How to Replace a Spark Plug in a Car？

 How to Replace a Spark Plug in a Car？

1. Wait for Your Car Engine to Cool Down

Finding a spark plug that fits your vehicle is simple. What I do is go to the spark plugs page on Amazon and enter my vehicle year, make and model into their "filter by vehicle" search.

If you skip this step, you might find it impossible to remove the spark plugs from your engine without ruining the threads. This is especially true for aluminium cylinder heads. While it is possible to repair a misthreaded spark plug hole, but it is difficult and should be left to a professional.

2. Blow Out Debris Around Spark Plugs

Blow off any dust, dirt or debris around and near the spark plug with a compressed air duster. The last thing you'll want is foreign particles falling DIRECTLY into your engine and possibly causing premature engine wear.

3. Make Sure Spark Plugs are Screwed in Straight

If spark plugs go in crooked, they can cross thread and you will have a problem. To make sure my spark plugs are screwed in straight, I like to wiggle them a bit as I'm inserting them in. If you notice the spark plug getting tight right at the beginning... then stop, take it out and restarting the screwing process.

4. Change Spark Plugs One at a Time

It is VERY easy to get the wires all mixed up, so just play it safe and do them one by one. If you have a car with a coil-on-plug system then this is not as much of a worry. Also, most all newer cars make it hard to put parts in the wrong place, but you have to be more careful with most older cars.

What Does It Mean When Your Spark Plug Wells Are Filled with Oil?

I recently pulled out the spark plug wire and found there is engine oil in the plug well. This problem has me worried and I need advice. Is it a big problem I should get fixed right away?
Answer: Repair Oil Leaks Into the Spark Plug Wells As Soon As Possible

There is an O-ring that seals the spark plug well and keeps oil from leaking into it. As with any valve cover gasket, it will start to leak over time. Sometimes tightening the valve cover bolts will stop the leakage, but more often than not the valve cover gasket, and well seals, will need to be replaced.

The seals will come with the valve cover gasket set. I would get it fixed as soon as possible. The oil will cause the spark plug boot to swell and lead to a misfire. This will certainly hurt engine performance as well as a possible engine fire.

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