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  #1  
Old 03-17-2009, 03:58 PM
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Default motor / spark plug help needed.

So, my 02 nissan sentra spec-v started to get a little bit of a mis-fire in it when i first started up. it's got worse today with it finally pulling a code, being mis-fire cyl #4. so, seeing how i have 91k on this car, first thing that comes to mind is a tuneup. start to pull plugs out, and #2 is all but stuck in there. much tighter than the others, and as i try to loosen it, it started to make some odd noises. witch after hearing that, i stopped before doing any damage to the head. so, questions to you guys.

A) how best to get that bastard out without and damage to motor?

B) should i replace all the coil packs. this car has one per cyl right above the valve cover.
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Old 03-17-2009, 04:31 PM
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what kind of weird noise?
have you ever replaced them before?
and you coil pack should be fine
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Old 03-17-2009, 04:38 PM
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more of a crackling noise. no, i've never changed them.
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Old 03-17-2009, 04:40 PM
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Coil packs usually last a very long time. IF indeed it is a coil pack, just buy one. They can be a little expensive. Put the new coil pack on the cylinder thats missing, and see if it corrects the problem. If not (after all the plugs are changed) Switch to another cylinder. (100+ ea) If the plug is seized, a little PB Blaster will help some. If it is cross threaded, you are screwed to be quite honest, I would think that it is not however as they are probably factory plugs. The sound may just be the washer grinding, and a little more force SHOULD break it loose. I would refrain from using a breaker bar however. If it is cross threaded a machine shop will have to repair the head, and inset a sleeve. Not cheap. If it comes out cross threaded, be sure not to let any bits of metal go into the head. Good luck man, I hope this helps.
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Old 03-17-2009, 05:13 PM
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You also may want to try with the engine hot, as metal is very reactive to temperature. Some kits are made to rethread the hole at home from what I can gather.... Try to tighten the plug, see if it moves.... if it does, spray some more lube on it and back it out... In out in out in out.... it should eventually break free.
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Old 03-17-2009, 05:16 PM
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will do. i'm going to get some plugs tomarrow and if i get a chance, change them out in the evening.
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Old 03-17-2009, 05:17 PM
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does it rain alot where you live it may have a little rust on it hit it with a penetrating oil and leave it for a day (or night)
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Old 03-17-2009, 05:21 PM
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I would first try on a hot engine. I know it sucks, but the heat may loosen the threads. Im sure you have alloy heads. Either diesel or pb blaster or plusgas will get into the threads. Diesel is a old school trick. You may even want to use a fixed 5/8ths or 3/4 socket and untighten it untill it stops and then carefully tap the shandle with a mallet. The shock of force may be enough to break it loose. That is generally better than just pulling hard as f**k, as there is less chance of shearing the tip off. Good luck man, and happy birthday.
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Old 03-17-2009, 05:36 PM
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Quote:
Originally Posted by wenn_du_weinst View Post
does it rain alot where you live it may have a little rust on it hit it with a penetrating oil and leave it for a day (or night)
it's indiana, we have a little of everything.
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Originally Posted by toyota thundra View Post
I would first try on a hot engine. I know it sucks, but the heat may loosen the threads. Im sure you have alloy heads. Either diesel or pb blaster or plusgas will get into the threads. Diesel is a old school trick. You may even want to use a fixed 5/8ths or 3/4 socket and untighten it untill it stops and then carefully tap the shandle with a mallet. The shock of force may be enough to break it loose. That is generally better than just pulling hard as f**k, as there is less chance of shearing the tip off. Good luck man, and happy birthday.
i maybe brought it a 16th of a turn. nothing much, as i started to hear that noise i stopped before i really messed something up. i think i got some WD at home. i left the shroud over the head off. so i'll start spraying it tonight.
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Old 03-17-2009, 10:31 PM
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I think they should put steel helicoils in anything made of aluminum because aluminum messes up so easy....

But what I would do before buying a coil pack is to just switch it to another cylinder after putting in the new plugs (don't buy the most expensive ones, the copper core works just as good) and see if the misfire moves with the coil. 99% of the time you can not return an electronic part if it has been installed.



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