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Topic
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05′ Neon SXT
On the way to an out of town account a few days ago on the highway my #2 spark plug came out. Pulled over put it back in no issues. Went back to the out of town account last night drove up there and back just fine. Parked outside my in town account came back up to hear banging under the hood when I started the car and sure enough the #2 had came back out. Threads on plug seem to be fine and it seems to thread in just fine as well. Honestly not a lot I can think of that would cause this unless it completly blows out the threads unless some of the vibrations from AT or rear mount is causing it to comes loose (something I highly doubt, but still a possibility in my book). Seems to only be doing this when I push to speeds of over 65 mph on highway.
Recent repairs are ECU replacement, upper and lower motor mounts. Spark plugs were replaced earlier this year when I purchased the vehicle.
Suggestions?
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Replies
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The only thing that holds the spark plugs in is the threads on the spark plug and in the cylinder head.
The threads in the head will need to be repaired with a thread insert such as a Helicoil or a Timesert.You will need the appropriate kit and someone with the knowledge to repair it.
Make sure you go to a decent place because at the very least they are going to have to re thread the cylinder head. More then likely drill and put in a insert like wysetech is saying that means metal shavings in the cylinder and they are not easy to get out.
There is also a slight possibility you are not getting it tight enough or you have excessive exhaust back pressure but, 95% chance it is the threads. Though if you over tighten it you can make it worse so….
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