Q: Our 1995 Isuzu Rodeo has black smoke from the tail pipe and it is chugging and we think it is the oxygen sensors. Could it be something else?

asked by on December 27, 2016

Our 1995 Isuzu Rodeo is chugging an black smoke comes out on exceleration. We just had a tune up and the guy said the black smoke would clear in a few days when the oil burned off, it got worse. Could it be the oxygen sensors or mybe the catalytic converter? I hope its the sensors, they are cheaper.

My car has 145000 miles.
My car has an automatic transmission.

Hi there. There could be an issue with the fuel injectors, fuel pressure regulator, or the spark plugs. Check the spark plugs and see if they are wet with fuel. Black smoke is a sign of excessive burning fuel. Check the fuel injectors for any of the leaking or the fuel pressure regulator for the pressure on the fuel rail. The pressure on the fuel rail would need to be no more than 65 psi. If the pressure is more, then the fuel pressure regulator may be malfunctioning. If the spark plugs are wet with fuel, then either the plug is fouled out, the ignition coil is not working, or the fuel injector is leaking. If you need further assistance with excessive black smoke, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Hesitation at RPMs lower than 2000

The vehicle may have unmetered air entering the engine, which is air entering the tubes between the mass airflow sensor and the throttle body. If there are no leaks, then the fuel trims in the data would need to be...

Fuel gauge acting erratically

It's possible that you have a problem with your fuel gauge. The only way to tell is to pull the fuel pump out and check resistance on the sending unit. I would suggest having a certified technician come out and...

No fuel pressure in my line. Car won't start. When it did star, it died and now won't start at all.

As you know, this may be a result of a faulty fuel pump. This may also be a result of a failing fuel pressure regulator as well. This is what monitors the fuel pressure in the system and maintains pressure...

Related articles

How to Replace a Fuel Rail Sensor
The fuel system has a fuel rail sensor which fails when the engine operates erratically, has difficulty starting, or the Check Engine Light comes on.
Does Gasoline Expire?
Gasoline Gasoline does expire if it is left unused for a long period of time. The problem with gas is its volatility. A volatile substance is prone to separating and vaporizing. This is especially bad if the fuel vapor has...
What Does the Mass Airflow Sensor Do?
How How often does the mass airflow sensor need to be replaced? Mass airflow sensors (MAF) have no expiration date. They are not included on the manufacturer’s scheduled maintenance list of things to replace based on mileage, like spark plugs...