Q: Two misfire's and it smokes because of it. Also bogs down when giving it gas.

asked by on January 14, 2017

The car has 2 miss fires put it on the computer and it shows misfire no bad plugs also bogs down while accelerating
My car has an automatic transmission.

Spark Plugs Replacement $113.11 - $716.47 Get a Quote
Fuel Injector Replacement $400.56 - $3968.30 Get a Quote
Engine is misfiring Inspection $94.99 - $114.99 Get a Quote

Hi there. Check the spark plugs and see if they have any burn marks. If the plugs are good, then check the fuel system for proper fuel pressure and see if the injectors are working. If there is a misfire, then the engine light should be on with a code. Check the codes with a portable scanner to determine which cylinders are misfiring. If the spark plugs and fuel injectors are good, then there could be a more serious issue with the engine like a burned valve, sticking piston rings, or a hole in the piston. To verify this condition, check the compression on all of the cylinders and compare them to each other. If the cylinders that are misfiring have a lower compression than the other cylinders, then there is an internal issue that needs to be repaired. If all of the cylinders are good and strong in pressures, then the issue lies within the spark plugs and fuel injectors. If you need further assistance with a misfire, then seek out a professional, such as one from Your Mechanic, to help you.

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I view the average fuel consumption?
The average fuel consumption feature is displayed on the multi-information display, and shows you the fuel economy that your car has achieved since the last reset of the feature. To view the average fuel consumption, press the display button on...
seatbelt won't release
Hello. I am not aware of any way that you could unlatch the seat belt without damaging it. You may be able to forcibly unlatch the seat belt and have it work properly afterwards, but this is no guarantee. The...
the timing chain is making noise at startup what needs to be replaced to fix the problem?
There are many reports about this issue with your truck. I have access to IATN (International Automotive Technicians Network) and the consensus is everything on the front of the motor needs to be replaced. Which is a very, very large...
The high temperature cooling fan keeps coming on when the car is in park or driving. The temp rises until I start driving then it decreases.
This could reflect a circumstance where the radiator has slowly developed a partial blockage over time due to sediment and corrosion. Other possibilities include a defective radiator cap and partially collapsed radiator hose (typically lower). It is possible for a...
What is the price range to reset and/or reprogram the computer?
Billing question was sent to CS for the cost to reset or reprogram a ECM (computer) for a 2008 Volvo S80 with a L6-3.0L turbo engine.
Starting trouble
Hi There, It sounds like you have a weak battery (https://www.yourmechanic.com/services/battery-replacement). If the lights dim when you turn the key to start the motor, this suggests that the battery simply does not have the proper cranking power to turn the...
Car brakes are stuck on.
Try putting the transmission shifter in park or neutral and see if the brake pedal becomes unstuck. If not, then you may have to remove the battery cables to reset the electrical system so that the parking assist is shut...
2014 lincoln mkz 3.7L When slowing down it gives a bit of a sputter type jerk .. when on the Freeway went to merge gave it has an
If your vehicle is turbo equipped, you might notice a hesitation on acceleration under certain conditions. As far as the sputtering is concerned, that is an engine controls issue that would have to be looked into. The air fuel ratio...
I am having trouble starting my 2007 Dodge Charger and it does not have good acceleration
Hello. There are a lot of things that can cause this on your vehicle. I would usually start by scanning the computer for any codes. If there are codes set it can help to find the issue. If there are...

Related articles

What Does Ignition Timing Mean?
Timing Timing – it has a couple of different meanings when applied to your car’s engine. One of the most critical is ignition timing (not to be confused with engine timing). Ignition timing refers to when spark is created during...
Symptoms of a Bad or Failing Fuel Filler Neck
Common signs include a fuel smell coming from the car, the Check Engine Light coming on, and fuel leaks.
How to Flush a Fuel Injector
Clean fuel injectors help keep your engine running smoothly and efficiently. Clogged fuel injectors result in reduced fuel economy and loss of power.