New Holland Tractor Blowing Black Smoke? Causes and Fixes

Black smoke means the engine is burning more fuel than the air supply can handle. On a New Holland tractor, the cause is usually one of a few things.

Common causes

1. Dirty air filter. Too little air makes the mixture too rich. Check this first, because it is cheap and quick.
2. Worn or leaking injectors. Damaged nozzles spray too much fuel or a poor pattern.
3. Injection pump worn or out of timing. The pump may be delivering too much fuel or delivering it at the wrong time.
4. Turbocharger problems. A weak turbo cannot supply enough air under load.
5. Overloading. Working the tractor harder than its rating can cause smoke under load, even when the engine is healthy.

How to narrow it down

If the smoke appears only under heavy load, look at air supply and the turbo. If it is constant, injectors and the pump move higher on the list.

Do not ignore it

Running rich washes oil from the cylinder walls, wastes fuel and can shorten engine life.

See our New Holland parts page.