Bad coil

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thebaum

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I have a 2002 V8 with about 116,000 miles. Recently started having problems that I am about 95% sure is do to the common coil problem after reading on this forum. Just looking for a bit of advice.
It am trying to avoid spending big bucks on this repair. I understand that there really isnt any way to determine which coil is bad without taking it all apart and seeing IF there is oil in one of them. There are no codes to check. It looks like my options for the coils are either motorcraft/bwd for around $45 a piece or some evan-fischer brand for around $10 a piece. anyone have experience with these cheap ones from amazon?

I read on here at one point that changing the boot only will fix 90% of the problems. Is this true? Can anyone vouch for this? I just dont want to take it all apart change the boot and plugs and then have to do it all over again!

Any help or advice will be much appreciated, thanks
 
You need to change the sparkplug at the same time you change the coil or boot as the plug probably has arc tracking. I've had bad boots on plugs that didn't have oil in the well. I'm the one who has been posting to change the plug and boot to fix misfires, and I've had several misfires cured by changing the boot and plug.
 
Bad COPs again, two options,

1) Replace only the one intermittent misfiring COP with a cheap no-name brand and chance that you'll be redoing it within the month.

or ...

2) Re&Re all COPs and plugs with OEM, ensuring connectors click properly and be done with it.


It's a slight expensive repair when said and done, going with 8X the OEM Motorcrafts but once they are in it will run tops again.

Another option is to run the Accel coils with the custom bolt downs, you'll have to reverse the polarity on the coil wiring at the
connector and because they are taller COPs, you'll have to run without coil covers, they seat tight but you'd have to make sure
to keep the underhood dry and ensure the hood seal to engine compartment at the windshield is in good shape at all times.
( a few members run with the Accel coils and no coil covers and have no problems with it from what I've read )

It's totally up to you if you want to put anything other than OEM parts in your LS of course, however Murphy's law ...

Best of luck with the repair, it's not all that difficult, couple small bolts in tight places that's about it.

NOTE: ensure the COP connectors click in position correctly and firmly.
 
Thanks for yalls help. I really dont want to put the cheap cops in my car for the stated reasons. I am going to go over my budget and see if I can do all of them now. If not, I might just try the boots at this time as that is significantly cheaper.
Thanks again guys.
 
another option is get the advance auto parts/ autozone one and get the 20% off on the coils and spark plugs, the reason I say that is they give you a 2 year warranty on them and if they fail just replace them under warranty. the coils will fail its a design issue with them so if you are going with the motorcraft ones then get the dg526 ones does are the latest ones and the best ones. also are you getting any codes how do you know your misfiring.
 
chocolat1701 said:
...they give you a 2 year warranty on them and if they fail just replace them under warranty. ...
Click to expand...

Has anyone actually taken them up on this and had them replace coils under warranty? The LS coils don't usually fail completely. Instead, they become marginal. Marginal coils will still test out as being good, even though they misfire on the car.

Also, all of my coils that have failed (become marginal) were dry, no oil or water on them.
 
chocolat1701 said:
also are you getting any codes how do you know your misfiring.
Click to expand...
No I am not getting any codes. The symptoms that im experiencing are exactly like many of those described here as COPs failing.

joegr said:
Has anyone actually taken them up on this and had them replace coils under warranty? The LS coils don't usually fail completely. Instead, they become marginal. Marginal coils will still test out as being good, even though they misfire on the car.

Also, all of my coils that have failed (become marginal) were dry, no oil or water on them.
Click to expand...
Thats actually a good point. So having a warranty wont necessarily help. How can i tell which coil is bad? Is there anyway to tell without replacing them all?
 
I have a couple of COP's from Advance, and though I've never had to replace them (did change the boots once), I believe they are lifetime replacement.
 
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