Q: Q: Car running very rough

asked by on

My car is running very rough. I have tried Seafoam in the tank, but it hasn't helped. I might need new spark plugs.

A rough idle can be caused by many things. Injector problems, worn ignition components like spark plugs and wires, or vacuum leaks are all examples of things that can cause symptoms similar to what you are describing. Products like Seafoam are not really meant as a repair, but are more like a maintenance. Here is an example of what I mean: If you have a cavity, brushing your teeth more often wont fix the cavity. It needs to be filled, then you can brush your teeth more often to prevent it from happening again. This is what happens with products such as the one you used. If used as part of a maintenance to prevent they work fine, but they are not meant to correct already occurring conditions. I would suggest getting a mechanic, such as one from YourMechanic, to take a look your vehicle to determine the cause of the rough idle. Running a car with a misfire can damage the catalytic converters making the repair more expensive in the long run.

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. Q: Car running very rough

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: Can I have my jump starter plugged in to an outlet as if i was charging, then connect it to a batter and turn it on? Will that cha

If the vehicle battery happens to be more than 5 years (60 months) old, don't bother fooling with it. Buy a new battery and be sure the new battery is fully charged by the store before you install it, otherwise...

Q: Car blowing cold on one side, hot on the other

That sounds about right. There have been a lot of cases with faulty actuators. They are computer controlled. If a code is set, they will default to a set position, or it's stuck. The blend door itself could be stuck...

Q: My theft system is keeping my car from starting in my 1994 Cadillac Deville

Hello. If the theft light is coming on then it is causing the vehicle not to start. Most of the time the issue is caused by either the key failing or the key sensor located in the key lock cylinder....

Related articles

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...
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.