Q: The car is not firing. There is oil on the plug number 4

asked by on January 19, 2017

I started my car last weekend and drove it. After, about 5 minutes, it started jerking very badly and it wasn't firing. There was no fault indication on the screen. I have run a diagnostic test and it didn't reveal anything. My mechanic checked the plugs and discovered that the plug number 4 is soaked in oil and that cylinder isn't firing.. The vehicle is still jerking and that plug is still oil soaked. Even when we replaced the plug, it still had the same problem. My car has 18000 miles on the odometer. My car has an automatic transmission.

My car has 18000 miles.
My car has an automatic transmission.

Oil is leaking into spark plug well Inspection $94.99 - $114.99 Get a Quote

Oil on the spark plugs is never a good sign. if the oil is on the outside of the spark plug, you probably have a leaking valve cover seal. If the oil is on the inside (business side) of the spark plug the most likely origin for the oil would be bad piston rings or bad valve stem seals. If your car really only has 18000 miles on it, it may be covered by the manufacturers warranty. You will have to go to the dealer’s service department for that. If you don’t want to go in cold, you might want to have a technician check out your car and give you an opinion as to what is wrong. Contact Your Mechanic to have a technician come out to your home or office and check out your spark plug problem and render an opinion on what it will take to solve it.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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


Experienced Mechanic?

Earn up to $70/hr

What others are asking

How do I enable/disable the power door lock switch?
The power door lock Switch allows you to lock the doors from the inside of your truck. To enable or disable the power door lock switch, make sure all of the doors are shut. From there, to enable or disable...
Can I disable the automatic door lock?
The automatic door lock feature locks your car’s doors anytime you shift out of P (Park). This is an important safety feature, and it cannot be disabled.
After driving awhile, when idling, RPM drops below 500 & car stalls. Happens rarely but RPM fluctuates, and drops suddenly.
If you are having a stalling problem (https://www.yourmechanic.com/article/how-to-fix-a-stalling-car) then you may have a computer code stored in memory. I suggest having the computer scanned to see if there is any codes stored and diagnose them as needed. The intake hose...
Driver's seat no longer moves back when key is removed
I would go into your message center in your Lincoln MKZ to the settings menu. You can then scroll down until you find the feature that is labeled "Easy Exit". Once this feature is found, you should have the option...
it takes several times for car to actually start and wen it does start I put in reverse or drive and it quits y
Hi there. This sounds like most likely a transmission speed sensor problem. Your car has a sensor on the transmission that detects the car's gear ratio and relays this information to the car's computer. If the car has trouble starting...
Starting problem, engine revs at low RPM in drive - 1999 Chevrolet C3500
It sounds like the Idle Air Control valve (https://www.yourmechanic.com/services/idle-control-valve-replacement) is gunked up. It may be possible to clean it, or it might have to be replaced. A YourMechanic professional can help to diagnose the stalling issue (https://www.yourmechanic.com/services/car-is-stalling-inspection) and replace the...
My service light says service temp. What do I need to look for?
Hi there. A low coolant level can illuminate the service light and create the heating and AC problem you have described. Check the coolant level while the engine is cold and top it off as necessary. Also, look around the...
Car making loud whooping sound
Hi there. I believe that the puddle/start of the noise was simply a coincidence. It does sound like you may have a wheel bearing failing. Rotate the tires front to back and see if that changes the location of the...
2008 Ford Edge turned key on key off key on and displayed check brake system and went off but able to replicate every time
At key on, many dash warning lights will come on momentarily, and then turn off, as a system test as well as bulb check. If the brake warning light goes off immediately, that is normal. If you suspect a fault...

Related articles

A Buyer’s Guide to the 2012 Mercedes-Benz ML350 BlueTec
The The 2012 Mercedes-Benz ML350 BlueTec is a safe vehicle that offers many standard features such as solid wood accents, thick leather on the seats, and memory buttons to save your seating position. The ride is comfortable as it has...
A Buyer’s Guide to the 2012 Mercedes-Benz G-Class
Combining Combining rugged performance with an iconic boxy exterior style, the 2012 Mercedes-Benz G-Class is a hallmark of the SUV segment. It manages to combine true off-road capabilities with luxurious comfort and outstanding on-road performance in a way that most...
5 Comfortable Sports Cars Your Parents Won't Complain About Riding In
The most comfortable sports cars combine high performance with a smooth ride. Options include the Alpina B6, Audi S8 Plus, and Mercedes-AMG S65.