Skip the auto shop - Our mechanics make house calls

Q: Car shudders after spark plug replacement

asked by on

I had the spark plugs on my car replaced with the OEM motorcraft ones. Ever since I did this, the car has been shuddering. Also, the AC stopped blowing cold air. What could be wrong?

Hey there, thanks for writing in about your 2009 Ford Flex. If you had the problem only after the spark plugs were replaced, then you may have damaged one of the plugs when you put it in. If Check Engine Light comes on, then you may have misfire. The A/C should be checked to see if a wire got disconnected during the work you have done. If you want to have this looked at, a certified professional from YourMechanic can inspect the shuddering issue and let you know what needs to 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!
  1. Home
  2. Questions
  3. Car shudders after spark plug replacement

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 a thermostat cause elictric fans not working?

Hi William. Thanks for submitting your question tonight. If the thermostat is not functioning correctly, the repairs to the cooling fan are pretty much useless. Beyond the items you've listed, there are three specific things I'd check. First, it's quite...

Q: Where is the AC Compressor Control Relay on a 2001 Chevy Malibu located?

The A/C control relay is in the "Fuse Relay Center" which looks like a black plastic box in the under hood area. The relay may be a micro relay and will be labeled "AC Clutch". If you have a non...

Q: My altima will not start.

Hi there. It is quite possible that the ignition button has an electrical fault or the fuse that powers the switch is damaged. It is also possible that the ignition relay is damaged. I would recommend having a professional mobile...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.