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Old 07-15-2009, 03:30 PM
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EGR valve- chevy- 4.3 W 1994 S10 4X4

My egr keeps growing up with carbon. I add sea foam about every 3rd tank of gas to keep it clean. My question is, can the egr be bad, or is there another reason for this. I have a test pipe in place of the cat. and it didn't help. It works good when its clean so what else could cause it to carbon up? Thanks,been dealing with this a while still no answer. 165000 miles

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Old 07-15-2009, 07:16 PM
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Sounds like the mixture is too rich causing excessive carbon build up. That or it`s severly lacked in tune ups.
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Old 07-15-2009, 09:04 PM
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Tune-up already done, I thought that might help, but no help. It could be running too rich, but there's no smoke and as long as the egr is clean it will get about 20 MPG. I can replace the egr, but I'm thinking it will grow up too. Could the egr be bad and causing this condition? The only other thing is the temp gauge does not seem to work properly. It has to be really hot for the gauge to show anything. I replaced the tempture sending unit, but it did not affect the gauge. IF its not running hot enought, that might be causing the computer to make the rich fuel mix, which would cause the carbon build up? Do you think thats likely? Does the ecm read temperture from the sending unit or the gauge? Thanks for the reply.
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Old 07-15-2009, 09:57 PM
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If you have you have a Carquest in your area ask them about a EGR screen. The 4.3 had a problem with carbon build up in the EGR. The fix was to install a screen kit. The only place around here that sold them was Carquest.



http://bbb-carb.com/Klean_Screen/Gmc.htm
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Old 07-16-2009, 07:56 PM
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Thanks Rodder18, its made by tomco, part #2-1357, for $13.49 Just in case someone else has a problem with the EGR growing up. This screen in made into the gasket and suppose to be good for 5-10,000 miles depending on you driving habits, short trip or further. Thanks again.
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Old 07-16-2009, 09:11 PM
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A friend of mine has a '95 Blazer with the 4.3 Vortec, and is having the same problem. The gasket with the screen works, but the reason it keeps getting clogged in the first place is because the central port fuel injection on those engines places the fuel lines and I believe the regulator inside the intake. After many years and lots of heat those lines begin to leak and will make the truck run very rich. There's alot of good s-10 forums out there, and this seems to be a common problem with the 4.3's.
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Old 07-17-2009, 06:34 AM
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I replaced the CPI unit about 6-8 mos ago. This was a poor design in the first place. I have ordered the egr screen kit, which is only a gasket with the screen built into it. I Plan on installing it today. I love this truck it fits all my needs, being a 4x4 and small. Mine is the Blazer and the grandkids love it.
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