mstrspy

My 98 Crown Vic started to Mis fire today. Got a check engine light. I
remember reading that the coils start to break down after 100,000
miles. I jigggled the coil caps a little and found that I could get
the misfire to stop. I disconnected the battery for 5 minutes to
clear the check engine light. Is there a sure way to check these coils
rather than replacing them all? They cost about $60.00 each. Each plug
has a coil on top of it.

M

 

eastwardbound2003@yahoo.com

When the computer diagnostic codes are pulled it might turn up
something like "Misfire in cylinder #5" or so.

Best not jump to conclusions. Even a loose spark plug can cause this.
It could be a bad spark plug, bad plug wire, or a bad connection
between the spark plug and the coil.

johanb

Most of the time it are the boots on the coil packs that are going bad.

Pull the coil pack and sparkplugs and look for carbon tracks, moisture or
cracked boots

Offcourse @ 100K it wouldnt hurt to replace all plugs and boots anyway

"mstrspy" <blank@verizon.net> wrote in message
news:gqjjs1h7fu31cga1cunpih8k6679bj4mm3@4ax.com...
> My 98 Crown Vic started to Mis fire today. Got a check engine light. I
> remember reading that the coils start to break down after 100,000
> miles. I jigggled the coil caps a little and found that I could get
> the misfire to stop. I disconnected the battery for 5 minutes to
> clear the check engine light. Is there a sure way to check these coils
> rather than replacing them all? They cost about $60.00 each. Each plug
> has a coil on top of it.
>
> M
>
>

chuckster

After I tried looking for tracking, and diagnostic code checking, I got
frustrated and changed ALL the coil packs at 89K. and it was the best
thing I have done to the Vic. it runs better than new since the change
out. Yes they are expensive, (8cyls.x$60) but I have found no way to
check these, and yes they do go bad. If you want to "cheap out" just
try changing the boots only, and maybe you will get lucky. If you
decide to install new packs, make sure you install new plugs, this is
an easy job and should take no more than one hour. These packs are
exposed to alot of heat and I feel Ford did a poor job at locating them
where they did. Good Luck.