- Joined
- Jun 8, 2022
- Messages
- 5,566
Changed plugs tonight. My VQ40 just rolled past 170K. I changed them the first time early around 70K. Factory spec is 105K miles. These are factory spec NGK Iridium plugs. Same thing went back in - purchased from RA.
One of the boots came out broken. I have had this issue before. There is one plug directly under the intake manifold, Nissan says to remove the manifold, but I have now done this 5 times on VQ40's without removing the manifold - but it seems this is the risk you run. Strangely this one never had a misfire. I checked the misfire logs in torque pro recently - none - so its not that its not misfiring infrequently - there were literally zero logged on that cylinder. Another cylinder actually had a couple - which still isn't a big deal. Guess I got lucky. Replaced the boot - I have a couple spares.
One of the boots came out broken. I have had this issue before. There is one plug directly under the intake manifold, Nissan says to remove the manifold, but I have now done this 5 times on VQ40's without removing the manifold - but it seems this is the risk you run. Strangely this one never had a misfire. I checked the misfire logs in torque pro recently - none - so its not that its not misfiring infrequently - there were literally zero logged on that cylinder. Another cylinder actually had a couple - which still isn't a big deal. Guess I got lucky. Replaced the boot - I have a couple spares.