Q: My car is emitting black smoke and has poor acceleration

asked by on

My car jerked real hard months ago when i put it in drive, i heard a loud clunk. Ever since then, i have had sluggish acceleration when taking off. Recently, i noticed when i push on the gas, black smoke comes out of my exhaust pipe, it doesnt come out while driving, just when i push on the gas.The acceleration is still weak. Also, if i drive it for more than 30-45 mins (usually on a hot summer day) the temperature gauge goes up and drops. But it doesnt always drop, it sometimes stays up there. Please help me figure out whats wrong with my car. Im getting more spark plugs and wires installed soon, hoping that will solve something.

My car has 129947 miles.
My car has an automatic transmission.

Hi There, Black smoke coming from the exhaust is usually an indication of a rich fuel condition. When this happens, this can be the result of many things such as faulty fuel injectors, a failing mass air flow sensor or a faulty fuel pressure regulator allowing too much fuel to be supplied to the combustion chamber to be burnt. When this happens the result is an excess amount of unburnt fuel being passed through the exhaust coming out in the form of black smoke.

Your issue regarding the temperature gauge seems to indicate you have a faulty thermostat. The thermostat regulates the flow of the coolant in your car’s engine and controls when the coolant flows in and out of the motor from the radiator by opening and closing at specific temperatures. When your thermostat is not working properly or is stuck closed, this will not allow the coolant to properly circulate through the engine, which may cause the engine temperature to fluctuate erratically or in some cases just remain hot. When the thermostat is stuck open it can cause the coolant to circulate constantly resulting in the motor never reaching the correct operating temperature. I would recommend having an expert from Your Mechanic come to your home to diagnose your vehicle.

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
  1. Home
  2. Questions
  3. My car is emitting black smoke and has poor acceleration

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

Q: Car runs hot and doesnt keep coolant

Hi there. Most of the time, overheating issues are caused by a radiator leak, leak in the coolant lines, or a failed thermostat. The worse case scenario is that you'd have a blown head gasket. However, if you're seeing...

Q: I have a severe engine coolant leak

Hello, the overheating issue needs to be fix as soon as possible, the vehicle should not be operated or you can damage the engine. An overall inspection of coolant system components needs to be done. Some visuals may have to...

Q: Replaced many items, but the car still doesn't start

Back away from the parts cannon. Just kidding, but on a serious note that sounds like alot of unnecessary parts have been replaced. Why don't you let a mechanic take a look at it for you? We all believe in...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...