Black Smoke

[AmeriStar]

Jim,
The DDEC will assume that the air filter element is clean at idle. It adjusts only after it has received a power demand command. A momentary delayed inital adjustment period is standard. If the air filter element was installed improperly ( not fully unwrapped, foreign object in the cylinder) would explain a momentary shot of black smoke. Consistant black smoke is either bad fuel, misfireing injector or low compression.

[JIM CHALOUPKA]

Just got my coach back after having some work performed including engine service(replace oil/fuel filters change engine oil)on my series 60. When starting out from a stop it is blowing a good quantity of black smoke that slowly dissipates as the rpm come in. Boost seems normal....any thoughts ?

Granvil, do you have a conclusion to report?

JIM

[grantracy]

Yes, according to Detroit Diesel (down here) it was the injectors,which they recommended I replace,which I did. Because the labor involved to get at the top end they suggested replacing all. While torn apart they discovered that parts of the engine brake were broken which was also fixed. Jake brake actually works now and I also feel like I'm producing a little more torque/power or it could be because my pocketbook is so much lighter. And no more smoke.