Skip the auto shop - Our mechanics make house calls

Q: Car misfire

asked by on

Do all 4 engine coils have to be the exact same shape? I've got 1 of 4 that isnt the same as the other 3.

A: They do not need to be replaced and be in t...

They do not need to be replaced and be in the same shape but it sometimes is recommended to replace all of the coils at the same time since they seem to start failing one after the other in a short period of time.

A mechanic may recommend all 4 so you will not have another one fail a month from now and then another 3 months out and so on. When you replace all 4 you will have good strong spark on all coils instead of great on one and okay on the others.

The engine may run a little rough from one strong coil and 3 okay ones. It will be like replacing only 1 tire at a time. You will never have 4 new tires replacing only one at a time.

If you need to get them serviced, consider YourMechanic, as a certified technician can come diagnose your misfire and replace your remaining ignition coils if necessary. Good luck.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: White smoke and a knocking sound after fixing the diesel pump problem

Hello, thanks for writing in about your Toyota. If you are getting white smoke and a knocking sound it is most likely coming from the engine fuel injection. It's either out of timing or flooding the engine with too much...

Q: Car misfires

Misfires are common and can be caused by things like bad spark plugs, spark plug wires, coils, bad injectors, or low compression. When the ECM detects a misfire, a code is usually set. A qualified mechanic, such as one from...

Q: Excessive oil consumption, oil in spark plug holes, normal compression

The oil getting into the spark plug holes is from the valve cover and spark plug tube seals. Replace both of these and clean out spark plug holes of oil. This will help with the misfires and coils shorting out....

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...