How do you or can you remove the carbon build up on a 1995 gmc jimmy I removed the erg valve and it was full of carbon how can you do more from other areas that has built up?
I had a 97 Jimmy with a similar 4.3 Vortec under the hood that you might have 8/10 chances for that year. If you just bought the vehicle and discovered this, you might have had a previous owner that drove the vehicle with low acceleration which caused the high amount of blowby in the PCV and the carbon deposits slowly and coolly being left along your exhaust system. One way is to get a fresh oil change (thicker is better in summer), and drive the vehicle hard. I’m not saying to break the law as that is not something one should do. I’m just saying you can accelerate in such a way that you can maximize some hot air pressure going through the system for a week or so. This usually does get rid of built up carbon in the air exhaust system.
