C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Stuck plugs

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Old Jun 29, 2011 | 05:36 PM
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Default Stuck plugs

Ok this may sound stupid but I was given a 1986 corvette with 58000 miles on it. I guess I got one of the last off of the production line because it has aluminum heads. My question is I was going to check the plugs but it looks like they have never been changed and are so tight I am somewhat leery about using to much force to loosen them. Any suggestions would be welcome.

Thanks in advance for any help
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Old Jun 29, 2011 | 06:01 PM
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soak w/pb blaster, try to slightly tighten them first, sometimes it breaks things loose with out breaking things.
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Old Jun 29, 2011 | 06:09 PM
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Thanks I will try it. The car runs ok but I know it must need plugs they are 25 years old haha.
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Old Jun 29, 2011 | 08:56 PM
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After soaking with PB Blaster when the engine is cold soak each plug with a fast evaporating contact cleaner. The cold produced by the CC might "shrink" the plug threads enough to break them loose.
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Old Jun 29, 2011 | 09:40 PM
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Be sure you only go to take out the plugs when the engine is cold, otherwise you may strip the threads on the alum head.
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Old Jun 29, 2011 | 09:52 PM
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Try this- Start the car and let run for around 2 or 3 minutes. Then remove plug wires and remove the plugs. It is easiest to remove the plugs, especially on the passenger side, by removing the splash shield. It is also a good idea to use an extension and a universal when removing and installing the plugs, that will assist in getting the plugs threaded back in correctly.
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Old Jun 29, 2011 | 10:16 PM
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Change the ones that come out easy. Leave the others until you are up for a major project.
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Old Jun 29, 2011 | 11:15 PM
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Originally Posted by JackDidley
Change the ones that come out easy. Leave the others until you are up for a major project.
You don't want to create a problem if the car is running fine.
If it were me, I would leave the plugs alone. Save your energy for fixing something when its actually broken. You will have plenty of opportunities.

Last edited by Sidney004; Jun 29, 2011 at 11:17 PM.
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Old Jun 29, 2011 | 11:17 PM
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Totally agree on removing the splash guard (passenger side).

The one thing I found really helpful was I bought a plug socket that is on a swivel. It allows the drive socket to get up in the right angle and seat on to the plug. Made a huge difference....good luck!

http://shop.advanceautoparts.com/web...T|GRP2062_____
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