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Message: <blockquote data-quote="Tazza" data-source="post: 15771" data-attributes="member: 82">My first thought was air filter but as you changed that i would think your injectors may need attention. After you mentioned the soot that also sounds like injectors. Usually when they aren't rite you get like tiny balls of black soot out the exhaust. It may be a good idea to pull them and get them checked. I'm a little lazy and have pulled them and pulled them apart and cleaned, re-assembled and checked by hooking an injector to the pump with a tube line out the back. You can check the spray pattern. This will not tell you the cracking pressure or if the nozzle is leaking though.If you don't know what you are doing, it may be an idea to take it to a shop and get them to check them for you.You can do a simple go or no go test by removing the injectors, attach a tube line to the pump and hang it out the back, attach an injector and crank the engine till you get a spray. I'm assuming your engine is in-direct injection so your spray should be a narrow cone. It should be about 1' long and quite narrow. Don't put your hand near this! it can penetrate the skin. If the spray looks rite try the next 3. The spray should be even, without any stray spray (if that makes sense). Once you see it, you will understand. If its direct injection it should spray like a fan from the tip, almost like what you see on TV when someone shoots an automatic gun, they look like flower petals from around 6 or so points.It gives you somewhere to start at least, i personally would start with the injectors. Even a badly worn engine that isn't burning a lot of engine oil shouldn't smoke when warm and not under load. 9 times out of 10 its your fuel system, be it injectors or the pump.Do tell us how you go!</blockquote>

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