Too much transmission fluid symptoms/ how to check A/T fluid level without a dipstick

  Transmission fluid is the lifeblood of transmission. It ensures the smooth running of the engine and keeps the   transmission temperature   down since gear usually generates alot of heat. but what happens if you put too much fluid in the transmission? What are the signs of an overfilled automatic transmission? leakage of transmission seals puddles of transmission fluid underneath the vehicle foamy transmission oil transmission overheating  failure to shift properly, causing a jerking sensation what are the consequences of an overfilled automatic transmission? oil starvation  reduced lubrication reduced cooling increased frictions damage to parts damage to seals increased wear what are the signs of overfilled manual transmission? leakage of transmission seals puddles of transmission oil underneath the vehicle puddles of transmission oil inside the vehicle foamy transmission oil  tansmission overheating clutch chatter or slipping when applying the clutch difficulty pushing in the clutc

Eight things that cause black smoke from your car's engine

Engine of a car will exhaust a product of combustion, which, if all things being equal are steam and carbon dioxide.

Steam (H2O) and Carbon IV Oxide (CO2) are the product of combustion with traces of oxides of nitrogen and hydro-carbons in car's engine

Some of the unburnt fuel particles, will be exhausted as hydro-carbons, and excessive heat of the Engine will convert some of the available oxygen meant for combustion into various nitrogen oxides. Which, if present  in excess is harmful to our lives and the environment. 

Because of this, there is a legislation in the industrial countries on the amount of each of these substances to exhaust from any Engine that's built to work on public roads.

Car Engine manufacturers want to stay in business, and also want to obey the laws of the land. They started building Engines with devices that will help ensuring a near complete combustion to limit the excess hydro-carbons to the environment and also inhibitors that will limit the temperature of an engine to avoid oxides of nitrogen formation.

The modern Engine, from the late 1996 model till present mostly have the following parts, towards ensuring optimal performance of the Engine with environmental safety in mind:
  1. Air filter
  2. Airflow meter
  3. Oxygen sensor
  4. Catalytic converters
  5. EGR valve
  6. Injectors
  7. PCM or brain box
Each of the above parts is specially designed to play a special role towards a complete burning of fuel by ensuring the needed air/fuel ratio.

When a malfunction occurs with each of those parts, it'll affect the mixture ratio of air and fuel, which will consequently lead to excess fuel supply without equal amount of air being available for a complete burning. 

This'll cause some fuel to remain unburnt, form a soot and exhausted out of tailpipe in the form of black smoke.

Now you'll learn how each of the failure of the above listed parts will result to black smoke from tailpipe. 
You'll also learn how you'll quick rectify it to get the vehicle back to work safely.

Let's read on

Air Filter

Air filter is built to clean the dust from the oxygen needed to mix with  fuel for a complete burning. If blocked,  squeezed due to long usage, it'll stop supplying enough oxygen to the combustion chamber
This will make the fuel supplied to remain unburnt and exhausted as black smoke.

Always make sure you replace your air filter every time you're doing  regular oil and filter changes.

Airflow meter

Air flow meter or sensor measures the amount of available oxygen and report to PCM, to determine the equivalent fuel needed for a complete burning.
It'll start malfunctioning if covered by dust or oil. 
Bad airflow meter will prompt a PCM to supply more fuel even when there's not enough oxygen. This will leave some fuel parts unburnt and exhaust as a black smoke from tailpipe.
Use a special carburetor cleaner to remove the dust particle from it or have it replaced if it can't be cleaned.

Oxygen Sensor

Oxygen sensor unlike the airflow meter is at the exhaust line of an engine. It  acts as the nose of the PCM, that'll sniff the available oxygen in the exhaust gas. Click here to read more about oxygen sensor.

Based on report from the the sensor, the PCM will adjust the next air/fuel ratio needed for a complete burning.
Oxygen sensors are installed in set of two, before and after catalytic converter.

The first one above the catalyst is aimed at measuring the available oxygen in the exhaust gas and send the information to the PCM. This information will let the PCM knows if the combustion is with excess oxygen or with excess fuel, to determine how it'll adjust the next mixture ratio for a better result.

The second sensor is installed after catalytic converter, to detect after the catalyst have neutralized the exhaust product of the harmful substance, how much oxygen still remains in the exhaust. Sending this results help better the adjustment of the PCM. The PCM's work is aimed at bringing 14.7 parts of air to 1 part of fuel for a complete combustion.

Oxygen sensor's aim is strictly for emission control but its malfunction will suffer your Engine, you'll spend more money on fuel than usual and your vehicle will embarrass you with black smoke.

Catalytic converter

Catalytic converter is built for emission control.  It converts the unburnt hydro-carbons into the harmless carbon dioxide and steam. And the reduction catalyst converts oxides of nitrogen to carbon dioxide and nitrogen gas.
For a full discussion on the how catalyst works, click here

Catalysts can become affected by leaded fuel, coolant leaks from a bad head gasket, excessive overheating, and oil leaks from a broken valve.

Also, road debris and curb can physically damage your catalysts. This will make your engine performing sluggishly. In a worst scenario, it could lead to Total Engine shutdown. Some common symptoms of a bad catalyst are:

  • Sluggish  engine performance.
  • Reduced acceleration.
  • Dark exhaust smoke.
  • The smell of sulfur or rotten eggs from the exhaust.
  • Excessive heat under the vehicle

Careful attention to your check engine light will safe you from a costly repair work that'll involve replacing your catalysts. When your check engine light is blinking, it's a sign of serious situation that may eventually destroy your engine's catalytic converter.  Diagnose and have your check engine light repaired immediately it illuminated in your combination meter.

EGR Valve

Exhaust Gas Recirculation is to minimize the formation of oxides of nitrogen by lowering the temperature of the combustion chamber.

Part of the exhaust is channelled back to the combustion chamber. This action is aimed at raising the engine combustible power and minimizing exhaust.

When there is a problem to the valve, whether it's stuck opened or closed, engine will begin to malfunction, sometimes excessive black smoke will exhaust.


Injector Nozzles are specifically made to produce fine spray for atomization of fuel.  When there is a blockage to those fine holes, it'll start dropping excess fuel, instead of spraying. This will leave part of the fuel unburnt, exhausted as black smoke.
You can Service the injectors or replace it.

Brain Box

A brain box or your car's ECU, works with all the various sensors of the engine. It receives signals from one sensor, then instruct another sensor to perform action of some kind.
Its malfunction is dangerous atimes to the Engine. The bad brain box can trigger the excessive supply of fuel into the combustion chamber and excessive black smoke will be exhausted.

When a brain box begins to malfunction, replace it.

Knock sensor

This is attached to the body of the block Engine or cylinder head to sense the vibration of the Engine to  detect the knocking attempts of the Engine.  It'll instruct the ECU to retard the ignition timing based the the detected vibration.
When it's not Earth well, or it's malfunctioning, the car will exhaust excessive black smoke.
Check to see that it's mounted correctly or replace it.

Drop a comment Below if your Engine is malfunctioning , or giving out a black smoke, let's solve it together.


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