Question about 2000 Chevrolet 2500
Is this on a cold start??
I would assume it's the grid heaters cycling.
What is the RPM differential (high 7 low)
Or all starts??
Then your IP (injector pump) has probably sucked up some crud or maybe the lift pump isn't keeping the supply steady.
The MAF (if equipped) could be sticky too.
If you don't know when the injectors were last changed then they need to be changed. They are a wear item that can cause smoke and misfire.
Black smoke is the most common emitted from diesel engines and indicates incomplete combustion of the fuel. Black smoke causes can vary widely and include ..
· Incorrect fuel injection timing
· Dirty or worn fuel injectors
· Over fuelling
· Faulty turbocharger, or turbo lag
· Faulty or dirty exhaust gas recycling (EGR) system
· Incorrect valve clearance
· Incorrect fuel to air ratio
· Dirty or restricted air cleaner systems
· Over loading the engine
· Poor fuel quality
· Cool operating temperatures
· High altitude operation
· Excessive carbon build-up in combustion and exhaust spaces
Black smoke can occur across the entire operating range, but is usually worst under full power, or during the lag before the turbocharger boosts air supply to match the fuel usage such as in the early stages of acceleration and during gear changes. Moderate turbo lag smoke is acceptable; otherwise black smoke should be hardly visible in a correctly running engine.
My money is on the IP.
Check it out.
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Posted on Jul 20, 2009
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Posted on Jan 02, 2017
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