Question about 1998 Chevrolet K1500

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I have a 1998 k1500 i think i have a bad egr valve but im not sure. there is not a vaccum hose on it. so i cant check it that way. any tips

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  • nathanikel Aug 02, 2009

    yes that is correct it is electronically controlled. how do i tell if it is bad. the problem has been on going. the truck runs rough gets bad fuel mileage. i have done a full tune up. cap and rotor, plugs and wires,new distributor, check engine lights have also come on and it pull a code for bad catalitic converter. had those replaced. two weeks later the same code cam up and took it back to the shop and they replaced the cats. so far no light put still runs rough and bad fuel mileage. so i pulled the egr valve there is carbon a lot of carbon build up. it just cant tell if it is bad or not. hope this helps

  • nathanikel Aug 02, 2009

    bad fuel mileage, runs rough at idle, goes away at faster speed, strong exhaust odor in engine compartment, check engine light on.

  • casey kivela May 11, 2010

    what is it doing for you to think that it is the EGR

  • jiffybay May 11, 2010

    please we need more info , what is the problem, why do you think it needs an egr valve?, no vacuum hose because they are electronic egr controlled by the pcm


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The EGR's rarely go bad if you have alot of carbon and it comes and goes then clean the EGR of carbon and try to clean the carbon from the intake as well. A small piece of carbon lodged in the EGR will keep it open and cause these problems, it will then blow out run good til the next piece get lodgedinside. If the EGR failed, because it is electronic, it would give you a code as to the pintle selonoid failure.

Posted on Aug 02, 2009

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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.



Posted on Dec 19, 2009

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