Skip the auto shop - Our mechanics make house calls

Q: Car shaking and misfiring

asked by on

My car is shaking. The mechanic I took it to said it was misfiring. I had the spark plugs changed and now it is driving worse than it was before.

A: Hi. The first thing to do is check the code...

Hi. The first thing to do is check the codes stored in the engine computer. If the engine is indeed misfiring, codes will be stored. The source of the misfire will need to be identified, possible faults include a failing fuel injector, ignition coil, engine computer, etc. However, there are quite a few TSB’s (Technical Service Bulletins) that address a whole host of power/drivability issues stating updated software for both the engine computer and transmission computer. Incorrect fuel maps before and after turbo kicks in or faulty torque converter lockup logic maps may be the cause of your concerns. You may want to enlist the help of a mechanic, like one from YourMechanic, to read out faults and diagnose the misfiring issue your vehicle is encountering.

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: My 95 Honda Civic is only running on 3 cylinders.

Any time you have a misfiring cylinder the easiest thing to do is to replace the spark plugs and check the plug wires to see if valve cover leaks oil onto plug wires in spark plug holes. If it does...

Q: p0171, back fires at idle, lack of power and red hot catalytic conterter?

The P0171 trouble code relates to a "lean condition" and applies generally to many makes and models of cars. This simply means the air/fuel mixture is lean meaning that there is too much oxygen present in relation to the amount...

Q: Filter housing blew off the engine and leaks

What may have happened is that, the last time you had your oil changed, the filter may have been installed improperly causing an increase in oil pressure. This increase in oil pressure may have been what caused the filter housing...

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...
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...
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...