Skip the auto shop - Our mechanics make house calls

Q: New spark plugs not working

asked by on

I just replaced the spark plugs on my car. I removed the old ones, and installed the new ones. The first couple times that I started the car, it worked fine. I ran the car for about a minute each time. But then I tried again and the car didn't start. I removed the plugs, and it looks like they are blackened and covered with carbon. The old plugs didn't look like that; just worn. Does the ECU need to adjust to the new plugs, or did I do something incorrectly?

A: Check to ensure that you installed the corr...

Check to ensure that you installed the correct spark plugs and they match the ones you took out. The new replacement plugs should be iridium type and will last up to 100000 miles. If you put in the incorrect plugs, then this may cause the problem you are having. Otherwise you could have left something loose like the mass air sensor or inlet air tube while running the engine. If the engine is running rich enough to blacken the spark plugs it would set a code for a problem. A certified mobile mechanic from YourMechanic can come to your home or office to diagnose why your car is stalling.

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: Convertible top doesn't close properly

Hi. The convertible top has to be reset so it is synchronized to all of its upper and lower limits. If this procedure does not work, then the top position switch may need to be replaced or adjusted. I recommend...

Q: Brake malfunction dynamic drive on 2005 BMW 745Li

Hello. It sounds like your 2005 BMW 745Li may have a problem with your electric/charging system or that the battery is faulty. If the electric/charging system is charging too low, it will cause the electronics to go “haywire” because the...

Q: Interior lights are not working

The most likely cause of this issue would be a short to ground somewhere in the interior lighting system. If a wire has too much metal exposed and it is coming in contact with the vehicle's chassis, excess amperage is...

Related articles

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...
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...