Carbon keeps building up in the EGR valve. WHY?? and HOW DO I PREVENT IT? The engine is in PERFECT shape otherwise.
First off, don't spend any money on this problem. I can't believe people are recommending you replace things like the fuel filter, pressure regulator, etc. Then again, I can, this is why I can find all those brand new parts in the wrecking yard...people spend as much money as they have guessing at the problem, and when they run out of money and its still not fixed, scrap the vehicle, new parts and all. Easiest and first thing to do is check the fuel pump fuse.
I have one too. I replaced the catalytic converter and still happened. I found out that when the EGR is replaced, you should also replace the fuel distributor. It is also under the intack manafold. Not the ingniton distributor. After that, it never happend again.
If your problem EGR Valve is AC-Delco, it can be cleaned and will work like new and save you the cost of buying a new one. Also, I was told by a local auto-repair shop that EGR Valves have a LIFETIME Warranty... so if you have your receipt take it back for free replacement. If having to purchase a new one, Save Your Receipt. If your problem EGR Valve is aftermarket, replace it with a new AC-Delco. Aftermarket EGR Valves are crap and cleaning will not fix the problem. Same with fuel pump... install AC-Delco ONLY. 1995 Chevy Blazer 4.3
I own a shop, and a 4.3 V-6 blazer (94) that did the very same thing as yours. I started running nothing but 93 octane Amoco, or BP gasoline, and the problem has went away. The funny thing is; the gas cost more, but since I run this gas I get much more gas mileage now, so it more than makes up for the difference. I also run STP fuel injector cleaner in it every 3rd tank of gas, and put it in at 3/4 of a tank. Don't use the STP in the white bottle as it is crap! Use the one in the black bottle. You will tell a difference right away. It is important to change the PVC valve every time you change the oil filter, as this will cause it too. My Blazer cranks out about 30 miles per. gallon, and about 20 around town, so it's easy to see the difference. Advance Auto Parts carries a new gasket for the EGR valve that has a screen in it, and that too will help the problem. It might even fix the problem, I'm not sure but it is supposed to stop the problem. Go to their website and look it up. It will be in the listing with the EGR valve. I think it's made by Tomco, but not positive. Glad to help out, good Luck!!!
