Postby smj999smj » Wed Nov 25, 2015 7:11 pm
I'm not sure what you mean by "fail more gradual." To me a "failure" is when the spark plug has a manufacturer defect, as oppose to a plug that is simply worn out because they have been used past its recommended service interval. Having worked 16 years for Nissan as a tech along with a number of years working for other shops, I have replaced an awful lot of NGK spark plugs and have only found one that actually "failed." It was a 95 Maxima and it was misfiring; it turned out the porcelain was cracked. I recall once working on a Mercury Villager with the Nissan VG engine and it had the original 30,000 mile NGK copper plugs in it at 148,000 miles and was still running well, albeit VERY worn (you could tell the original plugs on these as they were imprinted with both "NGK" and "Motorcraft" on them).
NGK makes the AC Delco iridium spark plugs and they have 120,000 mile service intervals on them, which is why I say, based on that fact and seeing what my plugs were like on my 08 Pathy, that they would probably have no problem going 120,000 miles on the NGK OE Laser Iridiums.
NGK G-Platinums, as are Iridium IX plugs, are NGK's economy line of platinum and iridium plugs, respectively, and to my knowledge do not come as original equipment on any vehicle. They are single platinum or iridium plugs that have a service interval of 60,000 miles.
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2012 Infiniti G37 - Spark Plug
Material Grade: Double Platinum
Hex Size (in): 9/16 Inch
Hex Size (mm): 14mm
Center Electrode Design: Fine Wire
Thread Reach (in): 1.043 Inch
Thread Reach (mm): 26.5mm
Number Of Ground Electrodes: 1
Preset Gap (in): 0.039 Inch
Preset Gap (mm): 1mm
Short Style Spark Plug: No
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Infiniti G37 IPL Spark Plug
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How to Change Spark Plugs on Nissan Infiniti V6 3.5L Engine
What you will need
Park the Nissan on level ground. Turn off the ignition and set the parking brakes.
Allow your engine to cool down for at least thirty minutes.
- Pull the hood release on your Nissan and open the hood.
- Locate the battery in the engine bay. Disconnect the negative battery terminal.
Remove the 10mm bolts on top of the engine cover. Remove the engine cover. If no bolts are present, the cover can be removed simply by lifting it.
Remove Ignition Coils. Unplug the electrical connector from the ignition coil. Press the small tab, then pull. Do this for all three front coils.
- Remove the 10mm bolts that secure the coil in place. Pull the coils out.
- This engine also has three coils hidden under the intake manifold. To replace those spark plugs, remove the intake manifold by removing the 10mm bolts that hold it in place. Disconnect the air intake from the manifold. Remove any hoses and pull out the intake manifold.
Use the spark plug socket, extension, and ratchet to remove the spark plugs from your Nissan. Use a magnetic pickup tool to pull out the spark plugs.
Install new spark plugs. Use anti-seize on the spark plug threads. Install new spark plugs by hand on your Nissan until they are finger-tight. Then use a ratchet to tighten an additional 1/4-1/2 turn. Ideally, use a torque wrench to tighten the spark plugs. Typical torque values are 10 to 15 lb-ft for 14mm threads and 15 to 20 lb-ft for 18mm plugs. Standard spark plugs should be gapped to 0.043.
Install Ignition Coils. Reinstall coils by pressing them firmly on the spark plug. Tighten the 10mm bolt.
- Ensure the connectors don't get mixed as they need to be in the same coil as before removal.
- Start the car. Reinstall the engine cover. Reconnect the negative battery terminal. Remove any tools from the engine bay and start the car.
Typical torque values are 10 to 15 lb-ft for 14mm threads and 15 to 20 lb-ft for 18mm plugs. Standard spark plugs should be gapped to 0.043.
Spark Plug Gap
Most spark plugs come pre-gapped and do not require gapping. Check your owner's manual.
Nissan recommends that you replace the spark plugs every 105,000 miles. This recommendation can vary if you have iridium, platinum, or standard spark plugs.
What if I don't replace my Nissan spark plugs on time?
This is a list of issues you may notice if you don't replace the spark plugs at the recommended interval.
- Check Engine Light On
- Fault Codes: P0300 P0301 P0302 P0303 P0304 P0305 P0306
- Engine Misfire
- Poor Fuel Economy
- Engine Shaking
Plug torque spark g37
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