# Spark Plug Change

**URL:** <https://forums.speedlife.net/t/spark-plug-change/148471>\
**Category:** Canada Nissan Automotive\
**Created:** [February 1, 2008, 7:09pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471 "2008-02-01T19:09:09Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![simpsonc](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@simpsonc](https://forums.speedlife.net/u/simpsonc)\
**Post date:** [February 1, 2008, 7:09pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/1 "2008-02-01T19:09:09Z")

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ok so today i changed my spark plugs and when i was done i started up the car and it ran fine and then i rev’d the car a bit and then the car started to spudder and then when i looked under the hood the cap to the 4th spark plug is loose. So i turned off the car and then put the cap back on and then started the car up and it did the exact same thing. Does anyone know why the cap comes loose from reving the engine?

thanks  
chad

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**Author:** ![simpsonc](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@simpsonc](https://forums.speedlife.net/u/simpsonc)\
**Post date:** [February 1, 2008, 7:12pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/2 "2008-02-01T19:12:54Z")

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car: 92 240sx

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**Author:** ![DatsunDave](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/datsundave/32/5805_2.png) [@DatsunDave](https://forums.speedlife.net/u/DatsunDave)\
**Post date:** [February 1, 2008, 8:25pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/3 "2008-02-01T20:25:06Z")

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Cap? Are you talking about the lead / boot that attaches to the top of the spark plug? The end may just be crap and needs to be replaced. Under low revs it doesn’t come loose. Rev it up and POP?

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**Author:** ![simpsonc](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@simpsonc](https://forums.speedlife.net/u/simpsonc)\
**Post date:** [February 1, 2008, 8:29pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/4 "2008-02-01T20:29:55Z")

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yes the boot, its fine when it idles and all that but then when i rev the engine it like pops off, but i cant think why it would do this?

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**Author:** ![DatsunDave](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/datsundave/32/5805_2.png) [@DatsunDave](https://forums.speedlife.net/u/DatsunDave)\
**Post date:** [February 1, 2008, 8:51pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/5 "2008-02-01T20:51:05Z")

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…likely because the metal connection within the boot is worn.

It is secure enough at idle but when you rev it up there is more engine movement and obviously more voltage.

Start with an unhooked battery then get a screwdriver in there and bend the metal clippy thing so it grips the top of the spark plug tighter. Try that. If that doesn’t work, replace it.

By the way, I would replace it anyway but just try the bending thing first.

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**Author:** ![simpsonc](https://avatars.discourse-cdn.com/v4/letter/s/f0a364/32.png) [@simpsonc](https://forums.speedlife.net/u/simpsonc)\
**Post date:** [February 1, 2008, 9:48pm UTC](https://forums.speedlife.net/t/spark-plug-change/148471/6 "2008-02-01T21:48:23Z")

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ok well i havent done any of that but i just took it out and put it back and just did that like 3 times and then i went for a drive and came back and it was fine and rev’d the engine and its staying in. well see how long it lasts for lol 😛