Skip the auto shop - Our mechanics make house calls

Q: Misfire on coil one and two

asked by on

I've taken my vehicle to a mechanic and he came back and said the spark plug is badly damaged and needs to be replaced along with two coils. Is getting the two coils replaced necessary as the spark plug is badly damaged which may cause a misfire? Before I went to the repair show I taken the vehicle to Advance Auto for free diagnostics they said misfire on coil 1 and coil 2 and possibly spark plug. When I told the repair shop they said they need to look for themselves and charged me $112 for a Diagnostics and said the same thing I just told them. I don't want to be cheated out of my money. So the real question is. Can a bad spark plug cause coils to also misfire? In this case my one and two coils

My car has 120996 miles.
My car has an automatic transmission.

It is possible that the coils were damaged by the bad plugs. The spark output of the coils may be bad on the two cylinders in question. If you want to chance it and only replace the spark plugs then go ahead. If the misfire is still happening then you will pay for labor to replace the coils again.

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: Okay so basically my car shakes and vibrates a lot while idle or at a stop light. And then when I go above 65 rides rough

The rough idle may be caused by a variety of things, but this happens most commonly when the mass air flow sensor or the idle air control module have failed. The mass air flow sensor is responsible for monitoring the...

Q: Ground strap firewall to ? Can I cut and put new strap where I can reach

There are a number of ways to resolve this issue. The first of which is to trace the wire until you find the other end and replace the wire with the OEM part. You could also try to simply attatch...

Q: I have a 1999 I have this loud hum noise and it happens when you go a long distance. Then you stop while it happen it will stall

Hi there. If the humming sound is coming from your vehicle while it’s in gear, then the likely source is the transmission. It is possible that CV joints or wheel bearings might also be the source of your problem, but...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...