Q: My car is having a missfire and not burning the gas wat can it be

asked by on December 05, 2017

I recently took in my car for the smoke test and they told me that it's passing gas wit out burning it and it had a missfire any ideas wat can it be

My car has 168000 miles.
My car has an automatic transmission.

This may mean you are running too rich and will need to have the engine O2 sensor and mass air flow checked to see if they are causing the engine to run too rich. i recommend having a mechanic like one from YourMechanic to check the computer and engine for tune up needed and any other repairs that can cause the problem.

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

The car cut off
Hello. The car model will help us narrow down what to look for. Are there any lights that turn on on the dash when starting the car? Do any interior lights turn on? If nothing turns on, there is an...
Loose gearshift
The gear shift on your vehicle is connected to the transmission via a cable. If the shifter is loose and will not shift the vehicle into the different gears, the cable might be faulty. If it is shifting fine, just...
Dash lights show doors open and trunk only opens with key button
Sounds like the rear electronic control module (ECM) is failing (https://www.yourmechanic.com/admin/advice/edit/1579). This prevents the determination if the rear doors are closed, and also controls all of the trunk electronics. You can try a used ECM, but the hardware number and...
Fuel Rail System Error Code
Considering that the code is related to a problem in the fuel system, you should leave it to the professionals to avoid personal injury. When fueling the car, check twice to make sure the fuel cap is fastened properly. Low...
Wierd rpm spike when coasting in vehicle.
Your car has an automatic transmission (https://www.yourmechanic.com/article/how-an-automatic-transmission-works) and will automatically downshift as the speed of the vehicle slows down. This spike in RPM's is just the downward gear spinning the motor up slightly as it downshifts. Nothing to worry about...
Leaking coolant and coolant jug has to be filled every other day
There are more than five different coolant hoses on your Mitsubishi Montero that may be causing the coolant leak. Without being there to physically inspect the vehicle, it's hard to diagnose precisely which one is causing the leak (https://www.yourmechanic.com/article/how-to-find-the-source-of-an-oil-leak-by-ed-ruelas). The...
We have a 1993 for f250 with a 7.3 idi we have now replaced the water pump thermostat radiator and its still over heating what could
Hello. Overheating can be caused by many things. If you have replaced those cooling system components and the issues continue then there is likely a more serious issue with the engine that is causing the overheating. If the engine overheated...
2013 Town and Country intermittently won't start
Hi there: There could be multiple reasons why your Town & Country is hard to start, ranging from ignition relay issues to a problem to the crankshaft position sensor or other electrical components. One of our mobile mechanics can come...
I think my car battery died, but im not sure.
Hi there. It seems that the security system has came on and lock out your vehicle from starting. If you open the door and the dome light comes on with a good solid light and the headlights work, then the...

Related articles

The Best Used Cars to Buy If You’re Shorter Than Average
Vertically Vertically challenged? Hate getting behind the wheel and having to crane your neck to see? There’s nothing wrong with you, but there is something wrong with your car. It might be time to trade it in and take advantage...
Symptoms of a Bad or Failing Valve Cover Gasket
Common signs of a faulty gasket include a burning oil smell, dirty valve cover, oil leaks, low engine oil, and a rough-running engine that misfires.
The Top 5 Selling Cars in California in 2012
California California natives are notably environmentally conscious, and this often shows in their choices of vehicles as well. While trucks rarely make it to the top spots, hybrid vehicles are frequently on the list. Though previous years have seen the...