Introduction: Replacing Spark Plugs!

Time to replace worn spark plugs! I bought iridium plugs for longer lifespan and better fuel economy.

Step 1: Remove the Cowling.

On most vehicles there is a cowling to protect the plugs. This one had 3 Phillips head screws to remove plus the engine oil cap.

Step 2: Assemble the Spark Plug Spanner!

I used a heavy duty 1/2inch drive and spark plug deep socket to remove and install the plugs. The extension bar is specifically for getting at spark plugs since it allows for a wobble with the socket.

Step 3: Remove the Plugs.

The driver bar makes it really easy to remove the old plugs.

Step 4: Stupid Design by Kia.

Two of the plugs were blocked by a wire harness. I don't know why engine designers do this crap for. Very very stupid design.

Step 5: Comparing Old and New.

The copper plug has a fat tip whereas the iridium has a narrow tip.

Step 6: Install the New Plugs and Complete the Job.

Installation is the reverse of removal. Tightening of the new plugs should be done with a torque wrench, or in the absence of one, just dont arm wrestle the plug!

Now the car runs a bit better and has improved fuel economy.

Comments

author
dylpit made it! (author)2015-05-03

You should also gap the plugs. Don't assume they are gapped to your car.

I tried those iridium plugs in my car with no change in gas mileage. Sometimes just replacing worn stuff will improve mileage over non-OEM recommended parts. Think dirty vs clean plugs.

author
Mjtrinihobby made it! (author)Mjtrinihobby2015-08-04

Iridium is too brittle to risk gaping those plugs. Other electrode materials then sure but I don't chance it with Iridium.

author
YouNeverKnowItUntil made it! (author)2015-08-04

You forgot one thing: let the engine cool down before you take out the spark plugs or you'll have to get it re-threaded which will not be fun

author
LeChef made it! (author)2015-05-07

Great basic tutorial for changing spark plugs. Tip: don't forget to put a small amount of copper grease on the spark plug thread. It will make the loosening the plugs much easier!

author
Mjtrinihobby made it! (author)Mjtrinihobby2015-05-07

My last bit of that I used when replacing some heated oxygen sensors. I will need more of that good stuff since I'm gonna replace my civic exhaust manifold with a performance header. Will post that instructable in the next month or so!

author
rspellicer made it! (author)2015-05-03

Ditto on the anti-seize, especially if your engine has aluminum heads. Use permatex copper anti-seize or the like. Also, changing plugs while engine is hot, especially with aluminum heads, is a bad thing; the threads on the heads can wear out prematurely. Lastly, torque wrench would be nice. I never did like the old way of just snugging up the plugs. You want it tight enough to seal, but do not want threads on heads to get damaged. A torque wrench will make the job consistent.

author
seamster made it! (author)2015-05-03

Nice work!

I've also scratched my head at some of the design considerations in the engine compartments of my vehicles... "why did they put that thing right there!?" :)

author
Mjtrinihobby made it! (author)Mjtrinihobby2015-05-03

Thanks Man!

author
carlos66ba made it! (author)2015-05-03

Some mechanics recommend using anti seize grease on the threads. May make it easier to remove later.

author
Mjtrinihobby made it! (author)Mjtrinihobby2015-05-03

Yea true.

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