How-To: EGR Valve Cleaning

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How-To: EGR Valve Cleaning

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Blazer Forum >> Mechanical & Maintenance >> General Tech Help >> 2nd Gen S-series (1995-2005) Tech >> How-To: EGR Valve Cleaning

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How-To: EGR Valve Cleaning - 3/26/2008 3:09:23 PM

garry2000blazer

Posts: 125
Joined: 2/28/2007
From: Huntsville, AL
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This will guide you through removing, cleaning, and reinstalling your Exhaust Gas Recirculation (EGR) valve. It’s an easy job that takes less than an hour.

Tools needed:
- 10mm socket
- 10”-ish socket extension.
- Torque Wrench
- Gasket Scraper
- small flexible brush. The bristles should be 1 to 1.5 inches long.
- rubber stopper or anything to plug the intake port (I used a large vacuum cap turned upside down and then added electrical tape to get it to the right diameter) This is for optional step 4.

Materials needed:
- A spray can of carbon cleaner. I used STP carburetor cleaner and it seemed to work fine.
- New EGR gasket (get the one with the screen…see the picture below in step 6)

Approximate time: 30 – 45 minutes.

Your EGR valve is towards the front of your intake manifold.

Step 1:
Disconnect positive battery cable and then remove the electrical connector from the top of the EGR valve.

Step 2:
Remove the 2 bolts holding the EGR valve to the intake manifold and pull the EGR valve off of the engine. The cavity in the bottom of the EGR valve is what you’re going to clean out.

Step 3:
Spray a healthy amount of carbon cleaner into the cavity and then use your brush to scrub as much of the cavity as you can get to. Rinse the cavity out with more carbon cleaner. Repeat until you’re not getting any more carbon in your rinse. It’s hard to tell in the pictures because the carbon absorbs light and makes the cavity look like a black hole, but if you look carefully at the before and after pictures, you’ll see the difference.

This is what it looked like before I started:

This is what it should look like when you’re done.

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2000 LT 4x4
'81 Harley Sturgis Lowrider

Post #: 1

RE: How-To: EGR Valve Cleaning - 3/26/2008 3:12:19 PM

garry2000blazer

Posts: 125
Joined: 2/28/2007
From: Huntsville, AL
Status: offline

Step 4 (Optional, but recommended):
While the EGR valve is still off, start the engine for a few seconds to let the pressure from the exhaust blow out through the exhaust side opening for the EGR valve. This step is a good idea because it cleans out any loose chunks of carbon in the exhaust-side plumbing of your EGR circuit. You have to be aware, however, that there will be a huge vacuum leak because the intake manifold port is open and this can cause the engine to race. What I did to prevent the engine from racing (and to prevent the intake vacuum from sucking any of that debris into the intake side of the circuit) was to plug the intake side port. It worked well and gave me the piece of mind to let the engine run for a few more seconds than I would have if the engine was racing.

Step 5:
Using the gasket scraper, clean off any of the old gasket from the intake manifold and bottom of the EGR valve. Then use some of the cleaner on a rag and wipe both surfaces so you have a clean surface for your new gasket.

Step 6:
Install your new gasket (the bolts in the picture are only there to hold the gasket in place for the picture), place the EGR valve over the gasket, and then install the bolts. Torque to 20-25 ft/lbs.

Step 7:
Plug the electrical connector in and the reconnect your battery.

You are done!

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2000 LT 4x4
'81 Harley Sturgis Lowrider

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Post #: 2

RE: How-To: EGR Valve Cleaning - 3/26/2008 3:25:32 PM

Dturner14

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Joined: 6/20/2007
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Thanks 4 the info Garry.

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RE: How-To: EGR Valve Cleaning - 3/26/2008 3:54:52 PM

Smoked

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Joined: 3/17/2008
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Awesome writeup... what are the benefits to performing this procedure and how are they realized? ...thought that would be a cool addition to the how-to :)

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RE: How-To: EGR Valve Cleaning - 3/26/2008 5:46:42 PM

swartlkk

Posts: 15304
Joined: 5/1/2005
From: Waterloo, NY
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Great writeup Garry!

One thing to note, the area that is often overlooked is the pintle area (the torx head in your pictures). This is the actual place that is known for getting built up with carbon, holding the valve open. You can push the pintle back and clean the sealing surfaces real good. What I do is put some carbon cleaner in a small, but suitable container (I have a 1" deep 3x3 stamped metal tray) and then just stand up the EGR valve in about a 1/4" of carbon cleaner. You may have to use a small flexible straw to let the air out of the valve itself so that the cleaner can get up inside and eat away at the carbon. Anyway, if you do this while you are messing around cleaning up the gasket surface on the lower intake and running the engine to flush out the EGR supply tube, it should be nice and soaked in by the time you have finished that work and ready for some easy cleaning. You will want to push the pintle back a bit and work a brush down into the area to clean out the carbon on the sealing faces.

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RE: How-To: EGR Valve Cleaning - 3/26/2008 6:12:33 PM

Thor_449

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Joined: 3/24/2008
From: Plymouth, Indiana
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i think i have a different engine then the one in the pics (94 4.3 vortech) but my EGR looks like it has two sections to it does this require anymore additional cleaning?

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RE: How-To: EGR Valve Cleaning - 3/26/2008 6:39:56 PM

swartlkk

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From: Waterloo, NY
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The pictures in this thread are for the 96+ trucks. Yours will be slightly different. You still want to thoroughly clean the inside and the pintle valve area of the EGR valve. This is true for all EGR valves whether electronic or vacuum controlled.

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RE: How-To: EGR Valve Cleaning - 3/26/2008 7:22:34 PM

Thor_449

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From: Plymouth, Indiana
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lol thats what i get for not reading

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RE: How-To: EGR Valve Cleaning - 3/27/2008 7:04:23 AM

garry2000blazer

Posts: 125
Joined: 2/28/2007
From: Huntsville, AL
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quote:

ORIGINAL: Smoked

Awesome writeup... what are the benefits to performing this procedure and how are they realized? ...thought that would be a cool addition to the how-to :)

Thanks. Anytime your truck has a rough idle or the throttle response doesn't seem to be what it used to be, the first thing you should try is cleaning your mass air flow sensor (MAF) and EGR valve. The reason I say to do these first is that both jobs are cheap, easy, and don't take long to do. My truck wasn't giving me any reason to think I had a problem, I just cleaned them because they hadn't been cleaned in 134K miles. When I was done I noticed a big difference in smoothness and throttle response, and a small increase (maybe .5mpg) in gas mileage.

I posted a How-To for the MAF sensor a week or so ago.

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RE: How-To: EGR Valve Cleaning - 3/27/2008 10:00:18 AM

lennyblazer

Posts: 1988
Joined: 5/6/2007
From: Appleton, WI / Houghton, MI
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Cool write up, thanks for posting it, this summer I will be cleaning both the MAF and EGR hopefully to get an increase in gas mileage, since mine seems to be low lately for even winter time driving. I drove home and normally get close to 20mpg on the highway and got like 16 so betweent the tires and the fact that the EGR and MAF have probably never been cleaned in 140k miles I hope it should help.

EDIT: COuld you post a picture of the brush you used?

< Message edited by lennyblazer -- 3/27/2008 10:06:41 AM >

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RE: How-To: EGR Valve Cleaning - 3/27/2008 10:22:48 AM

garry2000blazer

Posts: 125
Joined: 2/28/2007
From: Huntsville, AL
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I'm leaving for Vegas in the morning (gotta love business trips to sin city), so I won't be able to get a picture of the actual brush for a week or so. Here is a snapshot I found on the net that shows the type I used. I ended up using the bristles on the end because the cavity is so shallow a bottle brush is pretty much useless to get into the area under the pintle. A narrow paint brush would probably work just as well. Just stick the ends of the bristles into the cavity and work it around (and around and around....).

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RE: How-To: EGR Valve Cleaning - 5/5/2008 8:16:30 AM

portcqb

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Joined: 3/13/2008
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Thanks for the instructions, I just did mine and it made your dirty pic look clean compared to mine. I don't know if it blew anything out when I plugged the vacum port and ran it, but it threw a check engine light for EGR malfunction I had to clear.

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RE: How-To: EGR Valve Cleaning - 5/5/2008 9:50:23 AM

swartlkk

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From: Waterloo, NY
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Should probably be noted that the CEL is normal if the EGR valve is not installed both affixed to the engine and connected electrically.

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RE: How-To: EGR Valve Cleaning - 5/5/2008 12:51:08 PM

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I have a 2002 4x4 2dr 4.3 blazer and the egr valve is not at the front of the engine,and i cannot find it,anybody know were it is

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Post #: 14

RE: How-To: EGR Valve Cleaning - 5/5/2008 7:44:49 PM

swartlkk

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From: Waterloo, NY
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You don't have to worry about that. The mid-'02+ don't have a conventional EGR system.

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RE: How-To: EGR Valve Cleaning - 5/8/2008 7:15:20 AM

Kimchoc

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can you post a link to the MAF sensor cleaning?
Thanks

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RE: How-To: EGR Valve Cleaning - 5/8/2008 8:48:01 AM

nj4x4blaze

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From: North Jersey
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http://www.blazerforum.com/m_145331/tm.htm

Here's the link for the MAF How to. Great write up Gary. I will be doing this soon to my truck.

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RE: How-To: EGR Valve Cleaning - 5/8/2008 1:01:17 PM

Kimchoc

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NICE stuff. Great write ups !!!!!
Much appreciated here in Va. Beach.

Gary B.

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RE: How-To: EGR Valve Cleaning - 9/12/2008 5:59:34 PM

icom

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quote:

ORIGINAL: nj4x4blaze

http://www.blazerforum.com/m_145331/tm.htm

Here''s the link for the MAF How to. Great write up Gary. I will be doing this soon to my truck.

the pics are missing for the MAF cleaning job

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Post #: 19

RE: How-To: EGR Valve Cleaning - 9/12/2008 6:09:07 PM

swartlkk

Posts: 15304
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From: Waterloo, NY
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quote:

ORIGINAL: icom

quote:

ORIGINAL: nj4x4blaze

http://www.blazerforum.com/m_145331/tm.htm

Here''''s the link for the MAF How to. Great write up Gary. I will be doing this soon to my truck.

the pics are missing for the MAF cleaning job