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Second Generation Legend (1991-1995)

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Old 10-20-07, 10:35 AM   #1 (permalink)
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Bad Coil Packs

how do you determine of you have a bad coil pack??
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Old 10-20-07, 01:03 PM   #2 (permalink)
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i'd like to know as well but if i took a guess i would say some type of sluggish responsiveness from the car, misfiring of some sort. i dont know how u can diagnose this for sure tho
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Old 10-20-07, 01:20 PM   #3 (permalink)
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a good way to see is, unplug the coil pack and see for a change in RPMs or just change in the way the engine runs, based on pulling other coil packs. 1 at a time. this is often referred to as a "power balance test"

U can also try a known good coil pack and see how the car runs

or if u have a ohm meter, u can test the resistance in the coil.
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Old 10-20-07, 03:39 PM   #4 (permalink)
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Power balance test huh. I'm going to try this. Unplug one by one and if I notice a change then it's bad? Good?
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Old 10-20-07, 04:22 PM   #5 (permalink)
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if the change is different in a paticular cylinder then tehre is a issue in that cylinder. It can possibly be the coilpack. it could also be a faulty injector or sparkplug, etc. it just pin point a problem with the cylinder.

once u do find the cylinder, if u swap coil pack with another cylinder and then see what happens. if the problem follows the coil pack, its a coil pack issue.
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Old 10-20-07, 07:57 PM   #6 (permalink)
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Quote:
Originally Posted by Alperovich View Post
a good way to see is, unplug the coil pack and see for a change in RPMs or just change in the way the engine runs, based on pulling other coil packs. 1 at a time. this is often referred to as a "power balance test"

U can also try a known good coil pack and see how the car runs

or if u have a ohm meter, u can test the resistance in the coil.

i was going to mention this but if u unplug a coil wouldnt u notice a change anyway regardless if its good or not? cus u would be cutting off the spark being supplied to the engine...right?
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Old 10-21-07, 01:49 AM   #7 (permalink)
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yes, the idea is that, if its not firing right in the first place, it will only slightly run worse, sometimes nothing will change. your looking to make sure, if its working properly, you'll see a sudden and noticeable change in how the motor runs. if the cylinder wasn't running alright, then it wouldn't change much or at least not like the others.
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Old 10-21-07, 02:46 AM   #8 (permalink)
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idk...but i did this to make sure my cylinders were firing and they sure were (after i changed my plugs) but idk if i still need coils or not. my car doesnt seem to pull like my 93L coupe and i have to hold the key for 1.5 seconds and at idle its kinda rought but only noticeable cus its me. what could this be...o and i also put oil stabilizer in the engine too with an oil change so what gives? nothing different b4 tune up or after
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Old 10-22-07, 11:45 AM   #9 (permalink)
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/\ have u checked your fuel pressure? it might be causing something

also, my 93 coupe, most of the time i have to crank it a little longer, idk why.
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Old 10-22-07, 04:25 PM   #10 (permalink)
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Quote:
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how do you determine of you have a bad coil pack??
i have six coil packs. i think one or two is bad.
i can lend them to you so you can use it to check if yours are bad.

pull one coil from your car and put one of mine in replacement and start your car. if there is no change then the coil you pulled out isn't bad. do this one coil at a time until you find the bad coil. once you find the bad coil/s, simply note which cylinder/s and buy your own and send my coils back the way you got them...just pay for the shipping.
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Old 10-22-07, 05:20 PM   #11 (permalink)
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I just swapped out 4 of my 6 coils (don't know which was bad though )
I will sell them very cheap if you want to try them.
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Old 10-22-07, 05:27 PM   #12 (permalink)
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Check the inside of this connector in the midlle of picture, it is the positive conection to all coil packs.

If you go to a shop they can measure your exhaust fumes, keyword here is to look for unburned fuel (parts HC).

If you drive like this too long the O2 sensor will go bad....
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Old 10-23-07, 06:21 AM   #13 (permalink)
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hey i'd like to try this how much is shipping? and alperovich what way iis there to check the fuel pressure? once ur car warms up on ur 93 coupe does it start with no delay?
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