Q: Only found 3 spark plugs on top of engine

asked by on

Where is the 4th spark plug?

You may have to just measure the distance from one spark plug hole to the next and find the lost hole. There are all about 3 inches away from each other and accesed from the top of the engine.

Was this answer helpful?

Look on top of the engine and you will see 4 ignition coils. Directly under each coil in the tubes through the valve cover is where the spark plugs are placed. Remove all 4 coils and look down the tubes with a flashlight and you will see all the spark plugs. If you are unable to see the spark plug but you see a lot of black stuff, then the valve cover is leaking at the top of the tube causing oil to drip down on top of the spark plug. You would need to use a pump to suck out the oil before removing the spark plug so the exhaust system does not get coated with oil as the oil will go into the cylinder. If you need further assistance with your spark plugs being visible, then seek out a professional, such as one from Your Mechanic, to help you.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Only found 3 spark plugs on top of engine

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: Transmission is missing output shaft speed sensor port

The problem in performing a bypass is it is illegal in all jurisdictions to bypass, or modify, any vehicle component for the express purpose of defeating mandated emissions testing. If the output shaft in the two transmissions is identical (including...

Q: Vibrates with acceleration just spent 900 on shocks struts suspension repair & 300 brand new tires

Hi Cat. Thanks for contacting us today. I'm sorry to read about these constant problems you're experiencing with the Toyota Corolla. In most cases, a vibration like you're describing is caused by a steering or suspension component failure, or a...

Q: Engine Light On - System Too Lean.

Hi there. Check the mass air flow sensor (MAF) and see if it got unplugged. When the oil change was done, most likely the air filter was checked and the MAF sensor was disturbed. Also, check all of the vacuum...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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...