Q: If cylinder 3 misfires is that a bad thing?

asked by on

I brought this car to get a diagnostic test. It stated that cylinder 3 misfired and that the catalyst is damaging. Is this bad and expensive?
My car has an automatic transmission.

Hi there. A misfiring cylinder can be expensive if allowed to continue. The catalytic converter can be damaged. If the cylinder is misfiring, the coil, wire, and/or spark plug could be the cause. First swap the spark plug between cylinder 3 and one of the other cylinders. Make sure to note which ones you swapped. Check to see if the misfire moves from cylinder 3 to the other cylinder. If this is the case, then replace the spark plugs as the swapped plug is at fault.

If there is no change, then the wire or coil may be at fault. Wire and coil resistance can be checked with a digital volt/ohm meter and compared to specifications. If you would like to have a professional take a look, a certified technician from YourMechanic can come to your car’s location to diagnose the misfire and follow through with appropriate repairs.

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. If cylinder 3 misfires is that a bad thing?

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: codes p0101 and p0303 simultaneously

The code P0101 is for a problem with the MAF sensor and code P0303 is for a cylinder number 3 misfire. The first thing to check is to make sure there is no vacuum leaks or leaks between the MAF...

Q: Q: Rough idle and RPM fluctuation

This may be a sign of a faulty MAP sensor. The Manifold Absolute Pressure (MAP) sensor senses engine load and generates a signal that is proportional to the amount of vacuum in the intake manifold. The engine computer then uses...

Q: There a knocking noise in motor

Without more information, if will not be possible to determine the cause of your concern. There are many moving parts in an engine and any one of them can cause noise. It could be a bearing going bad, piston slap,...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.