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: Massive vibration after 40 mph or once I go from 4th to 5th gear.

Hi Darryl. Thanks for contacting us today. Generally speaking, a single cylinder misfire will gradually create a steady vibration, but not stop when you're accelerating. The type of vibration you're describing is often caused by a transmission or engine mount,...

Q: Reverse, courtesy, & license plate lights are out

Its very possible there is a ground issue as the only thing in common with all of these lights is ground G402.The ground wires meet up at a splice point prior to the ground point. To verify this, a voltage...

Q: Hey I have a 2000 Cadillac deville and about two weeks ago it started accelerating slow so with the car running I checked the tran

The issue is much more likely to be engine related and, if so, can be diagnosed readily by a mobile mechanic with an appropriate real time scanner. With regard to the transmission filter, if the filter were clogged enough to...

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 to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...