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・Save up to 30%

Get a quote

What others are asking

Q: Toyota Corolla vs. Scion IM

On that one, it's a toss-up. Toyota makes Scions. That was an experiment they had--"let's call these little cars Scions." They shut down Scion and now they are going to call all of them Toyotas. They are both good cars....

Q: Pinging sound a

Hey there, thanks for writing in about your 2012 Cadillac Escalade. A pinging noise is typically used to refer to spark knock or a damaged engine running condition. Did the Check Engine Light return with the same codes after doing...

Q: My automatic 2009 Jeep Wrangler shows 4 codes: P0562, P0306, C00377 & B2100.

Hi there, thanks for writing in. I would suggest replacing the battery first. A battery at 10V usually means one of the cells has failed. The P0306 code points out a misfire on cylinder 6. Since it is only one...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...