Skip the auto shop - Our mechanics make house calls

Q: CEL on after spark plugs replaced

asked by on

I was notified that I had a valve gasket cover leak, as my car was severely leaking oil. I had this replaced as well as the spark plugs replaced. This is been about 5 days ago. I was told to add some engine treatment, which I did. Now the car jumps badly when I reach about 20 mph, after that the jumping stops. Also, the check engine light is on, which it was NOT before. My anatomy knowledge of my car is extremely limited. Also, there is a rough idle. Where do I begin?

My car has 158000 miles.
My car has an automatic transmission.

A: The first task is to find out what problem ...

The first task is to find out what problem code is causing the Check Engine light to come on. Most auto parts stores will plug in a code reader for free (on a time-available basis) and tell you what code(s) are set.

The leaking valve cover gasket will have allowed oil to get onto the old plugs and plug wires, possibly damaging the spark plug wire boots. This is likely causing the misfiring you notice at lower speeds.

I would recommend having YourMechanic diagnose this issue, provide an accurate assessment of damage, and estimate the cost of repairs. One of our mobile and professional mechanic can come to your location for the diagnosis of your Check Engine Light and repair your vehicle as necessary.

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: No power, car sounds very rough.

The first place to start when trying to diagnose a vehicle with running issues is to have it scanned for diagnostic troubleshooting codes. This will tell you if any sensors have detected any issues, and may give you some more...

Q: White smoke expelled from exhaust

The excessive fuel condition is from the exhaust regeneration system malfunctioning and should be diagnosed following updated diagnostic procedures for the check engine codes received. Follow technical service bulletin 09-10-02 for an updated procedures directive.

Q: Air conditioner making noise

You have an A/C leak. Dye needs to be added to the system, and the system needs to be recharged. Pressure gauges need to be attached to verify proper A/C system operation. You may also have a compressor issue that...

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...