Skip the auto shop - Our mechanics make house calls

Q: Misfiring - 2010 Chevrolet Cobalt

asked by on

Changed spark plugs and still has miss fire. Old plugs were black

My car has 88000 miles.
My car has a manual transmission.

A: A misfire can be caused for several reasons...

A misfire can be caused for several reasons such as bad plugs (which you have fixed), detonation (bad timing), bad ignition coil, vacuum leak, faulty fuel injectors, low fuel pressure or faulty spark plug wires to name a few. This may require some specific diagnosis that will require the computer in your car to be scanned for fault codes which will indicate specifically what the issue is. If you need further guidance on this, a certified professional from YourMechanic can diagnose the misfire issue firsthand and assist with a repair.

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: Cylinder 2 misfire

Engine misfires can be caused by a list of problems, but there are a few suspects that occur more than others. Generally, misfires are caused by either a spark or fuel issue or in cases, a combination of both. Spark...

Q: Charging system failure.

Hi There, You may have a failing voltage regulator that could be allowing the alternator to supply too much or too little amperage to the battery resulting in the battery never maintaining a consistent charge as it is designed to....

Q: slow take off, 1996 Mercedes C220

This could be a variety of issues relating to timing, fuel delivery, or another sensor related issue. I would suggest having an expert diagnose the vehicle with a scanning tool, which will download trouble codes from the car's computer in...

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...
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...