (2004 Mitsubishi Galant 2.4L)

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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