ok so i have an 06 evo ix with 5000 miles. yesterday i decided to pull my plugs and do a compression test. I pulled all 4 plugs and found that 3 of them were cracked at the porcelin(spell check). now this could have happend somehow in the engine or from the spark plug socket i used, btw these are the plugs that came with the car, never changed. so i couldnt get ahold of any plugs last night so i left it at the shop i was at. Today i went to the shop with a new set of plugs(the same ones mitsubishi uses for the ix). i put the plugs in and fired it up, it started fine but then quickly dropped to low rpms and was misfiring, we heard a click from the engine a few times and shut it off right away. after talking about what it could have been we started it back up and let it run, the clicking was gone but the car was misfiring and almost stalling for a while, and then it got to a good idle and seemed to be running fine. we started reving it up a little and it started misfirng again and then stalled and through a code for misfire i think po300. took the plugs out to find they were all cracked, i did the compression test and it went 140,140,145,146(car wasnt fully warmed up and i didnt touch the throttle). now before i even touched the plugs yesterday the car was running perfect. now with the new set of plugs it went down hill. i will be going with another set of plugs tomorow and try it again. any suggestions, mods are in my sig if that effects anything. please help!

 

Try using a different spark plug socket and be gentle.

Good luck.

 

one more thing to mention...the plug was not gapped...just taken out of the box and put into the car, if that helps.

is it possible for the engine to somehow break all 4 plugs or is it most likely the tool

 

I don't think your engine broke your plugs, and furthermore I'm jealous of your IX.

 

im jealous too. did you gap them yet? if so, how did it run?

 

well if u could here it now u wouldnt want it...although i kno the engine is fine, i am clueless as to why putting brand new plugs would make the car misfire and stall and overall just run like crap...PLEASE HELP SOMEBODY!!

 

i will be putting another set in tomorow and gapping them if i need to, i just dont kno if im supposed to...the plugs are iridium ngk-5245...they are probably pre gapped but the gapping is the only thing i can think of that would cause the problems

 

first make sure they are the original plugs compare them to your owners manual! also what type of tool are you using to put them in?

 

the ngk 5245 was the original plug in the car?

 

Why are you messing with a car that has 5000miles. I would just take it to the Stealership.

 

these were the same plugs as the stock ones....matched up and everything....the tool used was a basic spark plug deep socket with a rubber piece inside...

wrxkila..
why even reply, thats no help to me at all, im "messing" with the car at 5000 just to make sure things are running right. had i known that changing spark plugs would cause these problems you think i would have done this?

 

[Stealership

lol

you funny

 

when you put the plugs on the tool do they cover the porcelin area?? it shouldnt cover that area!

 

yea it does but that same too was used to change plugs on an viii with no problems

 

there is a slight possibility that a piece of porcelin fell into the cylinder when i first took out the broken plug, i highly doubt it, but this would explain the noise we heard when it started up. could have been the piece moving in the cylinder and it stopped becuase it was released through an exhaust valve