Replaces
Part Details
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Hi, I'm Don from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of 1AAuto.com. Thanks.
In this video, we're going to show you how to replace the spark plug on this 2003 Nissan Altima with the 2.5 liter, 4-cylinder engine. The items you'll need for this are new spark plugs from 1AAuto.com, 10mm socket and ratchet, 5mm Allen bit, and a 5/8 inch spark plug socket, as well as a gap tool.
To access the ignition coils, you first have to remove this engine cover. It's held in by these four 5mm Allen bolts. We'll just fast forward as Don removes these. Now, the cover just lifts right off. Here are your four ignition coils. It's held in with one 10mm bolt and the harness right here. Just push the tab and pull that harness off, and then remove that 10mm bolt. The ignition coil just lifts right up and out. With the ignition coil removed, you can see the spark plug right down in there. Using an extension and your 5/8 inch socket, you want to just remove that spark plug. If the plug doesn't come right out, then you can use a magnet or pliers to reach down and grab it.
You'll want to set the gap between the center electrode and the ground electrode. On this, it should be .044. Set it by sliding the spark plug tool in between there and make sure there's a little resistance when you pull it in and out.
Carefully, put the spark plug back down in and thread it in by hand to make sure you don't cross-thread it. Once it's seated, you want to tighten it between 18 and 20 foot pounds. Now, put your coil back down in and replace the 10mm bolt. You'll want to reconnect it and repeat these steps for the rest of the spark plugs.
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Tools used
Use a 5mm Allen key to remove the plastic engine cover. There are one, two, three, four bolts holding it on. Lift that off and put it aside.
These are your four ignition coils. I'm going to show you how to remove this one, procedure will be exactly the same for the other three. Start by pushing this clip in and wiggle the connector out. Use a 10mm socket and ratchet and use a retaining bolt. Put that bolt aside. Grab it on both sides, and kind of wiggle it, because there is a boot that goes down over the spark plug. It's got a little suction to it. Pull it out and that's how you remove the coil.
Your spark plugs are located down in the head through these access holes. Before you remove the spark plugs from the holes, to make sure there's no debris in there, if you've got access to compressed air with a blow gun, you should blow the holes and blow out any debris so you don't have any fall into the cylinder with the spark plug pulled out of there. These ones are actually pretty clean, so we're in good shape.
We can use a 5/8 spark plug socket. It has the little rubber holder in here that's going to grab onto the electrode end. It'll allow me to pull the spark plug out of the cylinder head once it's loose. We can just do these one at a time. Pull one out, replace it with the new one, move on down the line. Your old spark plug we pulled out, it's pretty dirty and sooty and it's got a bit of a fuel odor. The car actually had a check engine light for a random misfire. So it seems like it's time for a tune-up.
This is our new spark plug from 1AAuto.com. It is an exact match for the one that came out of the vehicle. It's ready to go and be installed. The electrode is nice and fresh and it's not worn out. This will really help the car out and basically be like driving a new car again.
Take our new spark plug, place it into the spark plug socket. That's why it has the little rubber holder in there so it doesn't fall out while you're trying to install it. Just going to install it by hand so it doesn't get cross threaded. Once I've swapped out all of them, I'll come back and torque these. Thread it down until it stops. Move to the next one. With the plugs threaded in just hand-tight until they stopped, I'll now torque them. The torque is 15 to 21 foot-pounds. I'm going to set my torque wrench at 17. We'll torque them down.
This bolt hole is just a metal insert into this plastic valve cover, so we're not going to over-tighten those. We'll tighten them very carefully so slide the coil down, push it over the spark plug, and let it sit in there. Get the bolt started. Just using my wrist to tighten it. Right when I feel it get tight, I'm going to stop because I don't want to pull the serrated insert out of the plastic valve cover.
Reinstall the connector, and repeat this procedure for the rest of the coils. Reinstall the engine cover, reinstall your four bolts. These bolts are just going into aluminum, just holding on a plastic cover. Not a lot of torque on these. Job is complete.
Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.
