26th Oct 2003, 10:51

What is a backing plate? How does it function? Where can I get one? My daughters 94 Blazer is driving me up the wall! Thanks, JP.

20th Jan 2004, 13:58

I had never heard of the gasket with the screen before... i made something myself... i got some stainless steel screen and cut it to size of the 2 holes on the EGR valve... I then JB welded it to the EGR valve... This works great...does'nt leak air or vaccum... Just don't build it up real high...

6th Mar 2004, 18:09


I've also experienced the problems with the EGR Valve.

I'v also "solved" the problem...

By adding a bottle of injection cleaner once in a while, the problem will disappear. You have to do this maybe every fourth time you fill gas.

Of course, installing a filter by Tomco would be better and a more permanent solution, but I don't think this is sold here in Europe.

2nd Jul 2004, 16:23

Hello fellow 4.3 owner. We have owned our 95 jimmy since 2000. I have done all the same as you to include adding a JACOB's pro-street ignition (very hot). The first question is: Have you had the PCM reprogrammed with the "EGR Fix" from GM? It really does help. 2nd: How many miles on truck?

I would recommend removing the intake manifold and having it extrude-honed in the e.g.r. passages. This will leave them slick as a whistle! If you block-off the egr completely the truck will not run very well as the egr gasses are used to "cool" the combustion chambers. Without this cooling affect the truck will "spark-knock" like crazy. This will cause the knock sensor to back-off the timing and the end result will be even less power! There is no winning against a bad design; however, it can be made drivable. Good Luck!

26th Aug 2004, 09:57

Hello, personally I'm new to the forum here, but its nice to know I'm not the only one with the problems so many of you have also mentioned I own a 93 s-10 blazer with the 4.3 and was about to buy a new EGR valve within a day or two, but I'm glad I stopped here first and got the inside scoop I personally am going to give the "filter gasket" a try, if that doesn't work then I don't know ill start a rehab club or something.

5th Sep 2004, 10:02

I also was ready to buy another EGR valve, this would have been the 3rd one. I appreciate everyones comments and suggestions, especially using the Tomco filter.

What is the best way to clean out the EGR? It was mentioned to soak it. Can anyone tell me what to use to soak it and for how long? Also, does the EGR need to be taken apart? Thanks!

7th Sep 2004, 06:01

Sept. 07, 1994 I own a 1994 Chevy Blazer---- And I also have been having problems with the ERG valve. Thank you everyone for the info about the filter from Tomco. But now I have another problem and can't seem to find anyone or any information to correct the problem. The temperature gage has been going to the very top, the check gauge lite comes on. After the gage reaches the top it begin to drop back down, where it stay at approx 210. I have purchased a complete cluster gage and the garage has replaced it. But the problem is there again. When the garage checks it they assure me the temperature is only going to 180'. Can anyone help me, I'm afraid to go to far for fear the blazer will let me sit. Carolyn.

5th Mar 2006, 14:53

I have a 1994 jimmy can aNY ONE TELL me what is this popping noise i`m hearing when I only make a left turn only email at mac1976@sbcglobal.net.

1st Apr 2006, 07:23

March 31, 06

Last poster: Sounds like your CPI injector unit is going bad, pretty common on the Vortec engines at some point. A job for a pretty good mechanic or a serious shadetree mech.

Also, on the EGR problems - when you remove and clean the valve, with the valve off start the engine for a few seconds. It will rev up some and make noise, but the exhaust will blow out any loose carbon in the EGR passages. This will extend the cleaning interval quite a bit, usually.

18th Apr 2006, 07:00

I have a 93 GMC jimmy and the poor idle is driving me crazy! I replaced the fuel filter, egr, fuel spider with regulator, new intake gasket, O2 sensor, distributor, cap and rotor, new spark plugs, and spark plug wires. We also checked the whole system with a snap-on data computer and everything looks OK, and still the piece of sh@t idles like crap. The truck has a strong odor like its running rich, but the system looks fine. It's symptoms point towards the egr, but its brand new, and been clogged TWICE since I bought it. This is only about 3 weeks since I replaced it. I've had it with truck. Not to mention the common loose front end and steering that is very common.

I gave American vehicles a shot and these are my results. I NEVER had a problem with my Toyota!

4th Aug 2006, 05:59

Where is the egr value for 93 jimmy 4.3l?

9th Aug 2006, 14:30

I have a '97 GMC Sierra with the 4.3L. It stumbles so bad when you:

A. Accelerate from a stand still slowly.

B. Try to drive it a cruising speed.

This problem is really starting to drain me, I have already had to replace the cat and muffler because the inside of the cat blew out and clogged the muffler.

My mechanic can't figure it out, and tells me that if the EGR valve was the cause, there would be a code saying so, but the only code is for Random Misfire.

Will a malfunctioning EGR valve always throw an engine code?

13th Aug 2006, 11:34

If your Blazer has rough idle and you can smell gas, there is a feeder tube located in the intake plenum. It is clear plastic hose, they develop hairline cracks and leak. Replacing it should fix the problem.

10th Sep 2006, 17:16

I have a '94 Blazer 4.3 W engine that I have owned for 8 years. It has been a very reliable vehicle for me, with the usual maintenance items replaced along the way.

I have removed the EGR valve and cleaned out the little carbon pieces about 8 times over the years. As suggested, clean around both holes in the intake & start the engine briefly before you replace the valve to blow out loose pieces. That really helps.

Mine always started very well... up until a month ago. It would crank forever before it started, and had a rough idle and terrible smell from the exhaust pipe. It turned out to be the fuel supply line under the intake plenum that supply gas to the CFI/injector assembly was cracked and spaying fuel inside the plenum. The new fuel line nut kit was about $85 at the dealer only. While the plenum is off, clean out the exhaust holes that feed the EGR valve. Starting & running great again.

I hope some of this info is helpful.

30th Sep 2006, 14:52

I own a 1993 GMC TYPHOON with an idle problem, it hunts between 700-750 with light surges causing the engine to shake. We have checked everything logical such as injectors, grounds, coil, wires, plugs, fuel pressure,fuel filter, throttle position sensor, intake leaks, vacuum leaks, changed oxygen sensor, no luck as of yet. Would appreciate any help or ideas (may have missed listing a few we checked). The engine does not stall, smell of gas or have any weird smells from the exhaust, and has it's usual great power in regular driving situations. The gas mileage has been very poor since, about 10-12 miles per gallon. No codes have appeared (wish they did). Thanks for any help.

Rod sytyrod@hotmail.com.