Coil packs
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New User
Joined: Oct 2007
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Coil packs
I have a 2001 Expy with 225,000 miles and just had #4 coil replaced a month ago. Now #8 is miss firing. In the past I have replaced 1 and 6. Do I need to replace all the others while we are doing #8 or is it just one of those things?
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
Your choice. You can either replace them all preemptively as an attempt at preventative maintenance or one at a time as they fail.
You'll get advocacy of each course of action but it will ultimately be your decision.
You'll get advocacy of each course of action but it will ultimately be your decision.
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
Agreed ^^^ and the other thing will be which brand to use. Reading here I've seen too many instances of aftermarket COP's failing, my own experience with Granatelli says stick with Motor Craft or Standard Motor Products. Prices have come down to about $45 each from the various online parts sellers, probably find a similar price in your local outlets too.
Over three different E250's I've bought used (2 with 200K + miles) there's not be a single COP failure----I strongly recommend OEM all the way!
Over three different E250's I've bought used (2 with 200K + miles) there's not be a single COP failure----I strongly recommend OEM all the way!
Cargo Master
Joined: Sep 2005
Posts: 2,978
Likes: 911
From: Montana
One thing to consider as well, is that more often than not, the COP itself has not failed, but the boot has rotten or torn, causing the spark to cross the tear into the exposed head instead of the plug, thus causing a misfire. Some auto parts stores carry the boot, which can be replaced alone (at about $5 apiece). Not always the case, but can be a much cheaper fix.
Fleet Owner
Joined: Aug 2010
Posts: 21,255
Likes: 1,657
From: Reynoldsburg, Ohio
One thing to consider as well, is that more often than not, the COP itself has not failed, but the boot has rotten or torn, causing the spark to cross the tear into the exposed head instead of the plug, thus causing a misfire. Some auto parts stores carry the boot, which can be replaced alone (at about $5 apiece). Not always the case, but can be a much cheaper fix.
Be sure to use a dab of dielectric grease in the plug and COP end, helps seal them.
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