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Re: how do you change the spark plugs
The only thing you need is the appropriate plug socket extension bar and ratchet handle.Undo and remove/replace one plug at a time so you dont get the h/t leads mixed up Also when removing the h/t leads remove with a twisting motion they will be tight but keep twisting as you pull and they will come off.Be as gentle as possible with the h/t leads as they are quite fragile.When you buy the plugs ask the store to make sure the spark plug gap is right for your vehicle as there are some variations.Good luck and good on ya for not being ripped off and doing it yourself!
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depending on what engine you have, the labor is 1.6 for the 3.0 v6 and 2.2 for the 3.5 v6. assume most shops charge $90 a hour for labor plus tax you're lookig at between 170 and 200 just for labor then plugs from mitsubishi are $13.73 retail, but aftermarket platinum plugs are a lot less, like $8 each. so depending on what plugs between 35 and 85. so unless you are wanting to do it yourself you are looking at between 200-250 for the 3.0 v6 or 230-290 for the 3.5 v6. if you are local i woudl do the job for way less : )
I would change all 4 spark plugs if you gonna change just 2 no added cost , labor i would say no more then 1 hour, parts different costs in different parts of the country try your local parts store , MAKE SURE though you get bosch plugs back in this car.
Not to put firestone down but how intricate was this diagnostic that they preformed? It sounds like they just plugged into the OBD2 port and looked for any codes in the history. You may be right, it may have to do with temperature. But I'm thinking more in the respect of a faulty sensor that is changing with temperature. That is, if it has to do with that. The other thing is the fuel-pump. Has it been tested? If possible, When this no start situation occurs, investigate it. Find out if you have a no-spark or no-fuel situation.
remove the bettery on the left side of car on the right side of car remove washer bottle remove spark plug wires and take of your spark plugs ( not an easy process hard to get to frame rail in the way)
it could be the spark plugs, at least that is what it was for mine, if you have over 50k miles without a spark plug change i highly suggest one, also a oil /transmission change would be great for your car too if you haven't done those reciently. I would also suggest using a higher grade gas, sometimes this fixes the trick too.
If you try all those and still experiencing hard transitions please let me know and i'll try a more indepth analysis on your car.