Once in awhile, after starting my truck and accelerating, it blows out black smoke. Why is this?

Answer 1

Your engine is running rich, too much fuel. If it is only when you have first started the truck it may just be the "Choke" is still closed on a carburetor engine or a sign of engine controls in "open loop" in a later model fuel injected engine.
But, It is fuel.

Oil would be white smoke.


Yous: Grumpy

Answer 2

It may mean that your piston rings are leaking some oil into the compression section of the engine.

You can confirm this is the problem by doing the following:

After the truck is warmed up, while driving at normal speed, let up on the accelerator and glide for a few seconds. Then step down on the accelerator. If black smoke also comes out then, you need a ring job before your engine gets worse.

Answer 3

Black smoke would indicate an overly rich fuel mixture due to a leaking fuel injector or other fuel control problem. This is bad for your catalytic converter, so you need to get it fixed.

Answer 4

Maybe its burning oil

Answer 5

It is running too rich.

Meaning you have more gas in your mixture of gas and air than you should have.

Answer 6

it's over-loaded with gas
unless this is a diesel you may have a bad injector

Answer 7

You have oil leaaking. you neeed to have it cheeked or you will not have your truck running

Answer 8

thats ez its either ur transmission or u might have a leak

Answer 9

could be burning oil

Answer 10

it gets too much gas......... quit pressing the gas pedal so hard