Question about 1999 Chevrolet Silverado 1500

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Where is the egr valve located on a 1999 silverado 5.3 vortec

I think the egr valve needs cleaning on my truck i would like to find where its located

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  • tford395 Feb 27, 2009

    the truck seems to have lost power and there is no check engine light coming on. the gas milage has gone down about 3 miles per gallon. i have put new fuel pump on cause it went out. new plugs and wires, fuel filter, air filter, pcv valve. i think it might have an exhaust leak between the motor and the converters. thats where it sounds like its comin from but im not sure of it. the truck doesnt seem to have a miss or anything just loss of power and gas milage

  • tford395 Feb 28, 2009

    i cleaned the Mass airflow sensor this afternoon and it helped a little but it still seems like it doesnt have the power it did

  • yadayada
    yadayada May 11, 2010

    Do u have a trouble code or check engine light indicationg the EGR has a problem? if not then the valve is not the source of whatever problem u have, which i would like to hear about so I can help fix the real problem.

  • Shaun Smith
    Shaun Smith Nov 15, 2013

    yes p0430

  • Shaun Smith
    Shaun Smith Nov 15, 2013

    i have changed the sensors ,had the catalyst convertor checked i cant seem to get the check engine light off

  • yadayada
    yadayada Nov 15, 2013

    This is not an EGR problem, the catalytic converter on cylinder bank 2 is likely worn out and is not cleaning up the exhaust stream as it should. bank

  • yadayada
    yadayada Nov 15, 2013

    Poss causes of the fault code P0430

  • yadayada
    yadayada Nov 15, 2013

    Worn converter, intake vacuum leaks, exhaust leaks upstream of bank two and faulty spark plugs.

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Try cleaning the inside of the MAF sensor with CRC brand MAF cleaner, it is availiable at any auto parts store for around $5

Posted on Feb 27, 2009

  • Shaun Smith
    Shaun Smith Nov 15, 2013

    i did the light went off for a little while but came back on

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The EGR should be top, front of the engine right beside the water inlet (thermostat housing) just behind the drive belt.... However make sure it is the EGR that's the problem!!!

Posted on Feb 27, 2009

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The EGR valve is located on the intake manifold.If there was something stuck in it your vehicle would run rough or the idle may be high. This part usually does not ever need to be cleaned.

Posted on Feb 27, 2009

  • Shaun Smith
    Shaun Smith Nov 15, 2013

    im trying to get smogged but code p0430 keeps popping up

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Egr valve 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

Sep 25, 2009 | 1999 Chevrolet Malibu

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