Discover how to change coil packs on a Mazda 3.0L. When changing coil packs on the Mazda 3.0L from 2004 to 2008, you will also want to change the spark plugs. This is suggested, because of how involved dismantling the upper plenum is.
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The life of the coil packs and plugs are approximately 100,000 miles. It wouldn't make sense to be this invested in tearing down the top of the motor, only change one part. Especially knowing, you will be revisiting this procedure again in a month or two. Always change parts out in Pairs or Sets.
Changing Coil Packs On A Mazda 3.0L - Step-By-Step
These are the step-by-step instructions on how to change coil packs, including spark plugs on a Mazda 3.0L. This covers the 2004 to 2008 Mazda 6 and MPV. However, this can apply to many Mazda vehicles in this year with this engine.
The thought on how to change coil packs on a Mazda 3.0L may seem intimidating. However, I can assure you, the job isn't as bad as it might seem. Often the DIY home-mechanic might feel a bit overwhelmed with the thought of pulling a plenum off.
Luckily, this task is simpler than you would think. The instructions below will guide you through the process and make this project a snap. If it is easier, there is a video lower in this article. See Video
Quick Steps
Step 1
Remove the plastic engine cover by loosening the (3) 10mm nuts. You will want to use a deep well socket.
Step 2
Pull the (3) hoses off from the back of the plenum. Two will take pliers to to squeeze the clamps on the hoses.
Step 3
Disconnect all the electrical connectors to the throttle body. Refer to the Video (2:14). You do not have to disconnect the electrical connector or the hose to the EGR Valve.
Step 4
Remove the (3) 8mm bolts to the EGR System Brackets to allow it to set aside, you do not have to remove it.
Step 5
Remove the (2) hoses from the Air Breather Tube and one from the Valve Body where the Tube connects to the Valve Body. Loosen the 10mm clamp bolt to the Air Breather Tube where it connects to the Valve Body and pull it back. Unfasten the Air Filter box top and remove the entire Air Breather Tube with the Breather Box Top.
Step 6
Disconnect the wiring harness retainer clips along the front site of the plenum. Refer to Video (5:38)
Step 7
Remove the (8) 10mm Plenum bolts and set the plenum off to the front side. No need to remove, it is flexible enough to move around to allow you to get to the coil packs and spark plugs.
Step 8
Remove the electrical connectors to the coil packs. Remove the 8mm bolt on each coil pack, then twist and pull upward to remove. Note: This would be a good time to replace the PCV Valve. See Video
Step 9
Using an air hose or canned air, blow the holes where the spark plugs are out to remove any dirt or debris that can fall down into the cylinder once the spark plug is removed. Remove the spark plugs.
Step 10
If Installing the new spark plugs. Gap your plugs first, they should be around .044in but some under hood stickers and manuals call for .052in. May want to check with you manual first. After you gap the plug, coat the threads of the plugs with anti-seize compound before installing.
Step 11
Push new coil packs onto the spark plugs. Place a dab of di-electric grease in the hole of the coil pack and spray silicone lubricant on the out boot of the coil pack first.
Step 12
Replace the (6) o-rings on the plenum with new ones. Wipe the surface that the plenum bolts to down with a solvent to remove dirt and oils.
Step 13
Bolt plenum back down, refer to torque specs and bolt pattern below.
Step 14
Reassemble everything in the reverse order.
How To Video
Plenum Torque Specs
6ft-lbs to 9ft-lbs
72in-lbs to 108in-lbs
Recommend using an Inch Pound torque Wrench at 95in-lbs to 100in-lbs
Plenum Torque Bolt Sequence
Firing Order And Cylinder Location
Tools And Materials
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